a-lt--~f..~~~~~·;c.t
Transactions and Proceedingsof thePalaeontological Society of Japan
New SeriesNo. 23

Palaeontological Society of Japan
August 31, 1956

CONTENTS
TRANSACTIONS
Page

290.

Ycbisites, /1. New Lower Jurassic Ammonite from Japan ............ .
... ... ... ... ... ... ... ... ... ... ...

.. ............................... Tatsuro MATSUMoTo 205

291. Some Pliocene Otolith from Chiba Prefecture, Japan ...... Kotora HAT At 213
292. /1. New Species of Li11gula from Hokkaido. Japan. . ............................ .
... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... lchiro HAYASAKA and Kotora HAT AI 219
293.

On the Miocene Pectinidae from the Environs of Sendai;Part 8, On

PectetZ (Patitwpecte1t) kimurai motumori'ensis NAKAMURA .................... ..
... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...... ... ... ... ... ... ... ... ... ... Koichiro MASUDA 221
294.

On Some New Species of Rausere!la from Mt. Ibuki, Shiga Prefecture,
Central Japan. .. ................................................... Manabu KonA v Asm 225

295. A Fossil Fauna from the Northern Part of the Tanzawa Massif ......... .
... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ...... ... ... ... ... ... ... ... Matsutaro SHIBATA 229
296.

Neoschwagerininae from the Shima Peninsula, Japan .... Nobuo YAMAGIWA 235

297. An interesting New Form of the Aturidae from the Palaeogene ofNorthern Kyushu. ... ... ... ... ... ... ... ... ...

.. ................ Teiichi KcmAYASHI 243

PUBLICATIONS RECEIVED (15) ............ .

218

PROCEEDINGS ................................... .

246

President:

Hisakatsu YABE

Councillors:

Kiyoshi AsANo, Riuji ENDo

ENDO, Haruyoshi FuJIMOTo(Business and Accountant), Seido(Publication), Shoshiro HANZAWA, KotoraliATAt, lchiro HAYASAKA, Nobuo IKEBE, Teiichi KoBAYASJJI (Editor), Jiro
MAKIYAMA, Tatsuro MATSUMoTo, Masao MtNATo, Tokio SIIIKAMA, Fuyuji
TAKA! (General Affairs), Hisakatsu YABE.

All Communications relating to this Journal should be addressed to the
PALAEONTOLOGICAL SOCIETY OF JAPAN
Geological Institute, Faculty of Science, University of Tokyo, japan

Trans. Proc. Palaeont. Soc. japan, N. S., No. 23, pp. 205-212, Pl. SO. Aug. 31, 1956

290.

YEBISITES, A NEW LOWER JURASSIC AMMONITE
FROM JAPAN*
TATSURO MATSUMOTO
Department of Geology, Kyushu University8~Q);s. 7?lH'ffililf'iQ)~~~

5E[it.J;:. Alsatill's C. VC.

Yebisites:?i!i~:!"i'4tJl(i!IJlfjifi:Q).:<. :7*Q)"fZl\il·~lli-c.

1J 7, 1-l.:;!hlf~.tl,t.:;: C.Q);!j,~~Z. J:

11<l...~-"t.:o .:£-Q)M*.::tt.lt.:: !..I.: Yebisites ot~oderai C. t..
Arieiitaceae C. l.,.-C(t~LI.', ~Jilji¥.JQ) <V:tl.Z. ~'? 0 ~~ • i:1~ · JljJ
(t. Alsatites "'(" Ca/oceras Q).{-it.l.:ifi:{!1-e<f>~o IOOtiq:,lil~lt~'j'-e, Alsalites Q)~W!:i(l1).{­hC.!m-""CI1fJ:I.'7i:, Vermiceras t.r. cl:.~~-t~J:? t.r.i\'lfltt.r.
j;f.:IOOHiQ)IJlflJ.ftt~t.r.l.'o {:tJjjQ)jjjJQ)Jlljllll*~iJ:. ~ ~~t::> tJ'jijllnJ(t, Schlotheimids l.:iffi t.:-7.> t q:,tJ::!h 7.>iJ;, ftbl1)/t.f.-elt~
7i;? 0 *!IIU7t1J1*tiffC. L.-C(t. Psiloceratidae fj.I:J:IQ)llfif'!- Abatitinae i.:A.n7.>-"~ ~Q)-e:1;,7.> 0
4'!114t.s:ffl:~'k' ~ ~. ~llJt'k'fti&-t ~ ~ Q)"'C;!j,~.:. C. tJ:·hiJ•"?t.:o"C:le~i"~o fjfflj!,(t.

<,.:: q:,1~1:il1)ilfii±IRl/~lt. ;g~JIIJ\Ililf;li.! ~Jfiifj:IQ):::.~~JlP;'&q:,EJiRJI:illS-c ~=*JRiBlt;if-~-r:;i;,-:>
t.:o '%/ifflid~h·~. )(\j.ltl:1<H.. >b:fi'fM::~*'l"'l!(tftl.'n:, Alsatitinae q:,)ftft.J:l.!~Nt>t.>l.'?

c.. ~It IJ .:t. :7*rffi1Q)--. ·:t .!.t :/ P"i?Gq:,lfl • J:ffilil;~~tL~o :::."FfJAf@~q:,rf:lt:q:,, '-'i>l·p7.,~l'I,Jt/f!l(.:: Q)ifl,f.l:.:lt~llfmtJ::i? ~ 7}:) il:. .:<. :7 ~Htrffi\iJ>, v- "f- ·;."'-''1:. >b &.;:;IJ ·{t. {~~fl!llm"<: ;l;, F.>o

~

* r.m
j£

an opportunity of visiting England.
where I fortunately studied the Japanese
form in comparison with the typicalAlsatites and also with other related
forms. As a result I am now inclined
to propose a new genus for it as amember of family Psiloceratidae. The
systematic description follows below
with a stratigraphical note.

Foreword

When I visited in 1943, together
with Mr. A. 0:-.:o, the Shizukawa district,a classical Jurassic area in Northeast
Japan, an interesting ammonite wascollected by Mr. 0:-<oDERA, a fisherman
who helped with our field work. He
kindly supplied it for us to study, but
it has been left undescribed because ofsome uncertainty in its indentification.
It was provisionally listed as Alsatites
onoderai MATSUMoTo (MS) in certain
Japanese writings (e. g. T. MATS"CMOTo1953 and other mimeographs) and thenominal species was recently cited byProfessor T. KoBAYASHI and Mr. K.
MoRI (1954) in their English paper on
Trigonians.
In the meanwhile, I had in 1953-54

Systematic Description

Superfamily Arietitaceae
Family Psiloceratidae HYATT, 1867
Subfamily Alsatitinae SPATH, 1924
Genus Yebisites** nov.

Type species.-Yebisites otzoderaisp. nov.

** Yebis [~~]: a name of an oriental
deity, dressed like a fisherman.

* Read June 18. 1955; received Oct. 28, 1955.
205

206

Tatsuro l\1ATS1lMOTo

Generic diagr.osis.-Evolute and widely
umbilicate whorls of roundedtosubelliptical cross-section, provided withperiodic constrictions, simple ribs and arather weak ventral keel. without fur·rows. In the outer whorl the ribs show
a forward bend towards the venter andare slightly swollen at their ventral
ends. Apertural margin has a moderately projected rostrum, lateral sinuses
and umbro-lateral lappets. Suture-line
similar to that of Alsatites, having long
and large lateral lobe, slender saddles
on both sides of it and descending• auxiliaries '.
Affitzity.-The periodic
constrictions
which characterize the present genus
are quite unusual in the Arietitaceae.
(The character is found only in someDactylioceratids among the Lower Jurassic Ammonitina.) Certainly the distinctness and frequency of constrictions
are of not more than specific value insome cases. as in Cretaceous Epigoniceras and Hauericeras. but in the present
case. the development of constrictions-cannot be ignored. They are too regular and too distinct to be regarded as
an accidental feature. say a pathologicalone. The faint line just in front of theconstriction certainly shows the apertural margin of the shell.
The suture-line is similar in general
pattern to that of A!satites or of Schlotheimia ( Waelmeroccras). Do Nov AN(1952, p. G43) has noted that the probable difference of suture-line between
Alsatites and lVaehnet·oceras is in thelength and narrowness of the external
saddle as compared with the first late·ral saddle. Although the partially water·worn condition of the specimen unfortunately prevents us from making aprecise decision, the observable sutureline is rather suggestive of the Alsatites

type.
lVae!meroceras has no keel at any
growth-stage and its ribs are weakened
on the outer whorls, while the present
new genus has a ventral keel and there
is no sign of weaKening of ribs on theouter whorl.
The flattening of venter and development of furrows, as seen in Vermi'ce'l'as, are not found in the present genus.
From this fact and from the differencein the suture-line the new genus is nota member of the Arietitidae to which
Vermiceras belongs.
The ventral keel, though small but
fairly distinct on the internal mould,
looks rather blunt on the outer surfaceof tiJe shelL being not much different
fro.n, if not equal to, that of Alsatites.
The ribs in the inner whorls aremostly straight and at right angles tothe ventral keel, without crossing it;
those in the outer whorls are gently
arcuate (concave anteriorly) on thesides and show a slight thickening or,
better to say, broade-ning at the ventrolateral shoulder and a considerable projection in approaching the mid-line ofthe venter, though dying out before
reaching the keel. In the curvature of
the rib the present genus has in somedegree affinity with Alsatites and also
Psiloceras (Caloccras).
The swollen ventral ends of the ribs
are unlike those in other Alsatitids. but
appears to me to be a s~hlotheimidcharacter, although in other respects
the ammonite is an Alsatitid.
To sum up, the new genus is, inthe present state of our knowledge, bestreferable to the subfamily Alsatitinae
and is presumed to be a special offshoot which has acquired the periodic
constrictions.

Yebisites, A New Lower Jurassic Ammonite from Japan

Yebisitcs onoderai sp. nov.
Pl. 30, figs. 1 a. b; 2 a, b, b', c. c'. d.
1953.

Alsatites onoderai ;'\lATSllMOTO. 110111.
a[. Historical
Geology, 2. p. 367 (listed only).

1wd. in KouA YASH I et

Material.-Holotype, Department of
Geology, Kyushu University, reg. no. G
1001, relatively well preserved as compared with the usual Jurassic ammonites in Japan. The last whorl is partly
missing.
Description.-Shell discoidal. with awide umbilicus and slight involution:
increase of whorls very slow, except in
the body chamber in which the heightincreases rapidly. Whorls depressed inyouth, almost as high as broad in the
middle growth-stage and somewhat
compressed in the last whorl, rounded
and then subelliptical in cross-section,with an arched ventral side and gently
convex flanks ; the maximum breadth
being a little nearer to the umbilicus
than to the venter.
A median keel appears in a fairly
early growth-stage, being distinct at adiameter of 15 mm. and continues todevelop throughout life. On the internal mould it is small (i. e. low and rather narrow), rounded and without furrows on both sides of it ; on the shellrather blunt.
Constrictions well-marked. about
three in each volution. broad and considerably deep ; running radially on theflanks and crossing the venter without
notable bend. The apertural margin,
which is traced as a faint stria in frontof the constriction, has a ventral rostrumlike projection, gentle lateral sinuses
and short umbro lateral lappets.
Shell ornamented with numerous
simple ribs of moderate strength, which207

are rather crowded in the inner whorls*,
usually as broad as the interspaces in
the middle stage and in the last whorl
widely spaced. The ribs are almost
straight and radial in youth, slightly
prorsiradiate and gently arcuate (concave anteriorly) in the middle stage
and in the last whorl considerably arcuate and bent distinctly forward near theventro-lateral shoulder. The ribs dieout before reaching the keel, without
forming tubercles. In the last whorl
they are some\vhat broadened near th~
ventro-lateral shoulder (without angulations) and from this broadened point
gradually become obsolete, showing aconsiderable projection, but never crossthe keel. The constriction passes overthe ventral side at right angles to thekeel, which in turn runs across the constriction.
Suture-line characterized by long L,
slendler saddles on both sides of L andthe obliquely descending 'auxiliaries'
which are suspensive. Although the observable external saddle is secondarily
worn, it is presumed to be nearly as
long as, and somewhat more slenderthan, the lateral saddle.

Dimensimzs (in mm.).Diameter Height Breadth (B/H) Umbilicu~%)(1) [90]25
21[51(56.6%)](2) 7018(±) 18(±) (1.0) 41(59%)(1) Preserved last whorl, the diameter andumbilicus of whicl1 are estimated fromthe restored figure.
(2) The next inner whorl.

Remarl?s.-To what has been mentioned
in the affinity of the genus, I add heresome minor points or details.
The keel of Alsalites has been described as typically blunt and rounded
and indeed the specimens which I have

* The number of ribs in one volution is 55
at a diameter of 25 mm.

208

Tatsuro MATSUMOTO

observed as well as the published figures do show that character. But I havefound a specimen at the Sedgwick
Museum (in the Drawer 105, \Vithout
reg. no., J. F. WALKER Collection, 1908,
Hettangian of Whitby, labelled as 'Caloceras liassicum (n'0R13I\.SY) ' of aprobable Alsatites, whose keel on theinternal mould is quite similar to thatof the present form, being small but
fairly distinct.
The density of the ribbing is said
to be an important character in theJurassic ammonites. In the present species the ribs are more dense in the inner whorls and generally more widely
spaced in the outer whorl. but the mostwidely sp3ced ribs are found in theearlier, instead of later, half of the bodywhorl. In some case, as in the outerwhorls of Psiloceras (Caloceras) johnstoni (J. DE SowERBY) and P. (C.) multicostatum Dosov AN, there is somevariability in the rib-spacing. The fact
has already been pointed out by
Do:"OVAN (1952).
A specimen which I have examinedat the Sedgwick Museum (in the Drawer
105, without reg. no., labelted as Caloce1'as jolmstmzi (SowERBY), LECKE:\13Y Coli.,
Lower Lias, Robin Hcod's Bay, England)has great irregularity in the arrangement of the ribs at diameters fromabout 40 mm. to 65 mm. The extremely
wide interspaces of the ribs among lesswidely spaced ones look at first sight
like wide constrictions, but they cannot
be said as true constrictions, because
they occur very irregularly and do notshow deepening. Such a character may
have nothing to do with the unmistakable constriction of the present species,
but its meaning is by no means perfectly explained.
Finally, I must confess that we arefar from a clear conclusion as to thephylogenetic relation of the present form
\vii:h other species. The isolated occurrence is one of the resasons for thedifficulty. The closest European relation
seems to be Aisatites proaries (NEU!\lA,YR), which, however. has the broad andblunt keel of Alsatitcs type and more
numerous ribs. For that species Proarictitcs was proposed by LAKGE (1922),
but I agree with SPATH (1924. p. 201)
to regard Proarietites as a synonym of
Alsatites. Therefore Yebisites cannot be
synonymized with Proarietites.
Occurrence.-The calcareous sandstone(the so-called Trigonia-Sandstone), i.e.
the Upper Member of the Niranohama
Formation. Shizukawa Group, exposedat loc. Sz-13 on the west of Niranohama,*, Shizulmwa-machi. Motoyoshi-gun,
Miyagi Prefecture [Province Rikuzen].
Very rare.
A Stratigraphical Note

Although the Shizukawa district is
one of the classical Jurassic areas inJapan, we have only rough knowledgeof its stratigraphy. As precise fieldwork is now being undertaken by Mr.
T. SATo, I tabulate below the outlineof the stratigraphical succession in the
Sh izukawa Group, depending on theunpublished manuscript of T. MATsu:-.loTo and A 0:-:o**, as well as on theprevious works. In ascending order:
Underlying:
Saragai Formation(Upper Triassic Norian)
Unconformity(apparently parallel)
Slzizukawa Group [~i'l!:lllll"'i'Wf.J.-A seriesof strata representing an imperfect cycleof sedimentation, the upper part of* ~J}Ii(~~S''llll;!\i'itJ l!llffilli / tA;i!§lfiJ]\!

