la .ft"~±~~~~.:k·;e-t
Transactions and Proceedingsof thePalaeontological Society of Japan
New Series

No. :30

Palaeontological Society of Japanjune 20, 1958

CONTENTS
TRANSACTIONS
Page

Saba lites a us den Wakata Schichten von Tsushima. Nordkyushu ........... .
............... ......... ......... ...... ... ............... ............... ......... Kiyoshi TAKAnAsHr 185
336. On the Miocene Pectinidae from the Environs of Sendai; Part 10. On
Pecten (Aequipecteu) yanagawaensis No:-.wuA and ZrNno ... Koichiro J'VI.o\suDA 189
337. Supplementary Descriptions of the Liassic Pelecypods from the Kuruma
and Shizukawa Groups in japan .......................................... Itaru liAYAMr l!:J3
338. Species of the Genus Neptunea from the Palaeogene Formations in theKushiro Coal Field. Hokkaido, japan .............................. Masaru l'vL\Tsur 201
339. So~e Cambro-Ordovician Fossils from the ;Tan'gyang or Tanyo District.
South Korea ............................................................... Teiichi KoBAYASHI 211
340. "Monoplzyl!ites" arakurensis sp. nov. from the Maizuru Zone ................. .
............... ......... ..... ......................................................... Keiji NAKAZAWA 217
PROCEEDINGS ................................................................................................ 222
335.

President :Hisakatsu YABE

Councillors:

Kiyoshi AsANO, Riuji ENvo (Business and Accountant). Seido ENoo.

Haruyos}li FuJnroTo (Publication), Shoshiro llANzAwA, Kotora HATAr. Ichiro
HAYASAKA (General AITairs), Kazuo HuzroKA, Teiichi KonAYAsm (Editor),]iro MAKIYAMA, Tatsuro MATSUMoTo, Masao MrNATo. Tokio SHH<AMA. Fuyuji
TAKAr (General Affairs), Ryuzo ToRrYAMA
Secretary:

Tetsuro HANAr

Assistant Secretary:

Takeo lcHrKAWA

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. 30. pp. 185-188, pl. 27a, June 20, 1958

:1:15.

SABALITES AUS DEN WAKATA SCHICHTENVON TSUSHI.MA, NORDKYUSHU*KIYOSHI TAKAHASHI
Geologisches Jnstitut, Kyushu UniversiUit:X'·Jf.fi~lBIJYlilfr Sabalites: ,:.(f)~*(t. tJ.rY.i- [MJ$J1t9:t.f\:i.:.J: fJ, lill.:U:UfH: L·n·~Wfill'l r::51Il
1..1~ rtrtJ·(,~I;;l.i~tt. :ttlfb~~~eH:f~'ffil~c.-n·L rJrm'J l'~FH::U.i (f)Jmt\liit~flllft'lr$1.:~-t~ •flY:*-.:_(f)ffi'f;-f(;e,tlfi!!!'I'J,t-__.,m~t;·i~JvC\•7.. Sabalites nipponicus ~.; J:lf S. chineusis .1:l2<JJOL. S.
Wt/aislmensis f.t. M1ilm~ ~-M' L -c~T,--t ~" :11!!\ll.t~ft(U.; ..Z.. (, <il!iliWfllt C. )J.f,t. L- ·} ~ c · i!'li lit.l<~i nleitung

Ris heute wurde schon von cinigen
Forschern eine zicmlichc Anzahl vonSaba lites uipponicus ( KRYsHTOFov rcH) a usden palaogenen Format ionen in den
Kohlenfeldern von Hokkaido, Ube,
Nordkyushu u. a. veroffcntl icht. Zuerst
wurdcn Yon A. KRYSHToFovrcH (1918)
die palmartigen Pflanzenfossilicn aus
den Kohlen eingclagerten Schichten
von Bibai. 1-lokkaido unci Takashima.
Kyushu als Saba/ nipponira n. sp. beschrieben. Nach ihm haben S. ENoo,
T. NAGAO, H. YABE, H. MATSUSill'!'.-\, T.
YAMASAKI u. a. iiber Saba/ites niPfJOnicus(KRYSIITOFOVICH) aus den altterti~iren
Schichtcn von Ishikari. Ube und Nordkyushu berichtet. S. ENno (1934) hat nocheine andere fossile Art, Sabalites chinensis
ENno. aus dem Fu-shun Kohlcnbergwcrke der Siiclmandschurei (Fushun
Schichten-Gruppe; oberes Eoziin) beschrieben. Der Verfasser berichtet biervon einer neuen Art von Saba/ites aus
den Wakata Schichten von Tsushima.

Abh. 1.

x : Fundort (Wakata) von Sabalites
I: Izuhara. K:
lais/mensis TAK.
Komoda, Ke: Kechi. S: Shiohaina.

Das vorliegende Fossil wurde vor
Ianger Zeit von T. 0KABr: im sog.
.. Wakata-Stein" gefunden.
Seitdemwares lange in der Hoheren Schule Tsushima bewahrt, bis Dozent Y. OKAMoTo
es zur Forschung zu mir gebracht hat.

*Received June ll. 1957: read June 15,

1957.
l8p

Kiyoshi TAKAHASHI

186

Bei dieser VerOffcntlichung ist
der Verfasser Herren Prof. Dr. T.
lVL<~.TsuMoTo, Prof. Dr. R. Toi{JYAMA
unci Dozent Y. OK.'\MOTo an dem
geologischen lnsti t u t der Un i vcrsiUit Kyushu uncl Herrn Y. lh..-,:-;oan der Iliiheren Schule T:~ushima
fur ihrc freundlichcn Anregungcn
zu grossem Dank verpflichtct. Fr
muss auch hicr I-Ierrn Dr. S. ENDo.
der bei der Bestimmung cler Art
ireundliche Ratschliige gegcben
hat, von ganiem Herzen danken.
Dieses Spezimen befindct·sich im
Heim:~t:Museum (Kyodo-Kan) von
Izuhara, Tsushima.

l..L.:

1'?

f.?_:=.:l

0

~

E
0
.c

1

~

0

~
2

F=-=J
1=-=:J

LLI

3

(L

Cd
4

xx

VerOffentlichungen beziiglich der
Geologie und Stratigraphie vonTsushima sind \'erhiiltnism:issig
wenig. D. SATo (1908) hat zuerst
dariiber verdffentlicht. Fr setzte
ihr geologisches Zei tal ter in das
Mesozoikum.
I. TATEIWA 11934)
hat die Ablagerungen von Tsushima im ganzen als Taishu
Schichten-Gruppe bezeichnet. ihr
geologisches Zeitaltcr dem Dan
angeordnet, und die Tatigkcit dcr
Laramid-Bewegung in Ostasicn
betont. E. KoN'No* und T. MATst;MoTo* haben im Jahre 1913 den
Uber blick der Taishu SchichtenGruppe gemacht unci sind zu dem
Schluss gelangt. dass die Taishu
Schichten-Gruppe durch die gesammelten Fossilien clem Terti:ir
zu~uteilen ist. S. KANNo (1955) hat
geschlossen. class das Zeitalter der
Taishu Schichten-Gruppe durch die
Muschclschalereste, die im Innercn
einer Grube der Taishu Mine* fhr Erforschungsresultat der Taishu
Sc~ichten-Gruppe

ist unvertiffentlicht.

xx~~-:--:--Taishu Sl'h~ehten-Gruppe~?~QP_ _ ~._ • Sabal.if-_-_--:.._- X tos u.a.

...::;::;:..

~----==-~---4='··::::i·•. ~..

o(JI

LL.-.:··.; .

ent~----_-_~

t--=--..:..
o 95o- r- __

<(

(/)

1000 .. , ......... .

bi..L
Eo

/:"'..:.... . ..:.-:
1-----

::J

E

'"'
Gl

I~ g 500c'C

1- .... 0--- .

\:'_:__..=_-:}--. . :~::·.·.~··.'. ~x

0

:::>

E

o

~

r· .-: -. - -: .
u.: .600•.!..? '_,_; ·_;_: ~ ~--Abb. ~.

Bcgrifflichcs Profil dcr Taishu
Schichten -Gruppc.
1 : Schicfcrton und Schlammgestein. 2: Sandigcs
Gcstcin. 3: \Vechsellagerung von Sandsteins undSchieferton. 4: Sandstein und Kong lome rat. QP:
Quarlz-Porphyr (Sill),Mollusken- oder Echinusrest,
P!lanzcnrcst.
[Anm.]:
Gruppebc~culct Schichtcn-Gruppe und F. steht
fiir
Schichten.

x:x:Sabaliles aus den Waknta Schichtcn von Tsushima, Nordkyushu

gefundcn wurden, OJ igomiozan ist. Der
Verfasser untersucht seit dem jahre
1951 die Geologic von Tsushima. Er
hat die Schichtenfolge der Taishu
Schiten-Gruppe festgestcllt. Ihr begrifflicher Durchschnitt ist in der Abb. 2
gegeben.
lm Ontcr- und Oberteil der Taishu
Schichtcn-(;ruppc sind Sandsteinc undsandigc c;esteine verh~iltnismassig grosser als Schiefertonc. lhr mittlerer
Teil zeigt mehr Schlammsteinc odcr
Sehicfertone als sandige Gesteine.
Sandsteine stellen zuwcilen dlinne linsenartigc Konglomerate. die haupts:ichlich aus den Kiesel von schwarzem
Schieferton. Sandstein und Chert bestchen. unci dazwischcn zeigcn sie
bemerkenswerte Verschiedenheit in derl\1tichtigkcit. Das kommt oft vor, classein etwa 5 em zu 20cm dichter hrettartiger Sandstcin mit dem schwarzen
dili1nen Schieferton aufeinandcr altcriert und an dcr Ober- unci Untcrflilehe
solches Sandsteins Rippel- oder Rilll\1arke gcdruckt ist. Man kann auchzuweilen Lebensspuren im Sandsteinlinden. Naeh K. FuJJJ ist Sanclstein vonTsushima ei n Su bgrau wacke-Typus.
Man kann allgemcin viele Musehelschalerestc im schwarzen Schiefertonoder Schlammstein linden und auch
die Eehinusreste. die von A. MoRISHITA
a is Pericosmus cf. spatangoides LoJ~JoL*
bestimmt wurden, linden sich meistcns
in sandigem Schieferton oder Feinsanclstein.
Beschreibung nm Sabaliles

Sabafites taislmensis n. sp.
Tafel 27a. Figur I.

187

ist nicht so gut erhalten, aber stark
eingeschlagen. Der griisste Teil dcr
Blattlamina ist zersWrt; die Form
viclleicht fiicherformig. iibcr 50 em im
Diameter. Die Rachis et was stark. ca.
1.4 em breit. sich an der Rlattbasis
nicht vergriisscrnd. allmiihlich nachobcn schmalcr werdend. Der Bla'Hsticl
ist relativ stiimmig. ca. 3 em breit,
Blattstielrtinder ohne Dornen.
Die
st rahlenform igen Fieder rei chen bis
zur Rachis. etwa 50 an der Zahl,
linear-lanzettfiirmig, gemcsscncs l'vlaximum ihrer Breite 1.3 em. Der 1\iittelncrv regelmrissig stark. dcr Seitcnncrv
parallel dem 1\littelnerv. undeutlich.
lhre Textur rclativ dUnn. aber steif.
Vcrgleich :-Dcr vorliegen.clc Rest ist
cler japanischen paliiogcncn Art Sabalites nipponiciiS (J\RYSHTOFoV!CH) Ulld
dcr ehinesischcn obereoz:inen Sabalites
chinensis ENn" schr iihnl ic h, a her sie
haben einigc versehicdcne lVIerkmalc.
I>cr bestchende Rest hat rnehr zahln•iche Strahlen. starkere Rachis undst!immigeren Blattstiel als Sabalites
nipponicus (1\ J~YsJJToFov Jell) u ncl starker
cariniertc Strahlen, st:irkcre I~achis
unci weniger Maximum der Blattbrcitc als Sabalites rhinensis ENoo.
Zahlreichc Bcrichte von Sabalites aus
den oberkrcidcn und paliiogenen Formationen Nordamerikas sind bekannt.
Einc amerikanische Art Sabalites vicksburgensis BERRY hat geringere Zahl der
St rahlen und mehr brei ten Blattst rahl
als vorlicgcndc neue Art. Die vorlieg('nde Form ist nichl genug erhalten,
aber sic win! durch obcn erwiihntc
Merkmale als selbsUindigc Spezies bet rachtet.
( ;l'O{ogisches Zeit alter:- Vielleieht OJ i-

Beschrrilmng:-Das vorliegende Blattgoz~in.

* A. MoJUSIIIT.'\, gcol.-mineral. Inst. derFwulort :-Izuhara. Wakata, Provinz
Nagasaki (Tsushima-lnseln).
;lufbewalmmgsstel/e :- Ilei mat- Museum

Univ. Kyoto, hat die Echinusreste aus dcr
Taishu Schichten-Gruppc untersucht.