*" The manuscript was submitted once to the
Geolo,;:ical Survey of Japan for a part of ·The
Geology of Japan', but has not been published.

Yebisites, A New Lower Jurassic Ammonite fro:n Japan

which is probably eroded away.
(1) Niranolzama Formation [:;lli/ ~JW].-Deposits of the basal or
marginal facies which indicatesthe beginning of the new transgression, 80-100 m.
(a) Lower Member [" Corbiculid·
beds '].-Black shale and sandy
shale. predominant, sometimes
calcareous and occasionally withintercalated conglomerate, pebbly
sandstone and coaly shale. There
are a number of fossiliferous
beds. Bivalves of the brackish
and shallow-sea environments.
(b) Upper Jltfember [' Trigoniasandstone '].-Mainly coarse-grained sandstone : subordinately
pebble-bearing sandstone andfine-grained sandstone; crosslaminated in some part. Fossil
shell beds characterized by
Trigonians and others of theshallow open-sea environments
are included.
{2) Hosoura Fon,wtiotz [$!Him~].­Black fine-sandy shale. often calcareous, and dark coloured silty
sandstone, 60-100 m. The lower
part is more sandy, containing
drifted vegetable fragments, while
the upper part consists mainly offine-sandy shales with intercalated
thin layers (10-20 em thick) of
fine to coarse sandstone. Fossilsof ammonoids, belemnites, gastropods and pelecypods are common
but rather sporadically distributed.
Unconformity(apparently parallel)<Overlying: Hashiura G1·oup [fliilfi~'iw.](probably Middle-Upper
Jurassic),
representing another cycle of marine
sedimentation. In the northern andwestem wing of the Shizukawa syncl-

209

ina! basin the Hashiura Group directly
overlies Lower-Middle Triassic Inai
Group.
The majority of the ammonites
hitherto described (YoKOYAMA 1904, 1915,
SATO 1954a, b) came, or are considered
to have been derived, from the Hosoura
Formation. A single specimen of Yebisites onode1·ai described above wasobtained from the calcareous portion of
the pebble-bearing coarse sandstonewhich belongs to the Upper Member of
the Niranohsma Formation. It is therefore the frrst occurrence of an ammonite
at such a low horizon of the Shizukawa
Group.
Apart from the palaeontologicalinterest, the discovery is important forthe stratigraphical problem of the Shizukawa Group. Because the form inquestion belongs to a new genus andbecause there are no reliable ammonites
occurring at the same horizon and in
the sub- or superjacent beds, it is very
difficult to decide accurately its geological age. However since the new genus
is regarded as a member of subfamily
Alsatitinae in Psiloceratidae. its age ispresu:1~ed to be somewhere in or near
· the middle ' or late Hettangian, fromthe general evolutional history of thegroup and of the related forms.
Now the question remains whether
the Niranohama Formation is whollyreferable to the Hettangian only or whether it has a wider range. The underlying Saragai Forms.tion has been considered as Norian from the abundantoccurrence of Entomonotis ochotica (KEY·sERLI:--:c) and its allies (e. g. K. IcHiKAWA, 1950). The Rhaetian in the proper sense is regarded as lacking, being
probably represented here by the unconformity between the Saragai and
Nirahohama
Formations.
Although

210

Tatsuro MATSUMOTO

many authors believe that the Rhaetian
deposits are generally absent in Japan,
I am not quite free from any doubt
about the subject. The so-called brackish and shallow-sea faunule of the Lower
Member of the Niranohama Formation
has not been thoroughly studied. The
hitherto described species are ··Cyrena"ellijJtica YoKOYAMA, "Cyrena" lzmulata
YmmYAl\ll\, ··Perna" rikuzenica YoKoYAMA, "Gcrvillia" trigona YoKoYAMA,
Gcratrigmzia lzosourensis (YoKoYA:'>IA)and Geratt·igonia lata KoBAYASHI: besi·
des them some ill-preserved plant remains including Baiem (?) sp. are contained. Among them the first species weretransferred subsequently (K. SuzuKI &K. OYAMA, l9·13; K. SuzuKI, 1949. p. 94)
to Polymcsodtl (Isodomella) of the
Corbiculidae, without, however. a detailed palaeontological discussion. The
occurrence of the Corbiculids at such alow horizon is unusual, if we consider
the distribution of the family in theworld*. Anyhow more precise information on the forms is wanted. Geratrigo.
1zia KoBAYASHI is again a peculiar
Trigonian, whose distribution and agecorrelation outside Japan are a future
problem. On the other hand. it is not
at present easy to tell from the sedimentary features how slowly or rapidly
the deposition of the Nirahohama Formation took place.
In the contemporary faunule of theUpper Niranohama, the following species have been palaeontologically described: T1·igonia senex KoBAYASHI &:tvloR 1, Gcratrigonia Jzosourensis (YoKo-* !vlr. R. CASEY has kindly informed me on
the subject (by personal communication in July
1954) in connexion with the preparation of
the manuscript of Corbiculidae in the forthcoming 'Treatise on Invertebrate Palaeon·
tology ·.

YAMA) var. convexa KonAYASIII, Geratrigonia lata KoRAYASlll, Vaugo11ia yokoyamai KonAYASHI & Mont, V. m'ranohamaensis KoRAYASHl & MoRI, V. namigashira KoBAYASHI & MoRI, "Belenmites" sp., "Belemnopsis '' sp. and Latomeandra yabei (EGUCHI)**. All of thembelong to more or less long-ranged
genera. so that they are not useful, atleast for the time being. for the international correlation precise enough forthe requirements of ammonite-palaeontologists.
If we turn to the superjacent Hosoura Formation, YoKoYA:\IA's genericassignment of the ammonites is obviously out of date. T. SATO, who is now
carrying on careful work on the ammonoid faunas, has reported (1954 a, b)
Tmetoceras and /lammatocenrs, both ofwhich indicate far later ages (Upper
Toarcian-Lower Bajocian). Apart fromYoKoYAMA's Ammonites sp. and · Sclllotheimia ' jimboi, no reliable species ofUpper Hett:mgian, Sinemurian and Pliensbachian ages have been described.
\Vithout complementary works on ammonites of the Hosoura Formation. thesignificance of the present new genus
cannot be adequately evaluated.
Acknowledgements

I \vish to thank Dr. W. J. AR~:ELL
and Dr. D. T. Do!>m·A:s for helps kindly
given during the preparation of thispaper: also Mr. W. N. EDWARDS, theKeeper of Geology, British Museum (Natural History), Professor W. B. R. Kt~Gand Mr. A G. BRIGHToN of the Sedgwick Museum, Cambridge, for permission
to carry out the work there as a British** EGUCHI origina!ly (193l) assigned the ageof this coral species to "Lower Liassic " butlater (1951) changed his dating to ·• Middle
Jurassic" without mentioning any reason.

Yebisites. A New Lower Jurassic Ammonite from Japan

Council Scholar.
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211

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Ceo/. Oest. Utzgams. 4, 135-226. pis. xvxxx.
YoKOYAMA, ~L (1904), On some jurassic
Fossils from Rikuzen. four. Coli. Sci Imp.
Univ. Tokyo. 18. Art. 6. 13pp., 2 pis.
- - (1915), On :t Jurassic Ammonite from
Rikuzen. Jour. Geol. Soc. Tokyo. 21. No.
253. (41)-(42), pJ. XX.

212

Tatsuro MATSUJ\IOTo

Explanation of Plate 30
Yebisites o11odcrai sp. nov.

Fig. 1.

Lateral (a) and ventral (b) view;;, natural size. Holotype, GK. GlOOl from Joe. Sz-13 ·on
the west coast of Niranohama, Shizukawa-m'lchi, Miyagi Prefecture, Upper Member ofNirannhama Formation. Shizukawa Group (Lower Jurassic).
Fig. 2. T.ateral (a) and ventral (b, b 1 ) views. whorl-sections at A ancl. B (c, c') and enlarged
suture-line (d) at s of the same spedmen as ab~ve. C: constriction. A sketch in naturalsize, unless otherwise statecl. (T. M. c!el.).

T . M A T SUMOT O.•

Plate 30"'~'eb" "tes
L'
zsz

la

I

(

I

-,

I
\
1 ' ••.1

I

~

\
\

I

\

''

I
/

'''

/

.......

-

2b'/--- --"'

/

2a

SO mm

'

( ' '' \

\!
2d

2b
'

I

I

l1 ,-ll
I I
JTrans. Proc. Pnlaeont. Soc. Japan, N. S., No. 23, pp. 213-217, 1 text-fig., Aug. 31, 1956

291. SOME PLIOCENE OTOLITHS FROM CHIBAPREFECTURE, JAPAN*
KOTORA HAT AI
Department of Geology, Faculty of Education, Tohoku University, Sendai

f~llii<"'.~VIf,f.ttJ·~Q)= • ="'lfi:i':

fliil!,l:lt!flilll"'aFmFtifCtJ· t?%t.Q)lf1:ii1Ymm~liailit t-t-:o~*/j' /~

treating the Recent otoliths it is regretted that discussions and figures are
generally restricted to a very small
number of species. that is to say, only
to the species considered important infisheries.
In the writer's study of the fossil
fish ear bones, he has first begun bycollecting as many as possible of the
Recent species so that direct comparison can be made with the fossil ones.
For this purpose besides those collectedby the writer many have been received
from Marine Biological Stations andFisheries Experimental Stations. However, until more than three fourths of
the Recent fish fauna of Japan is known
as to their respecti\'e otoliths, one cannot expect to make a thorough study.
In this respect the present report which
treats only four species is consideredpreliminary to further research.
Here the writer thanks Messrs. Jun
KATAOKA and Tetsuro OToMo. graduate
students in the Institute of Geology andPaleontology, Tohoku University, Sendai. for their kind offer of specimens.
Deep gratitude is due to Professor Yusa
KAMBARA of the Kochi University, Shikoku, for the identifiication of the
Recent specimens from Tosa Bay, Kochi

Abstract
Four new species of fish otoliths are described from the Pliocene ro:-ks of the northcentral . part of Chiba Prefecture, namely,
Otolitlms(Limmuia)
otomoi.
Otolithus( Owstonia ?) tsukizakiensis, Otolithus ( Scombrops) kataokai, and Otolitlms ( Sebastodes)
kokumotoe12sis.

Introduction and AcknowLedgements

Otoliths of fishes as well as of whales frequently occur from the Cenozoic
rocks ot Japan. but there are very few
records in literature, possibly due tothat they are not widely lrno\vn and tothat they resemble somewhat the brokenparts of molluscan and cirripedian shells. Hitherto there has been no detailstudy of such ear bones from the Japanese Cenozoic rocks probably due inpart to the difficulty in obtaining Recent material for comparison.
In dealing with the fossil otolithsof fishes the difficulty arises in the lackof literature bearing on the Recent species as most works in concern do notdescribe nor figure the otolith of thedifferent species. In the publications* Read, Oct. 1. 1955; received Oct. 29. 1955
213

Kotara HATAl

214

Prefecture, Shikoku, which he donatedto the writer's study. A part of theexpense of the present study was defrayed from the Scientific Expenditure
Fund of the Ministry of Education of
the Japanese Government.
Occurrence of the Fish Otolith>

The described and illustrated speciesof fish otoliths were collected from the
Pliocene Sakahata, Yanagawa and Kawayatsu formations developed in thenorth-central part of the Boso Penimula,
Chiba Prefecture in Central Japan. The
stratigraphic positions of the mentioned
formations according to the stratigraphic
order worked out by K. SAKAKtlRA (1935)
is given in Table I.

Table 1. Stratigraphic Sequence of the Formations as workedout by K. SAKAKVRA (1935)

Tsurumai
group

J

I
r
I

Koshikiya formation. Alternation of silt andIchijuku
sand. Fossils rare.
sand Kawayatsu silt. Massive silt oredominating,intercalating sand layers. Fossil3 common.
Yanagawa formation. 1\lassive formation. Fossils notcommon.
Habusawa formation. Alternation of sand and silt.
Fossil;; absent.
Sanbonmatsu silt. 1\hssive silt. Fossil> rare.
Hasumi sand. San!:\ with intercalated silt Ia vers.
Fossils common at places.

Satomi group

Nishihatagroup

Yabu sand. Sand, gravel and silt. Fossiliferous.
Jizodo sand. Sand intercalating a silt layer. Fossiliferous.
Kasamori silt. Massh·e bluish colored silt. Fossiliferous.
Mandano s:tnd and gravel. Coarse sand with gravel:;,Fossiliferous.

J ::::::~:::::~:;.£:~::~,;:~~;::·:~·::"::::l

Seki formation. Coarse clastic rocks. Fossils common
at places.

Description of the Fish Otoliths

Otolitlms (Limatzda) otomoi HATAI,n. sp.
Fig. 7.

Small, circular, measuring -1.5 x 4.0
mm in diameters. Surface roughened\vith several corrugatons, undulatory,
margins more or less projecting at ex-tremities of radial c0rrugations. Nucleus. resting and growing zones distinct;
nucleus small, central in position, resting zone much narrower than growing
zone.
Locality and geological formation:Upper part of the Sakahata formation
at Nishibuta, Otaki-machi, Isumi-gun,Chiba Prefecture. Pliocene. Reg. No. P301.

Remarks :-Although only one surface

Some Pliocne Otoliths from Chi~a Prefecture, Japan

215(all enlarged. five times n atural size)
Figs. 1, 2- 0tolithus (Sebasto des) kokumotomsis HATA I , n. s_p. 1 - i~ner view. 2- o~te r view.
Figs. 4, 5 -0to/ithus ( Scombrops ) kaiaokai HATAI, n. sp. 4- mner_view, _5-outer view.
Figs. 3 , 6- 0tolithus (Owsl'onia?) tsukizakieHSis H.ATAI, n. sp._ 3 -m ner view. 6 outer view.
Fig. 7-0to/ithrts ( L imanda) ot omoi H ATA I , n. sp. 7-outer VIew.

of the otolith can be observed, its outline, general size an d surface features
are close to certain species of L imanda ,a common fl atfish living along the Pacific coast of Northern and Central
Honshu. Compared with the ear bonesof Limanda angustirostris KrTAH ARA( Reg . No. P-18) collected from Sagami
Bay, Kanagawa Prefecture and identified
by Mr. Fujio Y ASUDA of the Fisherie:;
Department, T okyo University, th ~ present fossil is s imilar. However, the fossil can be distinguished f rom the Recent
species just mentioned by h aving smoother margins, stronger radial corrugat ions and more dist inct nucleus, rest ing
and g rowing zones.
The s pecific name is dedicat ed to
Mr. TetsurG 0 ToMo, one of my former
students, who collected the specimen
and kindly offered it to me for study.

Otol£thus ( Owstonia ?) tsukizakiensis
H ATAI, n . s p.

Figs. 3, 6.

Transversely subovate, measuring
about 8.5 mm in length, 5.0 mm in widthand 1.5 mm in thickness. Both dorsal
and ventral margins smooth, though thefor mer is provided with several broadfolds. Anterior and posterior sides bluntly rounded. Surface roughened, irregular, with about four short, irregularly
directed, broadly rounded, non-continuous
ridges. Outer side with ill-defined groove, which is shallow with sides parallel and not sharply margined, extending
throughout length of ear bone, while
surface minutely r oughened. Nucleus,
resting and growing zones obscure.
Locality and geological formation:Lower part of the Kawayatsu formation
at about 400 meters wes t of the Primary School at T sukizaki, Shiratori-mura,Ichihara -gun , Chiba Prefecture. Pliocene.
Reg. No. P-302.
Remarks :-The present otolith, althou.5h216l<:otora HATAI

not complete, resembles Owstom"a grammodmz (Fowum) (Reg. No. P-67), a
Recent fish from off Kochi Prefecture.
Shikoku, in outline, thickened aspect,lack of surface sculpture, smooth margins and ill-defined groove. However,the present otolith can be distinguishedfrom the mentioned species by the more
extensive groove, rougher surface ridges
and by the Jess angular outline. This
fo..c;sil otolith was collected by Mr. Tetsuro Oro~IO. graduate student of theInstitute of Geology and Paleontology,
Tohoku University, Sendai.
0/olitlms (Scombrops) kataokai
HATAI. n. sp.

Figs. 4, 5.

Transversely oval in shape. measuring 10.0 mm in length, 6.0 mm in widthand 2.0 mm in thickness. Dorsal margin
with 13 denticles radiating from central
part. of which the eighth and thirteenth
are strongest: extremities of each denticle rounded, more swollen dorsallythan centrally. separated by much narrower interspaces of varying width.
Anterior margin characterized with one,broad, swollen ridge extending posteriorly to about two-thirds length of earbone, but broken up into four vague,
short, swollen, both dorsally and ventrally directed mounds, separated from one
another by shallow valleys. Posterior
margin with bifurcated and broadly
rounded ridge with a small denticle
between. Ventral margin with about 17
small denticles including the vague ones.
each separated by short but narrow valleys. Inner surface triangularly swollen
and the outer side flat in lateral view.
Inner side flat with median groove extending throughout length of otolith:
groove rounded anteriorly, flaring posteriorly, ventrally expanded centrally,

their ~argins sharp inwardly but raisedon their outer parts and gradually sloping ventrally and dorsally. Nucleus,
growing and resting zones obscure.
Locality and geological /ormation :Upper part of the Sakahata formation
below the Primary School at Otadai,
Oikawa-mura. lsumi-gun, Chiba Prefecture. Pliocene. Reg. No. P-300.
Remarks:-The
described specimen
seems to be assignable to the genus
Scombrops and can be distinguishedfrom Scomln·ops hoops (HoUTTUYN) (Reg.
No. P-115). a Recent fish from off the
Boso Peninsula,
Chiba Prefecture.
which was identified by the writer.
Compared with the Recent species. thefossil one is much thicker, less curved,
with stronger denticles. less projecting
anterior margin and with broader andless curved groove.
This otolith is named after Mr. Jun
KATAOKA. a graduate student of theInstitute of Geology and Paleontology,
Toholw University, Sendai, who collected
the type.
Otolithus (Sebastodes) lwkumotocnsis
HATAI.

n. sp.

Figs. 1. 2.

Transversely oval in shape, measuring 9.5 mm in length, 5.5 mm in widthand about 1.8 mm in thickness. Dorsal
margin with nine teeth. roughly separable into anterior and posterior halves,the former consisting of three narrowand long denticles separated from one
another by grooves dorsally and by narrow valleys ventrally, and the latter offive more or less fused denticles of varying breadth and separated by shallow,
narrow valleys: extremities of teeth
rounded. more sharply on anterior tl1an
on posterior half. Anterior side characterized \vith bluntiy rounded marginSom~ Pliocene Otoliths from Chiba Prefecture, Japan

formed of three blunt denticles. Posterior side with two broadly rounded,bluntly pointed denticles, one dorsal andthe other ventral to median line. Ventral margin with 16 narrowly rounded
denticles including the vague ones, of·them the posterior- and anterior- mostare strongest, separated by narrow valleys. Both dorsal and ventral teeth
gradually rise towards to central area toform a more or less low triangular ridgein lateral view. Outer side almost flat,
incised with broad, nearly straight groove extending throughout length of ear
bone. expanding at both anterior andposterior extremities. inner margin rather sharp, more or less rounded, ventrally incised near middle of length,
outwardly raised but gradually lessening
in height towards doraal and ventral

217

margins. Nucleus, resting and growing
zones obscure.
Locality and geological fonnation :Upper part of the Yanagawa formation
in a cliff north of the second tunnel
bordering the road leading from Tsukizaki station to the village of Okubo,
Shiratori-mura. Ichihara-gun. Chiba Prefecture. Pliocene. Reg. No. P-303.
Remarks:-The described and figured
specimen resembles in several features
Sebastodes
sclzlegelii (fhr.GENDORFF)(Reg. No. P-55) collected from Mutsu
Bay, Aomori Prefecture, but has a thicker, less curve1 ear bone with stronger
teeth and more rounde1 anterior andposterior sides. Also the groove of thepresent otolith is more extensive andstronger.

218

PUBLICATIONS RECEIVED (15)--------1234. CRETTAZ. P.: Geologische Untersuchun·
gen an der Alpen·Apennin Grenze in
Ligurien (Italien). Mitt. Geol. Ins~. Eidg.
Techn .. Univ. Zurich. Serie C. Nr. 61
1955.
1235. HEIERT.l, IT.: Geologis('he Untersuch·
ungen in der Albula zone zwischen Crap
Alv und Cinuos·chel (Graubunden).
(lnaugurai·Diss. Erl. Phil. Dokt. Phil.
Fak. 11, Univ. Zurich). Ibid .. Ser. C, Nr.
62, 19.>5.
1236. JA.cKLI, H.: Geologische und hydrologische Vorstudien fiir eine Wirtschaft·splanung in Afghanistan. Ibid., Ser. C,
Nr. 63, 1955.
1237. Anthropozoikum IV 1954.
1238. COOPER, G. A.: New Cretaceous Bra·chiopoda from Arizona. Smiths. 1\liscColi., Vol. 131. No. ·I. 1955.

1239. l'Milil:ki!f-3ti!1!~1mfiff~#Ht Cf!:Jf,&f'f*J·
No. 6, 195-L
124{). Reports of the Liberal Arts Faculty.
Sizuoka Univ., (Nat .. Sc.) "!'io. 7. 1955.
12•11. Ibid .. No. 8. 1956.
1242. DURHAM, J. W.: Classification of CJy.
peasterioid Echinoids, Univ. Calif. Pub!.
Geol. Sc .. vol. 31. No. ·1·, 1955.
1243. WILLIAMS, H. & H. MEYER·AIIlcH:
Volcanism in the Southern Part of EJ
Salvador, Ibid., Vol. 32. 1\o. 1. 1955.
1244. KELLOGG, R. : Three 1\Iiocene Poroises
from the Calvent Cliffs. Maryland. Proc ..
Unit. National Museum. Vol. 105, No.
3354, 1955.
1245. GAZIN. C. L.:
Paleocene 1\lammalian
Faunas of the Biscon Basin in South·Central Wyoming, Smiths Misc. Coli ..
val. 131. No. 6, 1956.
1246. jour. Fac. S:., Hokkaido Univ .. Ser. IV.
Geol. & Mineral. Vol. IX No. 3. 1956.
1247. Jour. Earth Sc., Nagoya Univ .. Vol. 4.
No. 1. 1956.
1218. DoWNs, Th.: The Mascall Fauna from
the Miocene of Oregon, Univ. Calif.

Pub). Geol. Sc., Vol. 31, No. 5. 1956.
1249. McLEARN, D. j.: Devonian Formationsin the Alberta Rocky Mountains between
Bow and Athabasca River:;, Geol. Surv.
Canada, Bull. 35, 1955.
1250. }ING!IWA Hsu. K.: Granulites and My·
lonites of the Region about Cucamongaand San Antonio Canyon, San Gabriel
Mountains. Califomia, Univ. Cali. Publ.
Geol. Sci.. Vol. 30, l\lo. 4. 1955.
1251. SAVAGE, D. E.: Nonmarine Lower Plioc·ene Sediments in California. A Geochro·nologic-Stratigraphic Classification. Ibid.
Vol. 31. No. 1, 1955.
1251. Collecting and Breeding, Vol. 18. No. 7,
1956.
1253. STOCK. C.: Mammalian Fauna fro:n the
Titus Canyon Formation. California,
Carnegie Inst. Pub!. 58-t., 1949.
125,1. ARNor.D.
M.: The Contributions ofJean le Calveg to the study of the For·
aminifera, Contr. Cushman Foundation
for Foraminiferal Research. Vol. VIII,
Pt. 1, 1956.
1255.
The construction anduse of a single die for plastic micro·
paleontological studies, Micropaleontology. Vol 1. No. 4. 1955.
1256. LANGSTON, W. & J, W. DURHAM: A Sauropod Dino:;aur from Columbia, Jour.
Paleont .. Vol. 29. No. 6. 1955.
1.257. TiscHLER. H.: A New Mississippian
Tetracoral from Death Valley, California,
Ibid. Vol. 30. No. 1. 1956.
12!'8. DURHAM, J. W. : Insect Bearing Amberin Indonesia and the Philippine Islands,
Pan-Pacific Entomologist, Vol. 32, No.
2. 1956.
1259. - - & R. H., jAHKS, D. E. SAVAGE :Marine-Nonmarine relationships in the
Cenozoic section of California, Cont.
Mus. Palaeont. Univ. Calif., No. 664.
1956.

z.

Trans. Proc. Palaeont. Soc. Japan. N. S.. No. 23, pp. 219-220, 1 text-fig .. Aug. 31. 1C'56

292. A NEW SPECIES OF LINGULA FROM HOKKAIDO, JAPAN*
ICHIRO HA YASAKA
Geological

Institute. Saitama University
and

KOTORA H..i\.T AI
Department of Geology, Faculty of Education. Tohoku University. Sendai::lt/filif!i~ Litzgula ( J ) - ~fill: :ltifi.i.lti2i!~1llll\iitJIIl!l]'iff-3f-c:tihht.: .t<- lJ :/ !1(1), "1'- (~~125m. i'iiiftll:. ~JH1'1fffi) :b' G Lit1gu/a (J)f}im!~3Ui Lf..:.(1)·t:- Lit1g11/a akabiraeiiSis c lilrf1 L'C:l'ailit Lt:..
.!f.~-nl\. *'B1t:'J'~

Sorachi-gun, Ishikari Province in Hokkaido, is described in this article. The
siltstone evidently belongs to the Oligocene Poronai formation (K. 1-IATAI-Y.
KAMADA, 1950).
The
specimens
are all of small
size, still retaining
their original chitinous shell covering and thus revealing the details of
surface sculpture.
However, upon exposure the shellmaterial easily deText-figure 1.
taches itself from
Lingula nkabirae11sis
the siltstone and isn_sp. Holotype. x 5thus easily lost.
The Qriginal coloration is not preserved and there isno evidence for judging what it may
have been.

Although marine Cenozoic rocks are-extensively developed in the JapaneseIslands, records of the occurrence ofLingula are but few. According to K.
HATAI (1954), t11e genus has been illustrated on specimens from the Pleistocene
deposits of Tokyo and from the Pliocene
rocks of Miyagi Prefecture, but not from
elsewhere in Japan. The mention of
the genus in lists accompanying different
articles on geology were left out of consideration because the details remain
to be known only by persons who
have access to the original specimens,
which have been largely destroyed or
misplaced by causalities and moved toa place of safety during the WorldWar II.
The discovery of several specimens ofa new species of Lingula from a darkcolored. compact. more or less carbonaceous siltstone from a boring core (labelled ::\o. 15) at about 125 meters in the
Akabira colliery in Takikawa-machi.
*Read and received Oct. 29, 1955

219

Ichiro HAYASAK.\ and Kotora HATAI

220

Lingula a/wbiracnsis HAYASAKA
and HATAI, n. sp.
Text·figure 1.

Shell small in size, measuring about
8.0 nun in length and 4.0 mm in maxi-

mum width, moderately convex, elongate, narrowly oblong: sides nearlyparallel with each other. tapering anteriorly and posteriorly, tapering rather
abruptly toward the straight anterior
margin, while quite acutely toward thebeak which is roundly pointed posteriorly. Surface covered with microscopic
growth-lines which become strong atlateral sides where they appear as
gentle corrugations and at anterior margin they appear as mere periodic weak
undulations. Anterior margin short,straight, with aspect of very slight indentation, rather abruptly passing into
tapering lateral sides.
Locality and gt~ological formation.Akabira, Takikawa-machi, Sorachi-gun,Ishikari Province. Hokkaido: 125 meters
underground. Poronai formation: Oligocene. Preserved in the collection of the
Department of Geology, Faculty of Education, Tohoku University, Sendai. Reg.
No. 3001 (Holotype), Reg. No. 3002
(Para types).
Remarks.-The present species is in
its preserved features similar to Fig. 4of T. DAv mso:-; 's Li11gula an at ina (1888,
pl. 29, fig. 4), a species which is now
known as Lingula unguis Ly:-;c-;AEUS.
However, the more acutely pointed posterior region of the shell, narrower outline, shoxter anterior margin and morestrongly tapering lateral sides near theanterior margin all serve to distinguishthe present species from the well-known
and rather widely distributed Lingnla
unguis. There appear to be no otherspecies with which the present one canbe compared.
Beside the holotype, there are several'paratype specimens which agree withthe type in all preserved features, but
none of them exhibit the characters ofthe muscular scars. in spite that a
few had part of their test broken during breaking of the entombing rock
This may suggest that the muscularscars may have been weak
From the evidence that the lingulids
are embedded in a dark colored, finegrained siltstone in which carbonaceous
matter is common, and no other fossils
occur in association, it may be suggested
that the conditions prevailing at thetime the brachiopods flourished, was notfavorable to other marine animals. The
sea bottom having a considerable
amount of carbonaceous matter is generally not a suitable environment forother kinds of animals. Liugula, however. is known to survive in conditions
which would be fatal to other animals(K. HATAI, 1949, pp. 183-186).

Refercnl'es
DAVIDSON. T. (1888), A 1\lonograph of Recent Brachiopoda. Tram. Linn. Soc. Lolldoll, Second Scr. Zoology, ~·of. 4, pt. 3,
pp. 205.215, pl. 29. figs. 1-8 (comparewith fig. ·l).
HATAI, K. (1940), Cenozoic Brachiopoda ofJapan. Sci. Rep. Tolzoku Imp. Univ., Ser.
2, Geology. vol. 20, pp. 183-186.
HATAI, K. (1950), Check List of JapaneseTertiary and Pleistocene Brachiopoda.
Sci. Rep. Tokyo Kyoiku Daigoku, Sec. C,
vol. 3, 110. 21, pp. 99-139.
HATAI, K., and Y. KAMADA (1950), Foosil
Evidence for the Geological Age of the
Uchigo Group. Joban Coal-field. Short
Papers, Inst. Geol. Pal., Toholw U11iv., no.
2. pp. 58-73.