Ki yoshi T AKAIIASIII

188(Kyodo-Kan), lzuhara, Provinz Nagasaki(Ttmshi ma-l nseln).
Literatur
KRYSHToFovrcrr, A. (1918). Occurrence of·the Palm, Sabat nipponica n. sp .. in the·Tertiary l~ocks of Hokkaido and Kyushu.
,..Jour. Geol. Sm·. Tollyo, Fol. 25. So. 3, pp.
'5~-66.

BEyY. E. W. (1924). The middle and upper--Eocene Floras of southeastern North
America. U.S. Geol. Surv. Prof. Paper. 92.
ENDO, S. (193-1). The geological age of the
Fu-shun Group, south l\[anchuria. Proc.
Imp. Acac/., X, No. 8. pp. 486-489.
- - (1953), Notes on the Cainozoic Plantsof East Asia (1. 2). Kumamoto ]our. Sci.,
Ser. B. No. 2.
- - (1955), leones of Fossil Plants from

----

--

Japanese' Islands. (jap.)
KANNO, S. (1955). Tertiary Mollusca fromTaishu i\Iine. Tsushima Nagasaki Prefecture. Japan. Trans. Proc. l'alaeonl.
Soc., Japan, N. S .. No. 18, pp. 31-36.
REm, E. M. & CHANDLER, M. E. J. (1926), The
bembridge Flora. Brilislt Must•um(Natural
llistory).
SATO, D. (1913-14). Erdgestalt und Geologic
von Tsushima. (jap.) ]our. Gt•o~:r., Vols.
25. 26.
TATEIWA, I. (1931). Cretaceous Flora ofTsushima, Japan. japan. jour. Geol.
Geogr., Vol. XI, pp. 185-209.
YAMASAKI. T. (1952). Discovery of Sabaliles
nipponicus (KRYSH.) from the Karatsu
Coal-field. Kyushu, japan. Mem. Fac.
Engi11 .. Kyuslm Unil'., Vol . .\'111. No. 1.
pp. 65-70.

-----------

Erk Iii rung der Tafel 27a
Fig. I. Saba/i(PS faislmensis TAKAHASHI. n. sp. . ......................................................... p. 187
X ca. 1/2. Fundort: lzuhara. \Vakata, Provinz Nagasaki.

TAKAHASHI: Sabalites von Tsus hima

MAsUDA :Miocen e PectinidaelalbPlate 27a

P late 27b
2a

2b

3a

3b

5a

6a

5b

6b

4

Trans. Proc. Palaeont. Soc. Japan, N. S., No. 30, pp. 189-192, pl. 27b, June 20, 1958

:38!i.

ON THE .MIOCENE PECTINIDAE FROM THE ENV 1RONS OFSENDAI; PART 10, ON PECTEN (AEQUJPECTEN)YANAGAWAENSJS NOMURA AND ZINBO•
KOICHIRO MASUDA
Department of Geology, Faculty of Education.
Tohoku university{Jilhlnnrlllfrkdf.ilff Pectinidac:
ZINno ]:.--:>~ .~c:.:r-17) 10. Pecle11 (Aequipecten) yanagawaensis NOMURA andvtllti«J J: IJtJ:~ l..f~~iXI7)~*· ~:t;~...f,:~~{(ft.lftVC:jJJ;li!~~fj., f.:. •.If! lll 'if:- .Q&

Pcclt' n (/lequijJec Ien) ya nagm{'(zensis was
first described by S. NoMURA and N.
ZINBo irom the Yanagawa formation at
Yanagawa-machi, Date-gun, Fukushima
Prefecture in 193G, and subsequently
it was reported from the l\Ioniwa for·mation at Moniwa. Sendai City, by S.
NoMuRA in Hl40. As the type speci ·men was imperfect and some importantfeatures were not described at the timeof i ls proposal. thus writer wishes toredescribe the characteristics of thisspecies based upon the specimens whichwere collected from the Moni\va formation by the writer. and to clarify
its relationship \Vi th certain otherspecies mentioned in this article.
Numerous specimens of this species
and a related species which arepreserved in the collections of the
Department of Geology. Faculty of
Education. of the Institute of Geology
and Paleontology, 'Faculty of Science.
both of Tohoku University, and thetype specimen and the others of the
Saito Ho-on Kai l'vluseum, all in Sendai
City, ·were studied. and the results of
examination are presented herein.
Acknowledgements arc clue to Dr.
Kotora HATAI of the Department of
Geology, Faculty of Education, Tohoku
University, for his kind supervision.
Family Pectinidae
Subfamily Pectininac
Genus Cl)'j>lopectew·n,,~.~.. BARTscH
and REHDER, 1938

Cryptopecten ymwgawaensis(NoMURA and ZINBO)
Plate 27b. Figures 1-8.
1936.

Pecten(Aequipecten ?) yanagawaensis

Nol\IURA and ZINBO, Saito /lo-on Kai

1940.

* Rcc~iv~d Aug. 8, 1957: read at the 66th
meeting of the Society at Akita, June 19,
1957.
189

JJus .. Res. Bull., No. 10, p. 337, pl. 20,
figs. 2a-h.
Pee/en (Aequipec/en) yanagawaeusis No·
l\HmA and ZINBO, NoMIIIlA, Sci. Rrp.,
Tolwku Imp. U11it•., Sr•r. 2, Vol. 21, No.
1. pp. 19-20, pl. 1, figs. 10-13.

190

Original description is as foil ow:;:"Shell small. suborbicular in outline. inflated. nearly as 'long as high.
equilateral; !?ide of disc more or lessConcave, apical angle about ll0°, Yentral margin regularly curved. Surface
ornamented with subequal. rounded radial ribs which are accompanied witha thread on both sides and close to
their base; interspaces rat her deep,
broader than ribs themselves, sculptured by fine transverse I ines. Ears
imperfect, preserved one ornamented
with unequal ra~ial riblets crossedby fine growth-lines. Height 20 mm ..
length_ 21.5 mm .. depth 5 mm."
The specimens collected by the writer from the Moniwa formation at l\loniwa take the following d_escription.
Shell small in size. moderately thick.
suborbicular in otitline, ·subequivalve.
the right valve being a I ittle moreconvex than the left. in-equilateral. thelength of posterior sic!c· being longer
than that of anterior: sid-e, and posterior submargins longer than anterior

and regularly concave; valves radiately ribbed. and forming an angle ofabout 90° at apex.
Right valve with about 21 elevated.
more or less squarish. rounded radialribs accompanied With a tine thread
on both sides of radial ribs; interspaces nearly equal to or a little
broader than the ribs themselves. andsculptured with numerous. transverse,
fine lamellae; anterior auricle larger
than posterior, sculptured with a few
distinct radial threads and concentriclines. and furnished with deep byssal
area; posterior auricle triangular inform, truncated behind at about rightangle, and similar to anterior in sculpture, though radial threads less distinct than anterior; hinge with narrowand shallow resilial pit. ctenolium. andconspicuous cardinal crura ornamented
by fine transverse incision. Left valve
with sculpture similar to the right.
Internal surface of valves rathersmooth except for characteristic marginal serration.