Trans. Proc. Palae.ont. Soc. Japan, N. S., No. 23, pp. 221-224, PI. 31, Aug. 31, 1956

293. ON THE MIOCENE PECTINIDAE FROM THE ENVIRONSOF SENDAI; PART 8, ON PECTEN (PATINOPECTEN)
KIMURA! MATUMORIENSIS NAKAMURA*
KOICHIRO MASUDA
Department of Geology, College of Education, Tohoku Univereity, Sendai{~J~JII;jifi):flif~~'f:

MURA 1.: -?1. ,-t: :~(7) 8.

Pecte11 (Patinopecten) kimurai matumoriemis NAKA.: tLit P. kimurai
Pati11opecten (7)!\Jic L..-C~!/t; """~~~~ c;'Jj,i. l!J:ta~Z.rrl.', J!!l.:i&J(

Pectinidae,

iltc&'ltl.$:fii!(7)m~tJ· ~ (7)~Jflx(7)~1.: -?1., -t:~n L.. t.:M:!J!.

Q)lffiflilc l."t:~ltt~ <.

~i'Rt~~fNI.:ffi'i~l.:~ttt..:o:!.tl EE ~- f!S

of the Tohoku University, and of the
Saito Ho-on kai Museum, all in Sendai
City. The results of comparative study
lead the writer to consider the present
species to be of specific ranking.
In this article is presented a redescription of this species based upon thespecimens collected from the type locality, and a discussion of its relationshipwith related species. The geologicalsignificance, so far as can be judged
from field data, is also given withregard to this species.
Acknowledgements are due to Dr.
Kotora HATAI of the Department of
Geology, College of Education, Tohoku
University, for kindly supervising thepresent work Thanks are also due tothe students of the College of Education,
Tohoku University, who assisted in thecollection of specimens.

Introduction and Acknowledgements

Pcctetz (Petitwpecten) kimurai matumoriet~sis

was first described by M.
NAKAMURA (1940) from the Nanakita
formation at Matsumori, Izumi-mura,
Miyagi-gun, Miyagi Prefecture in thenorthern border of Sendai City. This
species, so far as literature is concerned,
is known only from the type locality
and places nearby Sendai. Abundantspecimens of this species which is oneof the largest among the Miocene Pectinidae from Japan, were collected by
the writer with the assistance of somestudents of the College of Education,
Tohoku University, from a pebbly conglomerate at the lowermost part of the
Nanakita formation.
The writer studied numerous specimens of this species and compared themwith the related species which are now
preserved in the collections of the Department of Geology of the College of
Education, the Institute of Geology andPaleontology, Faculty of Science, both

Description
Family Pectinidae
Subfamily Pectininae
Genus PatitZOpccten DALL, 1898
Patinopectetz matmnoriemis (NAKAMURA)* Read at the 62nd me~ting of the Society
at Tokyo. Oct. 29. 1955 ; received Oct. 29, 1955.

Pl. 31, Figs. 1, 2a-b. 3a-b, 4.

221

222

Koichiro MAslJnA

1937. Pecten (Patinopecten)

kimurai YoKoand lL\TAI, Saito/lo-on Kni !vfus .. Res. Bull., No. 13. p.
130. pl. 19, fig. 5.
1940. Pecte11 (Pati11opectm) kimurai YoKoYAMA.
matumoriemis
NAKAMURA,]apa11 four. Geol. Geogr., Vol. 17, Nos.
1-2, p. 13, pl. 1, figs .. 1, 2 pl. 2, figs. 1-3.
YAMA,

NOMURAThe original description of this species
is as follows :Shell large in size, circular in outline,
much compressed. Valves sculptured bylQ-12 strong, radial ribs, which arerather sharply elevated, round on top andnearly equal to or a little narrower
than its interspaces. Interspaces smoothon both bottom and sides ; otherwise
similar toP. kimurai. Length 146.5 mm.,width 145.2 mm., depth of intact valves
34.5mm.
The enlarged collection now permits
a more detail description as given be·
low.
Shell very large in size, thick, orbicular in outline, equilateral except forauricles; right valve more convex thanthe left ; both valves radiately ribbed
and forming an angle of about 100° at
apex.
Right valve gently convex, with lQ-14
stout, round-topped radial ribs and fineconcentric growth lines ; radial ribs
much broader than their interspaces inbreadth near the beak, but nearly equal
to or a little broader at the lower halfof disc, and they tend to become obsolete towards the antero-posterior dorsal
margins; the radial ribs on anterior
Right

Valve

Right
-

j

HeightLengthHinge-length
Depth
Apical angleIca. 140
140
80

25
100°

dorsal side rather more distinct thanthat of posterior side. Left valve nearlyflat or a little convex, with lD-14 distinct radial ribs which are much narrower than their interspaces in breadthand with fine concentric growth lines,
and ornamented by obtuse network in
the younger shells ; radial ribs sharpnear the beak and tend to becomerounded towards the ventral margins,
and that of anterior side usually more
distinct than that of the posterior side.
Auricles of right valve very large, subequal in size, though the anterior is alittle larger than the posterior, and alittle folded upwards near the dorsal
margins; anterior auricle furnished withwide and shallow byssal notch, andornamented by concentric lines and a
few very faint radial threads ; posterior
with sculpture similar to the anterior.
Anterior auricle of the left valve a little
larger than the posterior. sculptured
with fine concentric lines and a few
faint radial threads, and slightly folded
downwards near the dorsal margins:posterior auricle with sculpture similar
to the anterior auricle. Hinge of theright valve with distinct cardinal crura,
and wide and deep resilial pit provided
with short, low, fine lateral ridges which
are gently curved inwards. Left valve
with hinge provided with shallow sockets
corresponding to the lateral ridges ofright valve. Interior surface of both
valves gently folded corresponding to
the exterior sculpture.
Dimensions (in mm.) :Right

-

132

137

-

ca. i7
24
100°

I

I

70
20.5
100°

I

Left

Left

Left

145
150

130
145

120
132
78
110°

75

18
100°

78
16
110"

On the 1\Iiocene Pectinidae from the Environs of Sendai; Part 8

Remarlls :-This species is characterized
by the larger, orbicular and inequivalved
shell, about 12 stout, round-topped radialribs. conspicuous large auricles which
are slightly folded upwards near thedorsal margins, and distinct cardinal
crura in the right valve, and by themuch narrower radial ribs which are
sharp near the beak and rounded atlower half of disc, larger auricles which
are slightly folded downwards near thedorsal margins, and cardinal crura in
the left valve. The radial ribs of both
valves usually tend to become obsolete
towards the dorsal margins, but radialson the anterior submargins are more
distinct than that of the posterior.
This species was originally described
as a subspecies of Patitzopecten kt'murai(YoKoYAMA) by M. NAKAMURA (1940),
but it is easily distinguishable fromkimurai by the larger and thick shell.
a little more number of radial ribs, nostriae on the backs and flanks of radia 1
ribs in the right valve, much larger
auricle which are slightly folded near
the dorsal margins, and the characteristics of hinge area. From the above
mentioned characteristic features thewriter considers that the present species
should be placed in specific rank.
S. NoMURA and K. HATAl described
Pecten (Patitzopectett) kimurai YoKoYAMA (1937, p. 130, pl. 19, fig. 5) from the
Nanakita formation at Matsumori, but
examination of the specimen, which ispreserved in the collection of Saito Hoon Kai Museum, shows that it should
be refered to matumm·iensis.
This species appears to be relatedwith the Pliocene Fortipecten takahashi£(YoKOYAMA) (H. YABE and K. HATAI,
1940, pp. 147-lGO, pis. 34-35) in having
a large and thick shell, 7-14 radial ribs,
and large auricles, but the latter is distinguishable from the present species by

223

greater convexity of the right valve, 714 radial ribs which are much narrower
than interspaces on the both valves,
weak radial riblets on the valves, muchlarger auricles, and cardinal crura. This
species is also related to Pecten (Fortipecten) hallae DALL (MAcNEIL, MERTlE
and PILSBRY, 1943, pp. 86-87, pl. 12, figs.
1, 2, pl. 13, fig. 1) described from the
Pliocene Buried Beach near Nome in
Alaska. The Alaskan species differsfrom the Japanese one in having a more
inflated shell and radial ribs broader
than their interspace in the right valve,and in having numerous fine riblets in
the interspaces and submargins in theleft valve. Pati1zopecte1z ibaragie11sis
MASUDA (K. MASUDA, 1953, pp. 41-46, pls.
5-6) described from Hitachi City, Ibaragi
Prefecture more or less resembles thisspecies, but it is distinguishable fromthe present one by the smaller shell,smaller auricle, and greater number of
low and flat radial ribs of the rightvalve, and by. the numerous, faint radial
riblets of the left valve.
Geological SignificanceThe present species, which is restricted
in distribution to the type locality andseveral places nearby, was also found in
the uppermost part of the Aoso formation at Nagashiba, Tomiya-mura, Kurokawa-gun, Miyagi Prefecture and a few
questionable specimens were obtained
from the 6tsutsumi formation at Dodokoro, Izumi-mura, Miyagi-gun, all innorthern border of Sendai. These formations are all Miocene in age.
Although P. matumoriemis is abundant in the pebbly conglomerate of thelowermost part of Nanakita formation
at Matsumori, it become fewer towards
the north. This decrease in number may
be due to the change in environmental

Koichiro MASUDA

224.conditions, being favorable at Matsumori and nearby, but less so elsewhere,
though there appears no remarkablechange in lithology in this horizon. The
water action is considered to have beenstronger at Matsumori and its environs
than the northern area.* As Cltlamys
kanelzarai (YoKoYAMA), which is thecharacteristic species of this horizon, isabundant and widely distribut~d. it isconsidered that P. matumorieusis wasmore sensitive.
From the above mentioned it is considered that the distribution of matumoriensis was influenced by physicalrather than bottom conditions.
The present species is restricted in its
geological range to the Early Miocene.
RefL~rences:\L\CNEIL. F. S .. MERTlE. J B. and FILSBRY.
H. A .. (1943). l\'larine lnvertebra~e Faunasof the Buried Beaches near Nome. Alas-* K. MAsr·nA: On the lVliocene Pectinidae
from the Environs of Sendai: Part 7. On
Pectan kaneharai YoKOYA~L-\. Tra11s. Proc.
Palaeont. Soc. japa11 (in press).

ka. joum. Paleo11t .. Vol. 17. No. 1. pp. 86-87, p!. 12. figs. 1. 2. pl. 13, fig. 1.
J\.lAsrDA. K. (1953). A New Species of PatillopectetJ from Ibara~i Prefectnre. Short
Papers, IGPS. No. 5. pp. H-46. pl. 5. figs.
1-5. pl. 6. figs. 1-5.
NAKAMt:RA. M. (19~·0). On Some Pectinidae
Fossils from the 1\·liocene Deposits of theTomiya Block. Miyagi-ken. Northeast
Honsyu. Japan. japa11. jour. Geol. Geogr..
Vol. 17. Nos. 1-2. pp. 13-14. pl. 1. figs. 12. pl. 2. fi5s. 1-3.
NoMt'HA, S. and HATAI. K. (1937). A Listof the Ivfiocene Mollus::a and Brachiopoda
collected from the Region lying Northof the Nanakita River in the Vicinity of
Senclai. Rikuzen Province. Japan. Saito
Jlo-o11 A"ai Mus .. Res. Bull.. No. 13. p. 130.
pl. 19. fig. 5.
YABE, H. and HATAI, K. (1940). A Note on
Pecten (Fortipecte11. subg. nov.) takalzaslzii
YoKOYAMA and Its Bearing on the Neogene Deposits of Japan. Sci. Rep .. Tolloku
Imp. U11iv .. Ser. 2. Vol. 21. No. 2, pp. U7-HiO. pis. 34-35.
YOIWYAMA. M. (1925). Mollusc:m Remains
from the Uppermost Part of the Jli-ban
Co:~l-Field.

jour. Coli. Sci .. Imp. Univ.
Tokyo. Vol. 45, Art. 5, p. 27. pl. 2. fig. 4.

pl. 4. figs. 1-6.

Explanation of Plate 31
PatitJopecten matumoriemis (NAKA'li1URA)
Fig. 1.

Right valve. x 1/2. DGS. Reg. No. 1961. Loc. :Niatsumori, Izumi-mura. Miyagi-gun,
Miyagi Prefecture.
Figs. 2a-b. a. Right valve, x 1/2. b. Hinge area of 2a. xI. DGS, Reg. No. 1960. Loc. Sameas above.
Figs. 3a-b. a, Left valve. x 1/2. b. Hinge area of 3a. x 1. DGS. Reg. No. 1961. Loc. Sameas above.
Fig. 4. Left valve. x 1/2. DGS. Reg. No. 1960. Loc. Same as above.

K. MAsUDA: Miocene Pectinidae

K. KUMAGA I, Photo.

Plate 31

Trans. Proc. Palaeont. Soc. Japan, N. S., No. 23. pp. 225-228. Pl. 32. Aug. 31, 1~56

294. ON SOME NEW SPECIES OF RAUSERELLA FROM
MT. IBUKI, SHIGA PREFECTURE, CENTRAL JAPAN*
MANABU KOBAYASHITokyo University of Educ:ttion

i'fi~lJ!',fjH!killl.:~-t ~Rausere/la (7)tJffii!l.: "'::>\ ''C:~!JU:fi!!}:U.f:t:i!1()fii\¥i!fll.:]l;eoschwageri7w<: ~ff:-t ~ Rauserella ~~~ l..J: (7)·C, _::.. (7)~'l!t$5"JtE'ffWJIHI C. Wifm (7),jC.~Z.~:5'-t ~.

1] ·i*!!/:

Rauserella erratica the genotype andpreviously the only known species of
the genus was reported by DUNBAR (1944)
from the upper Guadalupian of America.
The only records of the occurrence ofRauserella in Japan are there by KAr-;~mRA and MoRIKAWA. KANJI.IF.RA (1954)
described Rausm-ella sp. from the Kuma
formation in Kyushfl, where it is associated with Yabeina columbiatza (DAwso:-;), Y. yasubaetzsis ToRIYAMA, Y gublcri KANMERA, Lepidoliua toriyamai
KA:-.::o.mRA, L. kumaensis K., Pseudodolioliua jJseudolepida var. gravitesta K.,
Codouofusiella czmiculata K., Dzmbantlla ? sp., Sclzwagerina aff. acris THOMPSON& WHEELER and Schwaget·ina pseudocrassa K. These fossils indicate thatthe geological age of Rauserella sp. is
upper Permian, or precisely the Yabeittazone. MoJUKAWA described a form of
Rauserella from the Yabeina zone of the
Kanto massif. From these it may beinferred that the geological range ofRauset·ella is restricted to the zone of
Yabeina in Japan as in America.
The geological distribution of Rauserella on l\1 t. Ibuki is rather wide. but
owing to that the number of specimens
is tew it was difficult to obtain welloriented sections. However, the asso-

Since 1953, the writer has been engaged in a study of the stratigraphy
and paleontology of rvrt. Ibuki, Shiga
Prefecture, Central Japan. As one of
the results. the fusulinid zones distinguished in the Ibuki-yama limestone formation were found to correspond to thezones of Atcrvoschwageriua to thelowest Yabcina. At the time, some new
species of Rauserella were discovered
in a horizon lower than that in which
the genus was hitherto believed to be
confined. This fact is interesting when
considering the range of the genus
Rauserella.
The writer wishes to thank Professors
Haruyoshi FuJL\toTo and Kotora HATAI, of the Institute of Geology andMineralogy, Tokyo University of Education. for their kind advice and encouragement with regard to the present paper.
The genus Rauserella was defined by
DuNBAR (1944) as a fusulinid with irregulary coiled outer volutions in themature stage. It was assigned withsome question to the Ozawainellinae byTHo}.lPso:-:, who concluded that its aberrant nature indicates that the particulargroup is near "the end of life history··.

* Read June 18. 1955; rec"ived Nov. 1. 1955.
225

.Manabu KoBAYASHI

226

ciated species in the present field weredistinguished to compare; Neoschwagerina sp., Parafusulina sapperi (Sn;pp),Schwageriua japonica (GuMBEL), Pseudofusulina sp., Cod01wjusiella sp. Judging
from these associated species. it can beconsidered that the geological range ofRauserella is not only restricted theupper Permian, or the zone of Yabeiua,
but that its lower limit extends down
to the zone of Neosclzwagerina.
Descriptions of species

Genus Rauserella DuNBAR, 1944

Rauset·ella fujt'motoi KoBAYASHI, n. sp.

Remarks: The inner discoidal, planispiral volutions, irregular axis of coilingand aberrant outer form of the present
species refer it to tl:.e genus Rause1·ella.
The present species is easily distinguished from Rauserella en·atica DuNBAR
by its outer shape: expanded form,
minute size, shorter axis of coiling, andsharper periphery in the earlier volutions.
Locality and Occrwrence: This species
is found in the Ibuki-yama limestone
formation at the ridge about 500 m. to
the northeast of lbuki-yama. It is as.;ociated with Parafusulina sapperz· (STUFF),
Pseudofusulina sp., Codonofusiella sp.
and Sclmbertella llingi Du!\BAR & SKit'NER.

PI. 32. figs. 1-7.

Shell minute. irregularly coiled andirregularly ellipsoidal in form. The
length and width of the last volution
are about 1.4 mm. and 0.88., respectively,
its form ratio is 1.6. The earlier two
to three volutions are planispiral anddiscoidal in shape with a subangularperiphery. and short axis of coiling.
Beyond these volutions, the axis of coiling changes its position irregularly, andthat of the last volution becomes perpendicular to the earlier ones. The proloculus is minute, measuriug 52 to 72
microns in outer diameter. The shell
expands gradually in the earlier volutions. but sharply in the outer ones.
The spirotheca is very thin and composed of tectum, diaphanotheca andinner tectorium in outer volutions. which
are obscure in inner volutions, its thickness is 14 to 22 microns in the first to
fourth volutions. The septa thin. numbering 11 and 11 in the third to fourth
volutions, respectively.
The chomata are not evident in theouter volutions but can be faintly observed in the inner discoidal volution.

Results of measurements:Reg. No. 20501

Loc. No. H<l2.
Pro.! V.l 1 V. 2 V.3 V. 4: V. 5 V.6------1--~---'--Height ofvolutionThickness of
sp1rotheca

Ill

35

70

88

16

22

22

105 168

I

17117

22

Reg. No. 20502
Loc. No. H-32.
-----,Pro.~~~~~~Heigh~ of-volutwnThi~knessof
sp1rotheca

45

1

I

83

61

112

.---'--'--I

14

14 114 : 17

1

17

1

(in microns)

Rauserella sp.
Pl. 32, figs. 8-9.

Shell minute, irregularly elongate inform, axis of coiling irregular. The

On Some New Species of Rauserella from 1\lt. Ibuki, Shiga Prefecture

shell of three and half volutions about
1.4 mm. long, and 0.6 mm. wide, its form
ratio about 2.4. The inner one and half
volutions are involute discoidal. planispiral with subangular periphery. The
axis of coiling in the earlier volutions
is short. but thereafter the inner one.elongates rapidly and becomes perpendicular to the earlier axis of coiling. The
proloculus is minute and measures 105
to 145 microns in outside diameter. The
height of chambers of the first to fourth
volutions are 88, 106, 53 and 123 microns,
respectively.
The spirotheca very thin, its structure
obscure but seems to be composed oftectum, diaphanotheca and lower tectorium in outer volutions. The total
thickness of first to third volutions 17.
22 and 22 microns, respectively. The
septa more thinner than spirotheca, unfluted throughout the shell.
The chomata are observed faintly onlyin the inner volutions.
Remarks: Rause1·ella sp. resembles
more closely Rause1·ella fujimotoi n. sp.
than Rauserella erratica DmmAR in thefollowing points ; subangular peripheryand smaller size of the inner volutions,more elongate in form, larger proloculus.
Unfortunately, the writer has been able
to make only two axial sections and nocross sections, therefore specific naming
has been withho:d.
Locality and Occttr1'e1zce: The specimens occur in the Ibuki-yama limestone
formation at the ridge about 250m. to
the west of the top of Mt. lbuki. where
it is associated with Neosclzwagcrina sp.,
Schwagerina japonica ( GuMREL), Parafusulina sapperi (STUFF) and Sclwber_tella cf. pltairayensis (CoLA:\1).
Rauserella ? sp.
PI. 32. fig. 10-12.

Shell rather large for the genus, elon-

227

gate irregular in form, shell of five
volutions, 2.6 mm. long and 0.83 mm.
wide: its form ratio is 3.2. Inner volutions ellipsoidal in form. next gradually
becoming elongate ellipsoidal, the lastirregular in outer shape. Proloculus
minute. its outside diarreter 12 microns,height of volutions of the second to
fourth volution are 95, 106 and 145
microns, respectively.
Spirotheca thin, probably compo~edof tectum, diaphanotheca and innertectorium, 16 microns in total thickness
and almost uniform throughout. The
septa unfluted, chomata uncertain.
Remarks: The two following characters of the present specimens as, lacking inner discoidal volutions and theunchangings axis of coiling do not sufficefor placing the specimen in the genus
Rauserella. Considering the irregularouter volutions, appearance of septa,
and the structure of spirotheca. it isevident that the present specimens arecloser to Rauserella than to any otherknown genus of the Fusulinidae. Therefore. the writer tentatively refers themto Rauserdla.
Locality a1td Occun·euce: From theUpper Ibuld-yama limestone formation,at the ridge about 200m. to the westof the top of Mt. Ibuki, where it is associated with Schubcrtella sp. andPseudofusulina sp..

References
KAN!'.IERA. K. (1~54), Fusulinids from theUpper Permian Kuma Formation, South·
ern Kyushfi, Japan. with Special Reference
to the Fusulinid zone in the Upper Permian of Japan. Mem. Pac. Sci., Kyushu
l!uiv., Ser. D. Vol. IV. pp. 4-5, Pl. 3, fig.
13.
MoRIKAWA. R. (1955), Schwagerininae in theVicinity of the Shomaru Pass, Eastern

228

Manabu KOBAYASHIPart of Kanto Mountainland, Central• Japan. Sci. Rep., Saitama Univ.. Ser. B,
Vol. 1!, No. 1, p. 61.

THOMPSON, !\I. L. (1948), Studies of American•
Fusulinids. Univ. Kansas Pa/eont. Cont.,.
Protozoa, Art. I. p. 32, Pl. 3, figs. 1-5.

Explanation of Plate 32
Figs. 1-7, Rauserella jujimotoi KoBAYASHI n. sp.
1. Axial section of holotype, Reg. No. 20501
2, Sagittal section of paratype, Rag. No. 20502
3-4, Excentric sections of paratypes, Reg. No. 20503, 2050 ~
5-7, Tangential sections of paratypes, Reg. No. 20505, 20506, 20507
Figs. 8-9, Rauserclla sp.
8, Axial section, Reg. No. 20508
9, Oblique section, Reg. No. 20509
Figs. 10-12, Rauserella ? sp.
10, Tangential section, Reg. No. 20510
11-12, Axial sections, Reg. No. 20511, 20512
1-)0 (X 30), 11-12 (X 20)(All of the specimens are deposited in the collection of Tokyo University of Education}

Plate 32

M. KoBAYASHI: Rauserella from Ibuki-yama

6
2

1

7
5

3

9

4

8

11

12

Trans. Proc. Palaeont. Soc. japan. N. S .. No. 23. pp. 229-234, Pl. 33. 1 text-fig., Aug. 31. 1956

295. A FOSSIL FAUNA FROM THE NO~THERNPART OF THE T ANZA WA MASSIF.MATSUTARO SHIBATA*
Kyobashi Upper Secondary Chemical School:l'tiRu.t:!'t~trml1>f~El:. --:JI. ·-c: 195>1 ~E ~;a-(t. ftiRilltlt:fttma-~~1lt-t ~nt~a- ;t t-:.. -t:-q)~,i'J.--:J-c .:::.±7J:ftEHl1W L t..:ttf!a. to .l:i"11>ilf'tjfrtJ, G. ~g) .l: ~ t.t!Wl~1tEa-:J*:m t..t.::. -t:-q)? '!;,.
-mHt*Tfll! c .l!iht\.:6 qJ"(;m-a--t :6. Clzlamys kanelzarai (YoKOYAMA). Chlamys kamtogawaet~sis
nov. sp., Lima (Lima) cfr. kotmoi OTtrKA. Vettericardia sp. indet .. Haliotis sp. indet.. Spines of
Echinoidea, Smaller-foraminifcras, Calcareous algae, etc.
~EE~*i1r.

v:.

in the Institute. Messrs. Masae 01\toRI
and Shigeru AoKI of the same Institute,
Mr. Kiyoshi KoiKE of the Geological
Institute, University of Tokyo, Mr. Keizo
MIKAMI of the Geological Institute. Faculty of Liberal Arts, Yokohama Na tiona! University, Mr. Yukio KmvANo of
the H.esearch Institute for Natural Re-

In the course of study on the geologyof the northern part of the Tanzawa
massif since the summer of 1954, thewriter collected several molluscan fossils
which are described herein. The area
surveyedis situated at the south-westernend of the geological map of Hachioji(1: 75,000). At the south-western endof this area, around Kanetsukiyama, several new fossil localities
were found. All of the localities
seem to occupy the middle partof the undifferentiated Misaka
series of MITSUCHI (1932). however, the precise stratigraphic
position is not yet to be workedout
AcknowledgL•ments
For suggestions and help inmany ways the writer ·wishes tothank the following gentlemen.
Prof. Haruyoshi FtrJIMOTO of theInstitute of Geology and Mineralogy, Tokyo University of Education for the permission to study

Text· fig. 1.
1\lap showins the fo.>sil bcalitic.>.

* Read June 18, 1955; received Nov.
19, 1955.

229

Matsutaro SHIBATA

230

sources, and to Mr. Reiji SmNoKI of
the Fukada Geological Institute. Prof.
Kotara HATAI for kindly reading thismanuscript.
Fossil localities and Modeof Occurrence

The fossil localities are all situatedaround Kanetsuki-yama above mentioned(Text-fig. 1.). Some of these localities
have previously been recorded by MITSllCHI, who reported on the occurrenceof:-Pecten sp. from Kaizawa, eastern foot of
Omuro-yama, Doshi-mura, Minamitsurugun, Yamanashi Prefecture: Halfway up
the east side of Kanetsuki-yama, Aonemura, Tsukui-gun, Kanagawa Prefecture,? Pltoladomya cfr. PuscM Goor.nFuss,
Ditto.
Litlwthamnimn sp. Ditto.
Among the mentioned fossils, Pecten
sp. was subsequently determined by
KuRoDA (1931) as Chlamys katzelzarai(YOKOYAMA).
The species discriminated by the writer
are as follows :Localities in Text-fig. 1.

1.

2.
3.

4.
5.

Chlamys kaueharai (YoKOYAMA) ............ abundant
Ch/amys kauuogawae11sis SHIBATA, n. sp.... rare
Lima (Lima) cfr. kom10i OTUKA ............... ''Vcucricardia sp. indet.... ... ... .... .. .. .... ... .. . ... II
Ha/iotis sp. indet .................................. abundant

6. Spines of Echinoidea ... .. ... ... ... ... ... ... ...... II
7. Smaller Foraminiferas .. . ... ... ... .. . ...... .. .... ''8. Calcareous algae .. .. .. ... ...... ... .. .... ... .. .... ... 11
Among the above mentioned fossils
all except numbers 6-8 were collectedfrom boulders.
Geolo~rical Horizon andAge

The geological horizon from which
the fossils were collected is judged to
be in the middle part of the undifferentiated Misaka series of MITsucm.
The geological age from the occurrence of Chlamys kmzeharai (YoKoYAMA)
and Lima cfr. komzoi 0TDKA is assumed
to be not older than lower Miocene.
Systematic Description

Genus Chlamys RoDil'G, 1798

Clllamys lwtzeharai (YoKOYAMA)
Pl. 32, figs. Sa, Sb.

xl

x2

x3

x4

x5

x6

x7

X

X

X

X

X

X

X

X
X
X
X

X

X
X
X

1926. Pecteu ka11eharai YoKoYAMA. four. Fac.
Sci. Imp. Univ. Tokyo. Sec. ll, vol. 1, Art.
4. pp. 135-136, pl. VIII. fig. l, pl. XIX.
figs. 1. 2. 5-7.
1936. PecletJ kamlzarai No:-.n;RA and HATAI.
Saito Ho-on Kai Mus., Res. Bull.. No. 10.
p. 119, pl. 13. figs. 3, 4.
1937. Pecte11 (Ciz/amys) katleharai NoMt:RAand HATAI, Ibid .. No. 13. p. 127. pl. 18,
figs. 1, 2.

Shell large, right valve more inflated
than the left. with 18 radial ribs, interstices deep and more or less broader
than the ribs, ribs high elevated, round,
divided into three parts by two longitudinal furrows, central part broader
than the sides and elevated ; three radial
riblets in interstices, central one broadest, the others weak or sometimes obsolete. Radial ribs and riblets more orless scaly. Posterior ear triangular,
truncated behind ; surface sculptured by

A Fossil Fauna from the Northern Part of the Tanzawa Massif

231

Dimensions:Reg. No. 7661*
Reg. No. 7662*
Reg. No. 7663*

HeightSO.Smm95.2
111.5

several radial ribs and concentric growthlines. especially remarkable on the posterior margin.
Remarlls:-Many fragmental specimens
were obtained. According to T. NAGAO.
the differences between C. kanelzarai
and C. ashiyaensis are the inflation ofboth valves. That is, in the former theright valve is inflated, while in the latter the left valve is inflated. Moreover,the sculpture of tbe right valve cf theformer and the left valve of the latteris nearly the same. Comparing with C.
ashiyaet~sis, however, the radial ribs of
the right vahe of C. lwmharai are remarkably elevated and the interstices
are deep and somewhat broader than
the ribs.
Locality:-Idozawa, Aone-mura, Tsukuigun, Kanagawa Prefecture; Kaizawa,
Doshi-mura, Minamitsuru-gun, Yamanashi Prefecture.

Chlamys kamrogawae11sis SHIBATA, n. sp.
Pl. 32, figs. 4a. 4b.

Shell small, oval in outline, higher
than long, inequilateral, test thin, moderately convex. umbonal angle 78 degrees.
Right valve :-Antero-dorsal margin
long and straight, postero-dorsal margin
short and straight; antero-ventral margin narrowly round, postero-ventral
margin broadly rounded ; surface sculptured by many radial ribs and grooves
alternatively: ribs 24 in number, broader* Ali of the specimens are preserved in thecollection of the Institute of Geology andMineralogy, Tokyo University of Education.