Dimension (in mm.) :Valve

Right

Right

Right

Right

25

22.5

19.3

'!.7

23

19.5

12.5

11

9

Height

'

Left

Left

14.5

29

23

1:. 7_ :

82

6. 7

15

-----;ul----;- ~- IS~
11~ I~ ------s.5

817~ - -l2. 7~-~1.-~ _1_0_

10.5

15

- - - -

Ll.•ngth

I

~--

LPS+

II

1-Iingc-length

II--

H5

12

10. 5 I

12. 5

12.5

5

6

I
~1

95"

go·

go·

10.6

- - - -

Depth
Apical angle

11__

3._6_- 8

go•110•+ ..... .

105·

I

100'

I

95'

Left

19.5

1

10.5

10

-~,~~~6-_-1 ____6~= ~-5_.5_95•IGrowth angle

11

Left

95'

1

go·

90"

-------------

I 110" i 105"

I

100'

~-~

LAS=abbrcviation for length of anterior side.
LPS=abhreviation for lcngt h of posterior side.

Type locality, Formation and i\R'e :-R ivcr cliff of the-Hirosc-gawa, at the south-

east end of Yanagawa Park, Yanagawa-machi, Date-gun, Fukushima Pre-On the i\Iioccuc Pcctinidac from the Environs of Sendai

fecturc. Yanagawa formation. Earlyl\'lioccne.
Remarl<s :-This species is character·ized by its small inequilalcral shell.
about 21 elevated, more or less squarish,
rounded radial ribs which are accom·
panied with a fine thread on bothsides. interspaces which arc ornament·
eel by transverse fine lamellae, tri·
angular posterior auricle of the rightvalve which is truncated behind at
about right angle. conspicuous cardinal
crura ornamented by tine transverse
incision. and characteristic inner marginal serration. Usually the radial ribs
are round-topped, but in very wellpreserved specimens the radial ribs
are sometimes ornamented by veryfine transverse lamellae. The numberof radial ribs varies from 16 to 26.
but among them the most frcquem
number is 21.
This species resembles Cryptopecten
vesicu/osus (DuNKER) which occurs as
Recent in the Southwestern Pacificand as fossil in the Pliocene andPleistocene of Japan, but it differs
therefrom in having a less number oflamellatecl radial ribs which arc separated into two parts by a furrow near
the ventral margin in adult specimens,by the intcrspaccs sculptured with a
few imbricated radial threads at about
Lhe lower half of disc. and by theradial ribs being much narrower than
the interspaces in the left valve.
The geological formations fromwhich ymwgmuaensis is known to occur arc the Yanagawa formation in
Fukushima Prefecture. and the Moniwa
and Otsutsumi formations in Miyagi
Prefecture. The rocks from where
yanagariJm'nsis has been collected or reported from consist of coarse-grainedsandstone or granule conglomerate.
The conditions of the sea bottom on

191

which yauagawaensis once lived may
be interpreted from the nature of therock which preserved it. The thermal
conditions of the sea at the time ofbuilding of the Yanagawa, Moniwa
a_rHl 6tsutsumi formations are judged
from the associated fauna of the present species. At Moniwa. this species
occurs as isolated valves in granuleconglomerate or coarse-grained sandstone in which abundant pectens, otherpelecypods. some gastropods. echinoids,balanicls. brachiopods, bryozoan-fragments and corals occur in association.
The majority of them arc arranged
parallel with the bedding plane andwith their convex side upwards, andthe majority of the observed spEcimens are more or less water-worn.
From the mode of occurrenc·e and thestate of preservation. it is inferredthat the shells of this species ma~
have been transported from the siteof living to that of burial. However,
it is thought that the distance oftransportation was not great and fi]so.
that the present species probably preferred a shallow water bottom freefrom muddy materials. and inftuence·dby warm thermal conditions. The geo1og ica I range of yanaga/l'aensis is restricted to the Early Miocene in a
twofold division.
As noticed in early lines, the present species is closely related to Cryptopecten vesiculosus (DuNKER), and it
may be the ancestral form of vesiculosus, but further materials are ncccessary to settle this problem.
Referencesl\.1. (1940). On Some Pectinidae
Fossils from the Miocene Deposits of
the Tomiya Block, Miyagi-ken. Northcast I Ionshu. japan. japan. four. Ceo!.
Geogr., Vol. 17. Nos. 1-2, pp. 1-15, 2 pis.

NAKAMUUA,

K6ichiro MAsUDA

192

S. and N. ZINBO (1936), Addition·a) Fossi I Mollusca from the Yanaga wa
Shell-Bed~in the Hukusima Basin.
Northeast llonshu, japan. Saito l!o-on
Kai Mus., Res. Bull., No. 10, pp. 335-3•15,

NoMURA.

1 pl.

- - (19-10), Molluscan Fauna of the l\Ioniwa
Shell Bed exposed along the Natori·gawain the Vicinity of Sendai, ~liyagi Pre·
fecture, japan. Sci. Rep., Tolwku Imp.
Unit•., Ser. 2, Vol. 21, No. 1, pp. 1-·16,
3 pis.
YoKOYAMA, M. (1920), Fossils from the
1\Iiura Peninsula and its Immediate
North. ]our. Col/. Sd., Tokyo Imp. Unit•.,Vol. 39, Art. 5, pp. 1-193, 20 pis.

Explanation of Plate 27b
Figs. 1-8. Cryptopecten )'OII(tgawaensis (NoMURA and ZINBO) .......................................... p. 189
la, b. a, Right valve. X 1. b. Internal view of fig. Ia, X!. DGS. Reg. no. 3545. Loc. i\loniwa,
Sendai City, Miragi Prefecture.
2a, u. a. Right valve, X 1. b. Internal view of fig. 2a, X l. DGS, Reg. no. :'l:i•l!i. Loc. Same
as alltlve.
3a, b. a, Right valve, XL b, Internal vie\v of fig. 3a, X l. DGS, Reg. no. 21~0. Loc. Sameas above.
·1. Right valve, xI. DGS, Reg. no. 35-16. Loc. About ·100 mrn. west of Jyunishindil, Kumanodi), Natori-machi, Natori-gun, Miyagi Prefecture.
5a, b. a, Ldt vJlvc, X I. b, Internal view of fig. 5a, xL DGS, Reg. no. 354_5. Loc. l\toniwa,
Sendai City,-Miyagi Prefecture.
6a, b. a, Left vt~fv·e, x 1. b, Internal view of fig. 6a, x l. DGS, Reg. no. 3545. Loc. Sameas above.
7. Left valve, X I. 'DGS. Reg. no. 2140. Loc. Same as above.
8. Left valvt', x,t.5. DGS, Reg. no. 3546. Loc. About 400 m. west of Jyunishindil, Kuma·
nud6. Nat!}ri-machi, Natori-gun, Miyagi Prefecture.
Photo. by K. MAsUDA

Trans. Proc. Palaeont. Soc. Japan, N. S., No. 30, pp. 193-200. pl. 28, June 20, 1958:~:17.