Length

Depth
Umm
12

Number of rib
17

18

18

than intercalaries, elevated and its top
somewhat roundly flattened ; the surfaceof the ribs are smooth, not divided :the bottom of the intercalaries are flat,
sometimes one weak radial riblet present.
Ears unequal, anterior longer than theposterior, one and a quarter times ofthe posterior in length. Hinge length
about 2/3 times of the shell length.
Byssal notch narrow and deep. Ctenolium present. On the surface of theears respectively 5 radial ribs present.
Posterior ear triangular. truncated rectangularly behind.
Dimet~sions:-Reg.
No. 7664, Monotypic. Height 37.5 mm, length 28.5 mm,hinge length 19 mm. depth 15.2 mm,
length/height 0.76
Compariso1ls and atlinities:-Thisspecies is allied to Pecten lwkisakietzsis
NoMURA and NII:-;o and Chlamys nobilis(REEVE), but the present specimen differs from the former by the following
points, that is, 1) being higher thanlong, 2) narrow umbonal angle, 3) having 24 ribs, 4) surface of the ribs smooth,5) ribs not divided, 6) radial riblets on
both ears, 7) hinge length reaches to
2/3 times of disc length ; and this species is discriminated from the latter by
the following points, that is, 1) inequilateral, 2) narrow umbonal angle, 3) ribs
broader than interstices, 4) sometimes
one weak radial riblet present in interstices, 5) ribs surface smooth and simple, 6) ribs are rounded.
Remarks:-The specimens are repre·
sented only by exterior mould and castof the right valve.
Locality:-Idozawa, Aone-mura, Tsu-232

l\Iatsutaro SHIBATA

kui-gun, Kanagawa Prefecture.
Genus Lt"ma BRuGUIERE, 1797
Lima (Lima) cfr. lwmzoi 0TUKA

A cast sculptured with external surface.
Locality:-Idozawa, Aone-mura, Tsukui-gun, Kanagawa Prefecture.

Pl. 32. fig. 3.

Genus Haliotis LtNNAEUS, 1758
1938. Lima komzoi OTt:KA, four. Fac. Sci. Imp.
Utziv. Tokyo. Sec. II, pt. 5, No. 1. p. 11,
pl. l, fig. 8.
1943. Lima (Lima) komzoi TAKI. OTU<A and
SUZt:Kl. Conch. Asiatica vol. 1, p. 58,
pl. XII. fig. 3. pl. XIV. fig. 15.

Shell medium in size. elongated ovalin outline, inequilateral, inflated, anterior
dorsal margin long, almost straight,
antero·ventral margin narrowly rounded;
postero·dorsal margin very short, postero-ventral margin broadly rounded;
anterior ear indistinct, posterior ear
remarkable, larger than the anterior ;disc elevated rectangularly at the anterodorsal extremity, then elevated gently,
being highest at the central portion,then gradually decends towards tl:eposterior dorsal margin : exterior surface
with about 35 narrow, smooth, roundedradial ribs separated by flat interspaces;
concentric growth lines remarkable atthe antero-ventral submargin.
Dimension:-Reg. No. 7665. Height
60 mm, length 40 mm, depth 16 mm.
Comparisons and affinities:-The present specimen is closely allied to Lima(s. s.) komwi 0TVKA in its outline andthe convexity, but it differs from L.
komwi by its larger size.
Remarks :-This specimen is represented by only one left valve and lacks
the umbonal area, but the base of theposterior ear is visible.
Locality:-Idozawa, Aone-mura. Tsukui-gun, Kanagawa Prefecture.
Genus Venericardia LAMARCK, 1801
V enericardia sp. indet.

Haliotis sp. indet.
Pl. 33. figs. 1. 2.

Two comparatively well preserved andmany fragmental specimens were obtained. All are external casts.
The surface of these specimens are
sculptured by multiple radial and concentric lines. The curvature of theconcentric lines of the umbonal area arestrongly rolled.
Locality :-Halfway up the east sid~ of
Kanetsuki·yama, Aone-mura, Tsukuigun. Kanagawa Prefecture. Reg. Nos.
7666, 7667.
Literature cited
GRA~T. H. S., and GALE. R. (1931),

Plioceneand Pleistocene Mollusca of California,
Mem. San Diego Soc. Nat. Hist., vol. 1.
HABE. T. (1951), Genera of Japanese Shells,
Pelecypoda, No. 1. (in japanese)l\IITSUCHI, T. (1932). Hachioji. Explanatory
Text of the Geological Map of Japan(Scale 1: 75,000) zone 24 col. VI. sheet
113. Imp. Geol. Surv. Japan.
NAGAo. T. (1928). Palaeogene Fossils of theIsland of Kyushu, Japan. Pt. II, Sci. Rep.
Tolzokzt Imp. Univ, 2nd Ser.. vol. X/1.
No.1.
NOMURA. S. and NllNO. H. (1932). Fossil
1\lo!lusca from Izu and Hakone. Ibid., vol.
XV. No.3.
NoMURA, S. and HATAI. K. (1936), Fossils
from the Tanagura Beds in the Vicinityof the Town Tanagura. Hukushima-ken,
Northeast J-lonsyu. Japan. Saito Ho-on Kai
Mus. Res. Bull.. No. 10. p. 119, pl. 13,
figs. 3, 4.
& (1937). List of the Miocene Mol-A Fossil Fauna from the Northern Part of the Tanzawa Massif
lusca and Brachiopoda Collected from theRegion lying North of the Nanakita
River in the Vicinity of Sendai, Rikuzen
Province, Japan. Ibid .. No. 13, p. 127. pl.
18, figs. 1, 2.
1\oMt:RA, s. (1940), Molluscan Fauna of the
1\loniwa Shell Bed exposed along the~atori-gawa. Sci. Rep. Tohokl4 Imp. Univ.,
2tzd Ser., vol. XXI, No. 1, p. 18.
OTUKA. Y. (1938a), Neogene Fossils of the
Ihara District, Sizuoka Prefecture. Japan.
four. Fac. Sci. Imp. Utziv. Tokyo, Sec. /1,
vol. 5. Pt. 1.
- - (1938b), A Fossil from the middle formation of Misaka s:!ries. (in Japanese).
]our. Geol. Soc. ]apmz. vol. 45. No. 536,
p. 424.
REEVE, L.A. ( 1855). Conch. Icon.. vol. VIII.
Pectm Xo. 64, pl. XVIII, figs. 64a. b.

233

SoWERBY, G. B. (1847). Thes. Conch .. 1, p. 75,

No. 92, pl. XV, fig. 111. pl. XVII.
TAKI, I. 0TtJKA. Y. and SUZUKI.

K. (1943),
Conch. Asiatica vol. 1. (in Japanese)
YABE. H. (1920), Tertiary rocks with Higher
Foraminifera from Japan. (in Japanese)jour. Ceo!. Soc. ]apmz. vol. 27. p. 377.
YoKoYAMA, M. (1920), Fossils from the Miura
Peninsula and its Immediate North. jour.
Coli. Sci. Imp. Univ. Tokvo, vol. 39. Pt. 6,

p. 118, pl. XII. fig. 8.
- - (1926), Tertiary Mollusca from Shiobara
in Shimolsuke. jour. Fac. Sci. Imp. Utziv.
Tokyo. Sec. Il, vol. 1. Pt. 4, pp. 135-136,
pl. VIII. fig. 1. pl. XIX. figs. 1. 2. 5-7.
- - (1927), On the Occurrence of Lower
Tertiary Formation in the Province of
Hoki. four. Geol. Soc. ]apau. vol. 34. p.
13, pl. 8.

23t

l\'latsutaro SHIBATA

Explanation of Plate 33(All figures in natural size unless otherwise stated)

Haliotis sp. External cast.
From ldozawa. Aone-mura, Tsukui-gun, Kanagawa Prefecture. Reg. No. 7666 (Inst. ofGeol. & !\lin., Tokyo Univ. of Education)
Fig. 2. Ditto.
Reg. No. 7667 (Inst. of Geol. & Min., Tokyo Univ. of Education)
Fig. 3. Lima (Lima) cfr. kotmoi OTSUKA. Left valve.
From Idozawa, Aone-mura. Tsukui-gun. Kanagawa Prefecture. Reg. No. 7665 (Inst. ofGeol. & Min .. Tokyo Univ. of Education)
Fig. 4a. Chlamys kamwgawaetiSis SHIBATA. n. sp. Internal mould of right valve.
From Idozawa, Aone-mura, Tsukui·gun, Kanagawa Prefecture. Reg. No. 7664 (Inst. ofGeol. & Min .. Tokyo Univ. of Education)
Fig. 4b. Ditto.
External cast of right valve.
Fig. 5a. Chlamys katteharai (YoKoYAMA). Internal mould of left valve. x 0.74
From Kai?.awa. Doshi-mura. Minamitsuru·gun, Yamanashi Prefecture. Reg. No. 7661 (Inst.
of Geol. & Min .. Tokyo Univ. of Education)
Fig. 5b. Ditto.
External cast.
Fig. 1.

M. SHIBATA : A Fossil Fauna from Northern Part of Tanzawa

Pla te 33

3

5a
1

4b

Trans. Proc. Palaeont. Soc. japan. N. S., No. 23. pp. 233-242. Pl. 31. 1 text-fig., Aug. 31. 1956

296. NEOSCHW AGERININAE FROM THE SHIMAPENINSULA, JAPAN*NOBUO YAMAGIW A
Osaka University of Liberal Arts and Edu:ation~,f,W! J: IJ i$.1' .Q Neoschwagerininae :..:. "?\'"( :~:t\':t ~Wl iil,t Neo3chwagerininae ~!iif!jl:!f.

fJit.:.::. Cancellina ~r:f:! 1 f!!l, Neoschwagerina }Ill, >p 2 f!!j1) 3 ~lii~5eJii!. 1.., t..:o:>-e . .:. .:.1:.\ia',JlX~H!r~~0~

Neoschwagerininae from the Shima
Peninsula was already reported by FuJI:.-.mTo and MATSUSHITA. Namely, Neosc/zwagerina cf. craticurifera (S.) andothers were discovered by FuJil\IOTO(1942) at the Kusakidani limestone,
Isobe-cho, and Neoschwagerina cf.
craticurifera (S.) and Neosclzwageri11a
sp. were discovered by MATsusmTA(1953) at the Kageyama and Koshik'iiwa
limestones, lsobe-cho.
Since 1951, 1 have been studying thegeology of the Shima Pen·insula andmeanwlrile have discO\·ered newly Neoschwagerininae from the Futaji limestone, Arashima-cho, Toba-city and the·Urayama limestone, Shiraki-cho, Tobacity. The formation containing the
Urayama limestone consists in thenorth side of Arash·ilna-Gokasho tecton'tc
line and is composed of sandstone, shale,chert, sclmlste·in and limestone. This
formation has hitherto been regarded
as the equivalent to Pseudofusulina
zone, but as the result of the present
study, I have furthermore discovered
Neoschwage1·ina sp. from the Urayama
limestone. It is suggested. therefore,that not only Pseudofusulina zone, but_also Neosc/zwagerina zone is developed

~

~

~

in this district.
The formation containing the Futaji
limestone consists in the south side of
A.-G. tectonic line and is composed ofsandstone, shale, chert, schalstein, limestone and conglomerate. The formation
is in fault contact with the mesozo·ic
formations of the north and south sides.
As the result of the present study, I
have discovered Yabeitza cf. lwtoi (0.)
and Schwagerininae gn. sp. indet. fromthe Futaji limestone. It is suggested,
therefore, that Yabeina zone is developed in this district.
The formation containing the limestones of the Kusalddani and Kageyama
consists in the south of the formation
containing the Futaji l·imestone and isin fault cont2ct with the mesozoic formations of the north and south. This
formation consists of sandstone, shale.
chert, schalstein and l'imestone. I havediscovered Neoschwagerina fujimotoi
YAMAGlWA n. sp., N sakaguchii Y. n.
sp., N. sp, Cancellina matsuslzitai Y. n.
sp., C.? sp., Sclmbertella sp. and Foraminifera gn. sp. ·indet. from the Kusakid~ni limestone and N fujimotoi Y. n.
sp., N. sp., C. matsushitai Y. n. sp.,
Pseudodoliolina sp., Sclzubertella sp. andForaminifera gn. sp. indet. from the* Read Oct. 29. 1955; received, Dec. 9, 1955
235

Nobuo YAMAGIWA

236

Locality Map.
Loc. 1 Urayama,Loc. 2 Futaji.

Kageyama l'imestone. It is suggested
that Neoscltwagerina zone is developedin this district.
The said formations strike N 50°-70"Eand dip 50°-70°N.
I wish to express my cordial thanks
to Prof. H. FuJIMoTo of Tokyo University of Education for his kind ad vices
and for. his kindness of reading themanuscript of th·is paper. I also wish
to express my hearty thanl\:S to Prof.
S. MATSUSHITA of Kyoto University, who
permitted me free use of the library of
his Department, to Assist. Prof. S.
SAKAGUCHI of Osaka University of Liberal Arts and Education, Assist. Prof. R.
MoRIKAWA of Saitama University, Lee-Loc. 3 Kusakidani.

Loc. 4· Kageyama

turer K. NAKAZAWA of Kyoto University, Mr. IsHII of Osaka City University,
Mr. Y. KusAKABE and Mr. T. SHIKI of
Kyoto University and Mr. M. KoBAYASHI
of Tokyo Uni\·ersity of Education for
their discussions of the species included
in tlris paper.
Subfamily Neoschwagerininae
DuKRAR & CoNDRA, 1928
Genus Cancellitta HAYDES, 1909

Cancellina matsushitai YAMAG rw A n. sp,
Plate 34. Figs. 1-4

Desc1·iption :-The shell is small and237

Neoschwagerininae from the Shima Peninsula. Japanis elliptical in shape, but the species isthicker spirotheca and smaller shellthan C. tzipponica. ·The proloculus ofCancel/ina matsushitai is smaller thanholotype of C. primigena. It is similar
to Cancel/ina tosayamensis, but thelatter is larger shell than the former.
The present form is distinguished bysmaller shell and shorter form ratio
than Cancellitta kobayashii. This species
also can be distinguished from the said
4 species of Cancellitza by the respectthat the first Yolution of the former is
evolute.
Occurrence :-This species was foundin Kusakidani and Kageyama, Isobe-cho,associated with Neoscltwageritza fujimotoi, N sakaguchii, Cancellina ? sp.
and others.
Holotype :-I. A. G. G.* Osaka University of Liberal Arts and Education. No.
54001 (pl. 34, fig. 1).
Paratypes :-do. Nos. 54002, 54003, 54004.

elliptical with straight axis of coi.ling,somewhat row1ded poles. The mature
specimens are generally 6 to 7 volutions.
The specimen of holotype is 1.24 m111
long and 0.94 mm wide, giving form
ratio of 1.3. The co·iling sho\vs gradualincreasing from the first volution. The
first 2 volutions have short axis ofcoilling, and the first volution is e\•olute.
The 3rd to last volutions have longaxis of coiling. The proloculus is rather
small and subspher"ical, and the outside
diameter is 0.06 mm to 0.10 mm. The
spirotheca is composed of a tectum andkeriotheca, and the thickness of thelast volution is 0.04 m111 to 0.06 mm.
The septa are straight, and the countsof the 3rd to 6th of a typical specimen
are 11 (?), 13, 16 and 20. The transverse septula are present, but the axial
septula and secondary transverse
septula are absent.
Comparison :-Cance/lina matsushitai
Table 1.

Measurement; of Catzcel/itla matsushitai YAMAGIWA n. sp. in millimeters.
Rate of growthSpec. Fig.
1
2
3
4

2
3
4

L.

w.

R.

P.

1

2

3

4

5

6

7

1. 24

0.94

1.3

0.06
0.10

0.20
0.28
0.20

0.31
0.39
0.31

1.25

0.41
0.55
0.43
0.39

0.76
0.61
0. 59

0.73
1. 08
0.82
0.84

0.94

o.os

0. 14
0.17
0. 14

0.56

1. 08
0.82
0.84

7

1.5

Form ratio of volutions
Spec.
1
2
3
4

0.6

Thickness of spirotheca

2

3

4

5

6

7

0.9

1.1

1.4

1.5

1.4

1.3

1.4

1.4

1.5

Genus Neosclzwagcritza YABE, 1903

Neoschwagerina sakaguchii
YAMAGIWA D. Sp.

Plate 34. Figs. 5-10, 17

Description :-The shell is medium,

1

2

3

4

5

6

0.02
0.02
0.02

0.03
0.04
0.02
0.02

0.02
0.04
0.04
0.04

0.04
0.04
0.06

somewhat elongate, elliptical fusiform
and subspherical in the first 2 ot· 3
volutions, and beyond the 3rd or 4th
volution the shell assumes mature* Institute of Astronomy, Geophysics andGeology.

Nobuo YAMAGIWA

238

per~(eraand N. fujimotoi are more ·inflated thnn this species. The latter iselongate form than the former. This
spec·ies resembles Cancellina nippouica,
but the former _has th·icker spirotheca,
smaller proloculus and larger shell thanthe l::>.tter. Th·is species also 1s distingtrished from the s<rid species ofCanccllina ·in the respect that the axial
septula of the former appear in more
early volution than the latter.
Occurrence_ :-Th·is is from Kusakidani,
Isobe-cho, associated with Neosc!twageri1la fujimotoi, Ca11ccllina matsusliitai
and others.
lfolotype :-I. A. G. G., 0Faka Urriversity of Liberal Arts and Education. No.
54005 (Pl. 34, fig. 8).
Pamtypes :-do. Nos. 54006, 54007, 54008.
54009, 54010, 54011.

shape. My specimens have 9 to 12 (?)
volutions. The specimens of 10 volut-ions are 3.67 mm to 4.53 mm long and2.24 mm to 2.56 mm wide, giving form
ratios of 1.7 to 1.8, respectively. The
proloculus is small nnd subsphedcal,with the outs·ide diameter of 0.03 mm.
The spirotheca is rather tlrick, increasing gradually from the first one,and the thickness of the ultimate or
penultimate is 0.06 mm to 0.10 rnm.
The spirotheca is composed of a tectumand keriotheca. The septa are straight,
and the count is about 14 or 15 ·in 7th
volution. The transverse septula occur
throughout the shell. The ax·ial spctula
are present, and there are one septulum
between the adjacent septa ·in the 5th
to last volutions. The secondary transverse septula are absent.
Compariso1Z :-Neosclm:agerina cratiTable 2.

~'leasurements of

Spec.
2
3
4

5

Neosclzwageriua sakaguclzii YAMAGIWA n. sp. in millimeter;;.

Fig.

L.

w.

R.

P.

8
7
5
10
6

4.53
4.39
3.75

2.45
2.57
2.24
2.39
1. 86

1.8
1.7
1.7

0.03
?

0.06

Rate of growth

Spec.

2

3

4

5

6

7

8

9

10

11

0.20
0.16
0"17

0.41
0.43
0.37
0.37
0.43

0.61
0.63
0.51
0.55
0.65

0.86
0.90
0. 69
0.82

1. 16

1. 55
1. 61
1. 27
1. 57
1. 49

1. 94

2.45
2.57
2.24
2.39

2.68*

1. 20
0. g,j,

2.82

3.35

9

10

11

12

0.08
0.10
0.08
0.09
0.06

0.08
0.09
0.08
0.09

0.06*

5

0.10

0.18

0.28
0.27
0.27
0.25
0.29

Spec.

1

2

3

4

Thickness of spirotheca
5
6
7
8

0.01

0.04
0,02
0.02
0.02
0.02

0.02
0.04
0.02
0.02
0.03

0.04
0.06
0.03
0.04
O.<»

0.12
2

3

0.08

·l

1

2
3
4
5
* 10.5 volutions.

O.ES

0.05
0.06
0.(<3
0.04
0.05

l.H
1. 16

0.05
0.07
0.04
0.06
0.04

0.08
0.07
0.08
0.08
0.06

2.06
1. 70
2.04
1. 86

0.07

12

0.06

239

Neoscinvagerininae from t11e Shima Peninsula, Japan

3

4

1.0

1.5

1.1

1.2
1.4

1.8
1.4
1.7

Spec.

1

2

1
2

1.0

3
4
5

1.1

1.2

Form ratio of volutions
7
6
5

9

10

2.0

1.8

1.8
l.g

1.7
1.7

1.7

2.0

1.5

1.8

2.0
1.9

2.0
1.9

1.8

1.9

2.0

1.9

Neoscllwagerina fujimotoi
YAMAGIWA, n. sp.
Plate 31. Figs. 11-15

Description:-The shell is medium
and e!Hptic21. infl~1.ted fus·iform, \vithstraight axis of coiling. The first 2 or
3 volutions are subspherical in shape,and beyond the 4th or 5th volution theshell assumes mature shape. The
mature specimens have 12 or 13 volubons. My specimens of 12 vclutions
are 4.73 mm to 5.53mm long and 3.25 nun
to 3.65 mm wide. The form r2.tios 2.re
1.5, respectively. The coiling is tightin the first 3 or 4 volutions and gradually becomes loose toward the outerones. The proloculus is small andspherical. with the outside diarnter of
0.04 nm1 to 0.06 mm. The spirotheca
consists of a tectum and keriothec::>.,and in the first 3 or 4 volt1tions it isthin, but thick in the outer ones. The
keriotheca can be seen in the outerones. The septa are straight and thecounts of the 2nd to 8th volutions of atypical specimen are 5. 9, 11, 12. 13. 14
and 16, respectively. They are composedof a tectum and anterior and posterior
downward extensions of the keriotheca
Table 3.

8

11of the spirotheca. The transverse
septula occur throughout the shell.
The axial septula are present, and there
are one septulum between the adjacentseptula in the 4th or 5th to last volutions. The secondary transverse septula
are absent.
Comparison : -It resembles Neoscllwagerina brevis, but the first 2 to 3
volutions of the latter are slightly
evolute, and the outer volutions of thelatter cccur 2 axial septula between
the adjacent septa.
Neoschwagerina
craticzwifera var. ltaydeni is similar totlris species. but the count of the septaof the latter is more few than theformer. The coiling of the outer volutions of Neosclnvagerina fujimotoi islooser than N. craticurifera var. lzaydeni.
This species is more elliptical than N.
margaritae.
Occurrence :-This species was foundin Kusakidani and Kageyama, Isobecho, associated with Neosclzwageriua
sakaguchii, Cancel/ina matsushitai, C. ?
sp., Pseudodolwlina sp. and others.
Holotype:-l.A.G.G. Osaka Universityof Libend Arts and Educ2.tion. No.
54012 (Pl. 34, fig. 14).
Paratypes :-do. 54013, 54014, 54015,
54016.

l\1easurements of Neoschwagerina fujimotoi YAMAGIWA n. sp. in millimeters.
Fig.

L.

w.

R.

P.

1

15

4. 73

3.25

2

14
13
11
12

4.85
5.53

3.35

1.5
1.5

0.06
0.0-l

Spec.

3
4

5

12

8.65
3.92
3.•H

1.5

0.04

240

Nobuo YAMAGnVA
Rate of growth

Spec.

1

2

s

4

5

6

7

8

9

10

11

12

13

1
2
3

0.14
0.10

0.20
0.18

0.29
0.29

0.10
0.10

0.20
0.22

0.31
0.83

0.57
0.57
0.60
0.63
0.57

0.86
0.80
0.86
0.82
o.86

1.14
1. 06
1. 14
1.10
1. 19

1.48
1. -!3
1. 54
1.43
1. 59

1.82
1. 82
2.02
1. 63
2.00

2.28
2.34
2.57
2.29
2.49

2. 7·~
2.85
3.08
2.90
2.94

8.25
3.36
3.65
3.47
3.·U

3.51*

4

0.41
0.41
0.3-l
0.45
0.41

3

4

5

6

7

8

9

10

11

12

13

0.03
0.04
0.06
0.03
0.03

0.05
0.0!0.06
0.04
0.05

0.05
0.06
0.06
0.05
0.08

0.06
0.06
0.09
0.06
0.06

0.09
0.08
0.08
0.08
0.06

0.08
0. 10
0.09
0.09
0.07

0.06
0. 12
0.06
0. 10
0.08

0.06
0.06
0.10
0.08
0.06

0.06•

5

3.92

Thickness of spirotheca
~pee.

1

2

5

0.02

0.02
0.02

0. 02
0.02

0.02
0.02
0.04
0.03
0.02

Spec.

1

2

3

4

5

6

7

8

9

10

11

12

1
2
3

1.0
1.0

1.2

1.4

1.1

1.4
1.3
1.8

1.5
1.3
1. •l

1.5
1.3
1.5

1.5

1.1

1.4

1. 5
1.5

1.5
1.6

1.5
1.5

1.5

1.4

1.4

1.4

1.5
1. I
1.4

1.5
1.5
1.5

1
2
3
4

0.08

Form ratio of volutions

13

4

5

Genus Yabeina DRPRAT, 1914

Yabeina cf. katoi (OzAWA), 1917
Plate 3l, Fig. 16

1927. Neoscfnvagerina katoi OzAWA. Stratigraphical studies of the Limestone of Akasaka. Prov. of Mino. four. Fac. Sci. Imp.
U11iv. Tokyo, vol. II. part. 3, p. 159. pl.
XLI. figs, 1. 10, pl. XLIII. figs. 1a, 2a, 3,
5. 6.
1936. Neosclnvageri11a katoi FuJI~IOTO. Stratigraphical and palaeontological studies of
the Titibu System. Sci. Rep.
Tokyo
Brmrika D., sec. c. 110. 2, p. 118. 119. pl.
XXIV. fi~;:s. 5-8.

Dcscriptiou :-The shell is large andspherical, with straight axis of coiling.
My specimen has 17.5 volutions. The
spedmen of 17 volutions is 5.36 mm
long and 4.45 mm wide, giving form
ratio of about 1.2. The widths of thefirst to 17th volutions are 0.16, 0.29, 0.41,

0.53, 0.69, 0.90, 1.06, 1.31. 1.55, 1.88, 2.18,
2.51, 2.85, 3.19, 3.59, 3.99 and 4.45 mm.
The width of the 17.5 volut·ions ·is
4.67 mm. The form ratios are 1.3 forthe first volution, 1.4 for the 2nd volution, 1.5 for the 3rd to 8th volutions,
1.3 for the 9th to 13th volutions and
1.2 for the 14th to 17th volutions. The
spirotheca and septa are thin, and theformer consists of a tectum and kenotheca. The thickness of the spirotheca
is about 0.02 mm in the thickest ones.
The transverse septula occur throughout the shelL The secondary transverse
septula first appear in lOth (?) volution,and there are one septulum between theadjacent transverse septula in the lOth(?) to last volutions. I am sorry I haveno cross section. Therefore, the septa
and axial septula can not be seen.

* 12.5 volutions.

Neoschwagerininae from the Shima Peninsula. Japan

Comparison :-Formerly, this species·was reported by OzAWA (1927) andFuJIMoTo (1936). The present form.closely agrees with OzAwA's originallllustration, but smaller than the latter.
Also it resembles FuJIMoTo's specimens,
but the coiling of my specimen is somewhat tighter than his specimens.
·OzAWA's and FuJIMOTo's specimens andmy specimen have thin spirotheca andsepta, secondary transverse septula.
Therefore, this species is referred to
Yabei11a.
Occurrence :-This species was found·in Fntaji, Arashima-cho, Toba-citv, associated with Schwagerininae gn. sp.
indet.
I. A. G. G. of Osaka University of
Liberal Arts and Educr>.tion. No. 54017.

References
Cor.A~I

i\L (1921), ~ouvelle contribution ii!'etude des Fusulinides de !'Extreme
Orient : Indochi11e Service Ceo/., Jl,[em .. vol.
ll,fasc. 1. (After Catalogue of Foraminifera by ELI.!S and 1\lESSINA)
DErRAT. J. (1912). Etude des Fusulinides deChine et d' Indochine et classification de;;calcaire;; a Fusulines: bzdochine Service
Ceo/., Mem., vol. 1, fasc. 3 (After Catalogue of Foraminifera by ELLIS and :ME·
SSI~A).- - (1913), Le;; Fusulinides des calcaires
carboniferiens et permiens du Tonkin,
du Laos et du Nord·Annam: lndochitlil
Service Ciol., Mem., t·ol. 2,jasc. 1. (After
Catalogue of Foraminifera by ELLIS and~lESS INA)--- (1914), Etude comparative des Fu:;ulinides d'Akasaka (Japon) et des Fusulinide:; de Chine et d' Indochine: lndochine
Service Cio/.. 1\.fem., vol. 3. jasc. 1. (After
Catalogue of Foraminifera by ELLis andl\lESSINA)
DOUTKEVITCH, C. A .. & KHABAKoV. A. B.
(1934). Permian faun:~. of Fu;ulinidae
found in the section; of Kara·su and241

Kuberganda in East Pamir: Acad. Sci.
U.S.S.R., Tadjik Complex Exped. 1932.
Ceol. Pamir. vol. 8 (After Catalogue ofForaminifera by ELLIS and MESSINA)
FuJIMOTO. H. (1936). Stratigraphical andpalaeontological studies of the Titibu
system of the Kwanto·Mountainland.
Part. 2. Palaeontology : Tokyo Bunrika
Daigaku, Ceo/. I11St .. sec. c, no. 2, vol. 1.
- - (1942). Geology of the Toba Area. Mie
Prefecture (Abstract) (in japanese):]our. Ceo/. Soc. Japan. vol. XLIX. 110. 585.
HAYDEN. H. H. (l!J09). Fusulinidae from Afghanistan : India Ceo/. Servey, Records.
vol. 38 (After Catalogue of Foraminifera
by ELLIS and MESSINA)
l!ZtJKA Y. (1928). Explanatory text of geo!.
map of Japan. Toba sheet. Scale 1 :75000(written in japanese with English re·sume) : Ceol. Surv. Japan.
LANGE, E. (1925), Eine mittelpennische Fauna von Guguk Bulat (Padanger Oberland.
Sumatra) : Ceo/. -mijtlb. getzootsch. Nederlatld a11d Kolat1ien, Verh .. Ceo/. ser., Deel 7(After Catalogue of Foraminifera by ELLis and MESSINA):;\{ATSUSHIT A. S. (19!'3). Kinki District. Regional geology of Japan (in Japanese):
Asakura Book Co.
OzAWA. Y. (1922). Preliminary notes on theclassification of the Family Fusulinidae(in Japanese): Ceo/. Soc. Tokyo, jour., volXXIX.
- - (1925a). On the classification of Fusulin·
idae: Tokyo Imp. Univ., Coli. Sci., ]our..
vol. 45. art. 4.
- - (1925h). Palenotological and stratigraphical studies on the Permo-Carboniferous
lime~tone of Na2:1.to. P::trt II. I'alaeon·
tology: Tokyo Imp. lft1iv., Coli. Sci .. ]our..
vol. 45, art 6.
- - (1927). S'.:ratigrap~ical studies of theFusulina limestone of Akasaka, Province of
Mino: Tokyo Imp. U11iv .. Fac . .Sci.. jour.,sec. 2, vol. 2. pt. 3.
ScHWAGER, C. (1883). Carhonische Foraminiferen aus China unci japan: vo11 Richthoje11's Chitta, vol. 4 (After Catalogue ofForaminifera by ELLIS and MESSINA)
TIIO!\IPSO:-<, M. L. (1948). Studies of American

242

No:1uo YAMAGIWA
Fusulinids: U11iv. Kat1sas, Pa/eont. Contr.
Protozoa, Art. 1.