SUPPLE.MENTARY DESCRIPTIONS OF THE LIASSICPELECYPODS FROI\f THE KURUMA AND
SHIZUKAWA GROUPS IN JAPAN*(Studies on the Liassic Pelecypods in Japan. !J)ITARU HAYAMI
Geological Institute. University of Tokyo*·IT7 f 7 7..0)-.·.j.Xf{o:>;Jc.f!XIiflJ.E: ~l'I!JII• *JIJiil~lffl!l'tKI.:tt,.:~;;*:lll·l~o:>..:::&WJ:!ll'''lr<~t~HTt'¢1./:, t~%'11\0)IjliJ·G Prolocardia. Pfeuromya, liomomya, Thracia 0)4#ftifi~o'H.rl0fili~;l!IUJ1lv
t.:o:>-r,!Llokt-t;:," *zkJtfi!W:Yt ·o:>LH ·-=>~1. t oo:lltJ:m-r. Mf'H :tc~-rt..:t ,t.:lV -r. c. tt Go:>J; 'J~Rt.-i!Ll•lill.!:htlitliHtllfjbtt.:S«~ bO)"t'ii;.:So
ill JJ<.w
m

In this art iclc arc described the following Kuruma and Shizukawa speCies:-

Fa 111 i Iy Paralic lodon tidac

Genus Paralldodon
fvlEEK and WoRTIIEN. 1866

Paraltdodon sp. indct.
Grammatodm1 (?) sp. indet.
i'rolocardia kurumensis, HA v Al\H.
new species
Pleuromya hashidatensis HAYAMI,
new species
Homomya saloi IIAYAMI, new species
Homomya sp. indet.
Thracia suhrhombica HAYAMI, new species
Thracia (?) sp. indet.
Cuspidaria ( ?) a sp. i ndet.
Cuspidaria (') b sp. i ndet.

Pamllelodon sp. i ndet.
Plate 28. Figure l.

Only a right internal mould is athand. Shell medium in size, elongated.
bicarinated. much longer than high(MM2800, 38.5 mm. long; 16.0 mm. high; 6.5mm. thick); umbo prominent, locatedat about a third of shell-length fromfront; postero-dorsal wing undeveloped:
ventral margin slightly concave in its
median part; hinge of Para/le/odon-type,very asymmetrical. composed of threeelongated horizontal posterior, three
curved anterior and several medianteeth; no plate for adherence of posterior adductor.
In the dentition and outline, thisseems more related to Cosmelodon BRANsoN(l942)( =Beus/l(msenia in ARKELL, 1930)

l\lost of them occur not commonly. andare represented poorly preserved specimens insuflicicnt for specific identincatiun. More than five pelecypod forms
besides these are distinguishable among
the Kuruma-Shizukawa collection· before hand, hut the writer hesitates to
describe them, because their generic
positions arc indeterminable at present.
"' Received Oct. 2, 1957; read April 28, 1958.
193

ltaru l-JAYAMI

form is more closely related to Grammatodon than to Pamllelodon or Cuwllaea. The radial ribs are more widespaced in the central part than onlateral sides. But the shell-size is sosmall for the genus that the writer
linds no comparable species in foreign
literatures.
Uccurrence :-Black sandstone at Shinatani.

than to Parallelodon (s. s.). But the subgeneric reference is not further endorsed, because of the ignorance of the inclination of median tcl'lh and surface ornaments.
Parallelodon niranohamcnsis
l-IAYAMI (1958b) from the Hettangian Niranohama formation is obviously different from this in the wider hinge-plate,developed postero-dorsal wing and absence of anterior carination. This isprobably an allytoCuwllaea lzettangil'llsis
TERQtli·:M (1855) from I he lower Lias of
Paris basin, which was included in
Beuslwusenia by AR'""-L (1930). But its
specific identification is deferred unt i I
the external characters are known.
Occurrence :-Black sandstone of Domerio-Toarcian Shinatani formation at
Shinatani in Omi-machi, Niigata Pref.

Family Cardiidae
Genus Protocanlia lknucn, 1S.15

Prolocardia· kurumensis IL"-YAMI,
new species
Plate 28, Figures 5-S.
1957, ]'rolocardia cf. COIII/Isa

HEALEY, listed
in KoBAYASHI and others, four. Geol.
Soc. Japan. Vol. 63, No. 7 38, p. 186.

Genus Grammatodon MEEK, 1860
Gmmmatodon (?) sp. i ndet.

Desr.-ription :-Shell small to medium·,subtriangular, fairly inequilateral,strongly inflated, much longer thanhigh; umbo protruded above hingemargin, recurved, slightly prosogyrous,
submesial; anterior margin rounded,passing gradually into venter; postero·dorsal one obliquely truncated. curving
more or less abruptly towards venter;surface divided into three parts by anterior and posterior blunt carinae; posterior part occupying about a third ofwhole surface, marked with about 25 fineradial ri blets; remaining parts with fineregular concentric striae; hinge known
only in posterior part of right valve;cardinal :~b small, conical. bordered bya triangular socket (2' and 4b') on each

Plate 28. Figures 2-3.

A left valve and two left internalmoulds arc at hand. Shell very small,trapezoidal, sharply carinated posteriorly, not alate, much longer than high(left valve, Mi\1 ~801, 10.5 mm. long;
7.5 mm. high; 3.0 mm. thick); umbo
protruded above hinge-line, situated atabout two-fifths oi' shell-length fromfront; surface netted with roughly
spaced radial ribs and concentric growth·lamellae; hinge of Grammatodon-type,fairly asymmetrical, composed of moreor less elongated horizont<il lateral andseveral granular median teeth.
The hinge structure shows that this.'v/easureme11l i11 mm.

Holotype (MM 2803) Left valve
Paratypc (MM 2804) J{ight internal mould

I

LengthHeight

21.5
20.0

1i.5
17.0

I

~_2~ickness

. i.

6.0
5. 0

Supplementary Descriptions of th<.: Liassic Pelecypods

side; right posterior lateral tooth short,subparallel to valve margin; adductors\veakly impressed. subequal; inner vent·ral margin finely crenulated in posterior
part where radials are distributed.
Obsemation and Comparison :-There arc
eight specimens, but all more or lessdeformed secondarily. The holotypc(Fig. 5) exhibits surface-ornaments ofProtocardia·type.
The \Veak ventral
sinuation is probably due to secondary
deformation. because it is absent in theparatype (Fig. 6) and other specimens.
Several smaller specimens (Figs. 7 and
8) from a black shale are strongly deformed. and at a glance they are verv
different forms from the two type specimens from a sandstone.
As listed before. this may be an allyto Protocardia co/llusa HEALEY (1908)
from the Rhaetic (or Noric) Napeng bed
in Upper Burma. But the posterior radial ribs are about nineteen in the Napeng species. whereas they are morethan 25 in number in the present spe·
cies. The umbo seems to be slightly
protruded than in con/usa. There aremany Jurassic species hitherto referredto this genus. But this is distinguishable from most of them in the more
trigonal outline and characteristic concentric ornamentation.
Occurrence :-B I ack sandstone andshale at Shinatani. Several specimen,;procured also from a sandstone at theupper stream of Kanayamadani. andone from a black shale at the middle
stream of Tsuchizawa.
Family Pleuromyidae
Genus Pleuromya AGAssiz, 18,13
P/euromya hashidatensis
HAYAMI.

new species

Plate 28, Figure.: 9.

195

1957. Pleuromya aff. forsbergi nippanica KanAYASHI and IcmKAWA listed in KonAvAsm and others. lac. cit.

Description :-Shell small, elongated.
thin, moderately inflated. about twice
as long as high (l\lM 2808, 30.5 + mm.
long; 16.S mm. high; 3.5 mm. thick);
antcro-dorsal margin short and obliquely truncated; postero-dorsa I one long,
fairly sinuated: umbo broad, blunt,
located at about a third of shell-lengthfrom front: posterior area wide andfairly l1attened; surface marked withsomewhat irregular concentric growth·lamellae: internal structure unknown.
Obsen•ation and Comparison:- Two left
valves arc at hand. The holotype ex·hibits the outline and surface-markingof this species. although its posterior
part is broken off. Unless the hinge isobservable, it is not easy to distinguish
Homomya from Pteuromya.
Generally
speaking. however, Homomya has a morerounded antero-dorsal margin, more in·ftated shell and larger clin;ensions than
Pleuromya.
In these features thisagrees better with the latter than thethe former.
_Pleuromya forsbergi (BoiiM) nipponica)\oBAYASIII and IcHIKAWA (1951)
fromthe Carnic Kochigatani group in Sakawa basin is very similar to this in
the external aspects. Although NAKA·
zAw A (1956) doubted its reference toPl~uromya, this is probably congenericw1th the Carnic species. But specifi·
cally this is different from that withregard to the more salient umbo and·less elongated outline. ~his is more orless similar to the holotype of Homomya
matsuoensis NAKAZAWA (1956. pl. 2, figs.
1a-e). Compared with its paratype(figs. 2a-d). however, the posterior area
is much more expanded than in matsuoensis. The shell-size of matsuoensis is
more than 50 mm. in length. Namely,ltaru HAYA!'.ll

196

it is much larger than this species.
Occurrence :-Black arenaceous shaleof Domerian Teradani formation (Ama/1/zeus-bed) at Kanayamaclani in Omimachi. Niigata l'ref. Collected by ToKu-

land, but differs in the more posteriorly
located umbo.
Occurrence :-Sandstone at Sh ina tani.
Jfomomya sp. inclet.

YAMA*.

Plate ~8. Figure II.

Family Pholadomyidae
Genus 1/omomya AGAssiz. 18•13
llomomya satoi IIAYAMI,
new species.
I' late :!8, Figures 10 a-c.

!Jesrri/Jfiou :-Shell medium. oblong.
subequivalve or equivalve, inequilateral. inflated, thin. about 1.5 times aslong as high (lwlotype. 1\11\1 2810. 5.t.O
mm. long: :35.!imm. high: 26.5mm. thick.
bivalved): antero-dorsal margin shortand rounded: postero-dorsal long andnearly straight: valve margin closed inanterior but gaping widely in posterior
half: umbo located at about a fourthfrom front; surface marked with irregular concentric plications and growthlamellae: hinge unknown but probably
edentulous.
ObserMtiou and Comparisou :-A solitary bivalved internal mould is at hand.
judging from the rounded anterior
margin and strong convexity of theshell, this is referable to Homomya, instead of Pleuromya.
This resembles
1/omomya signicollina .MARw ICK (1953)
from the Middle jurassic of New Zea-

. * The writer is grateful to J'vlr. A. ToKuYAMAfor the donation of the specimens.
Aleasuremeni i11 mm.

Ilolotypc (MM 2SJ2) Right valve
Paratype (1'\'ll\1 2813) Right valve
Paratype (MM 2814) Left valve

A solitary bivalved internal mould
belongs to an old collection of this institute. It is procured from the Kuruma group. but its exact locality andhorizon are unknown. This differs fromthe preceding in the more elongatedoutline, sinuated postero-dorsal marginand narrow posterior gaping. Its specific identification is deferred until better material is procured. Specimen.
i\ll\1 2811, 50.5 mm. long: 25.5 mm. high;24.0 mm. thick.

Family Thraciidac
Genus Tltmcia lh.AINVII.LE, 1821
Tlzracia subrlwmbica l-IAYAMI,
new species.
Plate 28, Figures 12-14.