--.

WHEELER. H. E., and DANNER. W. R.
(1950). Middle and Upper Permian fusulinid:; of Washington and British Columbia. Cushman Found. Foram. Res ..
Con/rib .. Washington. D. C.. vo/. 1, pts. 3-4(After Catalogue of Foraminifera by ELLIS 'and MESSINA)

ToRIYAMA. R (1947). On some Fusulinids·from Tosayama. Koti·ken.-Sikoku. with anote on the stratigraphical range of

Neoschwageri11a. : ]apa!zese -jour. Geol.
Geogr., vol. 20, nos. 2-4,
YAMAGIWA. N. (1955). l\1esszoic and palaeozoic formations from the Shima Peninsula.
Japan (Abstract) (in Japane~e): ]our.

Geol. Soc. japan. vol. LXI, 110. 718.

Explanation of Plate 34
Figs. 1-4. Cancel/ina matsusltitai YA:MAGIWA n. sp.: 1 Axial section (x 20). 2. 3. Cross section( x 20). 4. Tangential section ( x 20).
Localities: 1. 2. 4, Kusakidani. Isobe-cho. S: Kageyama, Isohe-cho.
Figs. 5-10, 17. Noscizwagerina sakaguchii YAMAGIWA n. sp. 5. 8, Axial sections (x 10). 6. Cross· section ( x 10). 7. 17: Tangential sections ( x 10). 9. 10, Parallel sections·( x 10). Locality:
5-10. 17. Kusakidani, Isobe-cho.
Figs. 11-15. Neoschwagerina fujimotoi YAMAGIWA n. sp. 11. 12. Cross sections ( x 10). 13 Tangential section ( x 10). B. 15. Axi:l\ sections ( x 10).
Locality 11-15. Kusakidani. lsobe·cho.
Fig. 16. Yabeina cf. katoi (0zAwA).16. Axial section (x 10). Locality: Futaji. Arashim:1, Tobacity.

N. YAMAGIWA: Neoschwagerininae from Shima•

14

S. AoKI Photo

Plate 34

3

•

6

•

Trans. Proc. Palaeont. So::. Japan. N. S., No. 23. p;>. 213-215. ltext-fig .. Aug. 31. 1956

297. AN INTERESTING NEW FORM OF THE ATURIDAE FROM
THE PALAEOGENE OF NORTHERN KYUSHU*TEIICHI KOBAYASHI
Geological lnsitute. University of Tokyo::It:Mili!i'!!P.;~*lili Aturidae V')~il..f<:t<, ~:mm: rt.1!U1JYi!Jll!~Hll\:::t:ttiBT~~a~PR~c:Uli:t5~'llll:7di~~1J,J?imff:IL.t..:~{l::1:il'i (1) ~~V')iiJi'lffj;D:~ilifl:Hil!=:~~-e (2) W.ljlfl"t'f~~l::f::JL (3) i>1~V')j)jij~(tj;:·;:, ff::J!lii)V');:E_~ UHl!J]V') 1]'!iliJ5Jll:1:.7)-;h. -(\, • ~ .

.:C L -c ('!) 3:!/D4rdll:.~\, ·~:ll:~~.

.::. :tL j;,V')~

1!tv' i?R. -c.::. ;h.(t Aturidae V')ifj'lm, t ~.!§:;{_ l?h ~;b:. f)!i~:;b:~jC.'£f.J:V')~~'f1ll "A Iuria" matsushitai~~-c~~tE~~.

~

Patches of Tertiary sediments arescattered on the nortlm·est and south
east sides of Kyushu islHnd (3,6660 km)
and adjoining isles, but pre-Tertiary
formations and igneous rocks are much
more extensive. occupying roughly ninetenths of the area or more. The Tertimy terrain is not large, but may besaid most prolific of fossil nautiloids inJapan or in Eastern Asia. in view of the
known occurrences of Aturia yokoyamai
and other species including two new
genera (YoKoYAMA, 1911, NAGAo, 1626
ane SmMizu. 1926). One of the two is
Neocymatoceras tsukuslziellse and theother Obinautil us pulclznz ( KouA YASH I,
1955a. b). The third is probably a new
genus of the Aturidae. but I hesitate toerect a genus out of the specimen in
hand, because its preservation is unfortunately insufficient for the genoholotype. Therefore it is simply called"Aturia" matsushitai. This specificname is proposed in honour of Prof.
Hisamichi Matsushit::~ of the Kyushu

#

~

-

University who made valuable contributions to the Palaeogene stratigraphy of
Kyushu. I am obliged to him for studying this interesting nautiloid which hecollected and belongs to the collectionof his geological Institute.

"Aturia" matsushitai KoBAYASIII.
new species
Text-figures a-d.

Desc1·iption :-Shell globular rather
than discoidal, very broad and nautiliconic ; umbilicus very narrow and deep,
if not completely closed. The ventral
part of the last whorl is unpreserved,
but the cross section of the whorl ispresumably subtriangularly ovate and alittle broader than high, being about
55 mm and 47 mm. respectively in widthand median height. The radius of the"·horl may be 50 mm. or so. The siphuncle measuring 8 mm. in diameter inthis section is located marginally on thedorsal side. Flanks ara very gently
convex.
Some 7 septa are distributed in a half

• Read at the annu!ll meeting of this society
at Sendai, Jan. 21. 1956; received Nov. 26
1955.
213

Teiicbj KOBAYASHi

a

b

c

d
Figures a-b. Two views of •· Aturia" matsushitai KoBAYASHI, new species. Natural size.
Figure c. Diagrammatic whorl section of A. matsushilai.
Figure d. Septal suture (line) and interseptal ridge (comb) of A. matsushitai.

of the last whorl. There is a large
lateral saddle on the flank which consists of the main arc and a small outerone. An obtuse median ridge extends
from the junction of the latter arc withthe former and runs through the space
between the sutures. The ridge is aregular angulation seen on the twoflanks in each septal interval. It is·probable to be impressed by the septal

An interesting New Form of the Aturidae from the Palaeogene of Northern Kyushu

adnation on the conch. Whether or not
the surface of the shell is ridged is,
however. as yet indetermined. The
ventro-lateral lobe i& very ~.cute andsome 15 degrees at the apex. On thebroken surface it is seen that the septal
suture is shouldered near the peripheryof the ventral wall.
Comparisou :-The subtri~ngular section of the whorl is commonly met within Hercoglossa, but rare in Aturia.
(Comp. figs. 116 and 125. STENZEL. 1940).
The dorsal position of the siphuncle andthe aspect of the septal suture however,prevent the reference of this species to
Hercoglossa (Mli.I.ER nnd FuRNISH, 1938).
Though such a broad whorl is uncommon in Attwia, A. t1·iaugula STENZEL
has the inner volution triangular andbroader ttan the whorl of this species.
Aturia paezir:zae 0l'I'E:->IIEIM from tl;ePalaeocene (?)of Egypt Civhu.F.R, 1947)
is another hav-ing a broad triangularwhorl. as high as broad. In that sp:cies.
however. the median height of the lastwhorl is quite reduced and the suture
not far removed from Aturioidea.
The whorl section of Aluria luculoe11Sis MILLER from the Miocene ofAngola is also very broad. but wellrounded and elliptical rather than triangular. I am particularly interested in
the specimen of the Angola species in
fig. 6, pl. 31, MILLER, 1951, to see thatthe median ridge appears to be present
between the sutures. The ridges are
however. not so distinct as those of thepresent species. The lateral saddle may
be more or less undulated in that species,
but not so clearly biarcuate as in thisspecies.
Combined with the triangular whorl
section, the high specialization of the

2·15

lateral saddle and the appearance of theinterseptal ridge reveal tllat this species
is so unusual in the Aturidae that it
may be segregated out of Auria s. str.,
if better material is availabe.
Occurrence:-Oyake formation of Upper Eocene Nogata group MATSUSIIITA,(1943), at Aso Yoshikuma coal mine,
Usui-town, Kaho country, Fukuoka
Prefecture.
Rt'fcrences cited
KoBAYASHI, T. (1954a), A new Crmatoceratid

from the Palaeogene of Northern Kyush·.tin Japan. }apatz. four. Geol. Geogr.. Vol.

24.
- - ( 1954b ). A new Palaeogene Paracenoce·
ratoid from Southern Kyushu in japan.
Ibid. Vol. 24.
MATSUSI!ITA, II. (1943), Geology of the Coal·
fields in Northern Kyushu. 1\'julhll· l\o·zangaku-Kaishi, Sp. No.
1\HLLER. A. K. (19,17). Tertiary Nautiloids of
the Americas. Geol. Soc. Am. ~!em. 23.
- - (1951), Tertiary Nautiloids of WestCoastal Africa. Atm. de Mus. dtt Co11go

Beige, Tervuren, Ser. in 8°, ser. Geol. Vol.
8.
- - and FURN IS II, \Y. 1\I. (1938 ). Aturia fromthe Tertiary of Mexico. four. Pal., Vol. 12.
NAG.-\o, T. (1926). A Iuria yokoyomai, nom.
nov. from the Palaeog~ne of Kyushu. Sci.

Rep. Toholm Imp. Univ. 2d. Ser .. Vol. 9.
No.2.
SHIMIZIJ, S. (1926), On two Species of Nauti·

loidea from the Tertiery of Japan. Ibid.

Vol. 9, No. 2.
STENZE 1., II. B.

( 1940 ), Tertiary N:mtiloids
from the Gulf Coastal Plain. Univ. Texas

Pub/. 2945.
YoKoYAl\IA, M. (1911). Some Tertiary Fossils

from the Miike Coal-field. Jour. Coif. Sci.
Imp. Univ. Tokyo, Vol. 27.

246

PROCEEDINGS OF THE PALAEONTOLOGICAL SOCIETY
OF JAPANa*i!i ~1/m¥~ m, 63 liT! !911 ~J 1956 ~ 6 J:J
20 a~t1ifm*~:E!Il~l'fti!&J!f~~lfm~¥&~'-c
Jh'\.A<:f*:JflH 1...--fc: ($~iff 28 45)o ~iti(-iJf:iift(j:I'C Mlii1it~ ~ I± ~ (l) .!Hi i) "1:' ~ 0r0!;liJ!!.~~J:. I)

Eucommia Q)j}fiffi (ft~) ......

································· .................. l!'i!liiJ-Jj}:Qfi}~lff Ginkgo Q)f;l!-'f·c~Hlflllllill (ft~) ..... .

................................ )~fold-·!)} • iWi~~JljJ
li!t7kiRlR~!Y~~lfii/fiQ) Acer (ft~)-1/lil-·91

alilil!i11ut-Q)I11Hmf!J:ri Ctt.fA:) .................. &!flil-1;~
f«1~mi¥Wdi8H!JEf11iiH: -:>1.,-c .......... -~P'¥ ~Analysis of Foraminiferal Assemblages from
Arari Bay, Izu Peninsula, Japan (ftlll'l) ...
......................................... Hiroshi UJIIE
Mesosclruberle/la, A New genus of Permian
fusulinids from Japan .......................... ..
... Mosaburo KANUMA and Sumio SAKAGAMI
Fusulinids from the limestone conglomerate
in the Nishinoiri and Sakaguguchiiri Val·ley, Kanyo, Hinode-mura, Nishitama-gun.
Tokyo-to, japan ............... Sumio SAKAGAMI
Upper Visean corals newly found in the
Northern Kitakami mountain region .........
........................ T. YosHIDA and M. KATo
New specie3 of Siphonodemiron from japan........................ M. MINATO and M. KATo
Amygda/oplry/lum giganteum (YABE et HA·
YASAKA) newly found from Okayama Pre·
fedure ...... M. M!NATO and K. NAKAZAWA
Revision of Halysitidae ( ftlm) ................ ..
.. .. .. .. .... .. .. .. ... .. .. .. ..... .. .. Takas hi HAMADA
Bryozoa from the Daishaka Formation (Plio·cene) Nakatsugaru-gun. Aomori Prefecture,
Japan (ft~) ..................... Jun KATAOKA
On the Triassic Rhynchonellids of japan(ft~) ........................... Akira ToKUYAMA
Waagenochoncha from the Permian of theKitakami mountains, N. E. japan .......
................ I. HAYASAKA and M. MINATO
Spit~omarguni[era from Japan ................... ..
... ........... M. l\1INATo and K. NAKAMURA

Tertiary Mollusca from the Ascgima-formation. Niigata Prefecture (ftift) .............. .
.................................... Tsutomu UTASHIRO
Miocene Mollusca from the Betuchiyo.formation. Nagano Prefecture ( ft~) ............. ..
.................................... Tsutomu lJTASHIRO
Some Species of Genus Thracia from Hokkaido (Studies on the Molluscan fossils from
Hokkaido-lll) ........................... S. UozUMI::lti[lj)ttjjfiQ.>}ifi1!'J "Propeamusitmz" C. " De/ectopecten" Q)~ti!~Jll!l;:-:>1. ·-c ... ,f,M;£ tlf·!Mn: 11
B$im Mya }jjtQ.>?}:ffi.&t.H:·Q)~~I,:-:>I.'"C (~Q)

1) ....................................... t¥.rr.

g'Ji¢.J')IYJ~]!€

Venericardia

11c Crassatellites 1:.-:>

1., -c <ttlfJfi)... ... .. . .. ... ..... .. ... .. .. ..-~rill! IX~

On " PatiJropeclen iitomie11sis " ( ft~) .......... ..
......................
Masahiko AKIYAMAOn Some Species of C.enus Glycymeris fromCentral Shinano, Japan (ft~) ................ ..
.......................................... Kunio TANAKAOn Some Species of Miocene Dosi11ia from
Northeast Honsyu, Japan( ft~) Shigeru AoKI
Fossil and Recent Species of the Genus
Panomya from Japan (f\:;~) S:iburo KANNo
Inoceramus mihoensis n. sp., c 1:. ~ Q)i'J:!Jl<··················································· ~$ii!.er.
A Study on the Liassic Bakevellias in Japa'l(f\';;&'l) ................................. ltaru HAYAMI
Further Notes on the Kossmaticeraticls from
Hokkaido .................. Tatsuro MATSUMOTO
Turonian Damesites from Hokkaido ........... .
............................... Tatsuro MATSUMOTO
Revision Chronologique de Ia Serie de Kara·
kuwa (Jurassique moyen) (ftlm) ........... .
........................................ Tadashi SATO
A Palaeometeorologicallnterpretation to the
Occurrence of the Argonautinae in Province Kaga. Central Japan ({tll)i;) .......... ..
.................................... Teiichi KOBAYASHI:ll!:£119.1.1fl:mtttiliiuxt.: 11.::. Q) ~t-t.mmcraJt (?) rt

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