Description :-Shell medium. compressed. thin. subrhomboidal in outline, much
longer than high; antero-dorsal margin
very slightly convex, while posterodorsal one is nearly straight or slightly
concave: posterior margin subverticallytruncated: ventral margin more or lessabruptly turned near its mid-point:
posterior area flattened, defined by ablunt carination; surface marked withirregular concentric plications and numerous growth-lamellae.
LengthHeightThickness

33.f;

24.()
22.5

3. 0
3. 0
3. 5

33.0
38 5

26.5

Supplementary Descriptions of the Liassic Pele..:ypods

ObserNII ion and Comparison :-Seven
single-valved specimens arc at hand.
Judging from the opisthogyrous umbo.
thin test and general outline. this isreferable to Tlzracia. although posterior
gaping, hinge-structure and muscle system arc unknown. It has been discussed by some palaeontologists whether
Tlzracia lkAINVILLF. (18~-t) appeared already in the Jurassic. The writer considers here Corimya AcAsslz (1843) andIlomoeodesma F1scnr-:R (1887) as two synomyms of Tl11·aria in agreement with
ARKEl.l. (1929-37).
This is distinguishable from the hitherto described species of Thracia inthe more rhomboidal outline. This isfairly similar to Thracia clepres~a SowER·
nv (1823, Vol. fi; A111<ELJ .. 1929-37) fromthe Oxfordian and especially to its
lectotype in A11KELJ. (pl. 50. fig. 7) in therhomboidal outline. But the posterodorsal margin of depressa is more sigmoidal. This is also somewhat similar
to Thracia frearsirma n~ORBIGNY (1845)
from the Oxfordian of European Russia.
but differs from that species in theless inflated shell with a more flattened
posterior area. Corimya g/ahra AGASsiz(18·13) from the Upper Lias differs fromthis in the more inequilateral outline
and more posterior beak.
Occurrence :-Common in a black shaleof the lower Hettangian Niranohama
formation at Niranohama in Utatsumura. Miyagi Pref.

Tliracia (?) sp. indet.
Plate 28, Figure 15.

There is an internal mould of left
valve (MM 2815, 20.0 mm. long: 1-1.5 mm.
high: 2.0 mm. thick) on which concentric surface-markings arc impressed.
This is fairly similar to Tln·acia prisca
HEALEY (1908) from Napeng bed withregard to the similar outline and surface-markings.
But the material iscompressed secondarily, and its specificidentification impossible at present.
Occurrew:e:-Black shale at Shinatani.

Family Cn!lpiclariidlw
Genus CusjJidaria NARnn, 18-HI
Cuspidaria (?) a sp. indct.
Plal.c 28. Figurc.·s IG-19.

Shell small. slightly incquivalve.
spoon-like in outline. protruded posteriorly. moderately inflated. thin. becoming narrower towards postarior end:
posterior margin truncated: umbo located slightly anterior to mid-length.
slightly opisthogyrous; ventral marginsinuated near the junction with posterior area. which is flattened and sharply defined from main part by a narrowridge: surface smooth except for somewhat irregular growth·lamcllac.
~~~~-,l/easurement in mm.
(MM 2817) Left valve(Ml\1 2818) Right internal mould(iv!M 2819) Left internal mould

Obsen•alion and Comparison :-Fiveright and three left specimens are at
hand.
Although most of them are

197.

LengthHeight

19.5
17.0
20.0

13.5
11. 5
II. 5

------ -- Thickness
~---

3.5
2.5
3.0

strongly deformed secondarily. it isobservable that the posterior area of aleft valve is more contorted than a rightltaru198

and that the postero-dorsal margin ismore convex than in right.
This is a ven' strange form, and its
taxonomic position cannot be decided atpresent. The outline and inequivalve
shell remind one of corbulid. Corlmla
easlonii VoGEL (1900) from the Jurassicof Borneo and some other Jurassic corbulids. in fact. show more or less similar
outline and posterior carination. But
this cannot be referred to the genus by
the thin test. This is probably more
related to the Cuspidariidae, althoughsuch a sharp posterior carination andshort posterior area are unknown inthem. "Cuspidaria ·• ayabensis NAKAZAWA(1956) from 1he Carnic Nabae group hassuch a posterior area and may be congeneric with this. But the shell is lesselongated and the size much smaller
than in that species.
Cuspidaria (?) b sp. indet.
Plate 28. Figures 20-21.

There are nine specimens which resemble the preceding form in the external aspects and probably congenericwith it. But the shell is much smaller(left valve. MM 2820. H.O mm. long: 5.0
mm. high); posterior area more protruded backwards and defined more
sharply. The left valve is marked withfine concentric lines, and the right valve
with more wide-spaced gro\vth-lamellae.
But the discordance may be partly attributed to secondary deformation. This
form is probably an ally to Neaera sam·basana Voc.EL (1900) from the Jurassicof Borneo.
Ocntrrence :-Black shale at Nirano·hama.
Postscript
1.

After the writer's paper on GenJil/ia

HAYAMIand Isognomou in Japan (1957, japan.
]our. Ceo!. Geogr., I·'ol. 28, Nos. 1-3.) wascompleted, many well preserved specimens of I sognomon rikuzeuicus (YoKo·YAl\IA) were obtained from the uppermost part of the "Cyrenoid bed" atNiranohama. Judging from the material. the outline is fairly variable andthe byssal gape is fairly wide and theanterior margin sometimes strongly concave below the terminal beak as seenin Isognomon (s. s.). Its juvunalia havevery terminal and protruded umbones
and fairly different in outline from
Isognomon cf. rikuzenicus from the Kuruma group at Neiridani. Two internal moulds of I he latter form illustrated in that paper are probably adults
and specilicaHy distinguishable fromrilmzenicus.
2. Volsella /!allel!el!oides HAYAMI (1H58a,
Trans. Prnc. Pal. Soc. Japan, N. S., No. 29)
has been represented by three comparatively small specimens. But recently a large left valve (MM 2822, 70.0mm.
long: 675 mm. high : 11.0 mm. thick)
was supplied from the same locality.
It is obviously conspecific with the bolotype of baluwe/loides. judging from its
growthlines, though its anterior wingis comparatively small. It is illustrated
in Pl. 28, Fig. 4 in this paper. The
generic name Volsella, the oldest namefor the genus. was rejected by an opinion of the International Commissionof Zoological Nomenclature and has
been replaced by a younger nameJ\1odio/us. Therefore, the generic nameVolsella ScoPor.J, 1777 in that paper
should be read Jltlodiolus LAMARcK, 1799.

ReferencesL. (1843), Etudes critiques sur les
Mollusques f-ossiles. Monographic des
Myes.

AGASSIZ,

Supplementary llcscri ptions of I he Liassic Pelecypods
AIH<ELL, W. J. (19:)9-37), A Monograph ofBritish Corallian Lamellibranchia. Palaelmlogr. Soc. London
FISCHER, P. (1887), Manuel de Conchyliologie. Paris.
IIAYAMI, I. (1957). Cert,illia and /somwmou
in Japan. ]ajH/11. four. Ceo/. Gt:o)(r.. Vol.
28, Nos. 1-.'J.
- - (1958a), Liassic Volsella, Mytilus andsome other Dysodont Species in Japan.
Traus. PrOt:. J'a!. Soc. Japan, N. S., No. 2!.1.
- - (1958b), Some Hettangian h·lccypods
from the " TriJrtmia-sandstone " of the
Shizukawa Group in Northeast Japan.
japan. ]our. Geo!. Ceogr. (in press).
HEALEY, M. (1908), The Fauna from theRhactic Napcng Beds of Upper Burma.
Palaeonl. Intfi,·a, N. S., Fol. 2, /'1. 4.
J\onAYASIII, T. and ICHIKAWA, K. (1!150), Allo·
doutoplwra and some other Carnic Pelecypods from the Sakawa Basin in Shikoku.
japan. jour. Nu·. Sci. Unir. Tokyo, Sec. 2,
Vol. 7, Pts ..3-5.
- - , KoNism. K .. SATo, T., 1-IAYAMI. I. and199

ToKUYAMA. A. (1957). On the Lower
Jurassic Kuruma Group. (in Japanese)jour. Ceo!. Sor. japan, Vol. 63. No. 7 38.
1\IARWICK, ]. (1953), Divisions and Faunasof the Hokonui System (Triassic andJurassic). New Zealand Geol. Sun•., Pal.
Rutl., Vol. 21.
NAKAZAWA, K. (1956), A Study on the Pelecypod-Fauna of the Upper Triassic Nabae
Group in the Northern Part of Kyoto
Prefecture, Japan. Part -1. J1Jem. Coli. Sci.
Uni1•. Kyoto, Ser. R, Vol. 23, No. 2.
n'OimtGNY, A. (18-15), Systcmc jurassiquc (E·tagt: Oxfordien). Mollusques. In MuRCHISON. VERNEUII. and KEYSERLING'S"Gf,ologie de Ia Russie d'Europc et desMontagnas dt' I'Oural. Vol. 2. Palcontologie." .Loudon llllll. Paris.
SowERBY, .I. (1823), Mineral Conchology ofGreat Britain, Vol. 5.
VoG~:L, F. (1900).
Neue Mollusken aus dem] ura von Borneo. Samml. Gt•o/. ReichsMus. Leiden, Ser. 1, Rd. 6, lief/ 2.

Itaru200-

IIAYAMI---- -----------------

Explanation of Plate 28
Para/le/odon sp. indet. ................................................................................................... p. 193
Fig. 1. Right internal mould (MM 2800) x 1. Loc. Shinatani in Omi-machi, Niigata Ptef.
Grammatodou (?) sp. indet .............................................................................................. p. 194
Fig. 2.
Fig. 3.

Left internal mould (MM 2802) X 3. Loc. ditto.
Left valve (MM 2801) x 3. Loc. ditto.

Modiolus bakellelloides (1-fAYAMI)................................................................................. p. 199
Left valve (MNI 2822) x I. Loc. Niranohama in Utatsu-mura. Miyagi Pref.
Pro/ocarclia kurunu.>nsis HAY AMI, new species ................................................................... p. 19-1
Fig. 5. Left valve, holotypc (MM 2803) x 2. Loc. Shinatani.
Fig. 6. Right internal mould, paratype (MM 2804) x 2. Loc. ditto.
Fig. 7. Right valve (deformed) (MM 2805) X 2. Loc. ditto.
Fig. 8. Right valve (deformed) (MM 2806) x 2. Loc. ditto.
Pleuromya has!Jidateusis HAYAMT. new species ................................................................ p. 195
Fig. 9. Left valve, holotype (l'vfl\1 2808) X l. Loc. Kanay:unadani in Omi-machi.
llommnya satoi HAY AMI, new species ............................................................................... p. 196
Fig. lOa-c. Bivalved internal mould, holotypc (MM 2810) X 1. Loc. Shinatani.
llomomya sp. indet. ......................................................................................................... p. 196
Fig. 11. Bivalved !lpecimen (MM 2811) X 1. Loc. unknown.
Thracia subrombica 1-fAYAMI, new species ......................................................................... p. 196
Fig. 12. Right valve, holotype (:t--.IM 2812) X 1. Loc. Niranohama.
Fig. 13. Left internal mould. paratype (Ml'vl 2814) X I. Loc. ditto.
Fig. 1-1. Right valve, paratype (1\IM 2813) X 1. Loc. ditto.
Thracia (?) sp. indet. ...................................................................................................... p. 197
Fig. 15. Left internal mould (l'vfl\1 2815) X 1. Loc. Shinatani.
Cuspidaria (?) a sp. indet. ............................................................................................. p. 197
Fig. 16. Left valve (l\IM 2817) X 3. Lnc. ditto.
Fig. 17. Left internal mould (MM 2819) x 2. Loc. ditto.
Fig. 18. Left internal mould (MM ~823) X 2. Lnc. ditto.
Fig. 19. Right internal mould (iviM 2818) X 2. Loc. ditto.
Cuspidaria (?) b sp. indet. . ............................................................................................ p. 198
Fig. 20. Left valve (MM 2820) x 3. Loc. Niranohama.
Fig. 21. Right valve (MM 2821) x 3. Loc. ditto.

Fig. 4.

All specimens here illustrated arc kept in the Geological Institute, University of Tokyo.

HAYAMI:

Liassic Pelecypods

Plate 28

19

15

C. UEKI photo.

Trans. Proc. Palaeont. Soc. Japan, N. S .. No. 30, pp. 201-210, pis. 29. ;{0. June ~0. 1958.

3:18.

SPECIES OF THE GENUS NEPTUNEA FROM THE
PALAEOGF:NE FORMATIONS IN TilE KUSHLROCOAL FIELD. HOKKAIDO. JAPAN*
MASARU MATSUI

Department of Geology and Mineralogy, Faculty of Science. Hokkaido University----~~-:ltlliiQ~li!tt/,i,:ffi'i!i~l~~lf4vP.o:> Neptu11ea ~ft1'i: ~li!ltif{ffi0i 1 i~~{CfM. iillrlle'lltf:H .t v:1nm~mr=.i!E-t 7.> N••Ptzmea 1/ij~~;{;Jt..,.. 9 t'TI~it2~ (5 Wrfill~-" t.r) ilt.J:I~~;t;;c t~t '· ~v-tt-r. Ul<

Go:>~Ho:>~m~~~~~~~~~"mnasho\\'S certainly to have been depositedunder the brackish- or sea-water. The
Tenneru formation (U 3 ) is also locally
represented by marine facies and contains molluscs. although they are lessnumerous than those of the Sitakara
formation.
Now. for all these marine formations
as well as marine intercalations above
noted, the specific distribution of thegenus Nep/unea can be tabulated as in
the following table (Table II).
Before going into the description. thewriter wishes to record his hearty
thanks to Prof. rvlasao MtNATO, theDepartment of Geology and Mineralogy,
Hokkaido University. for his kind reading of the manuscript. For the helpful
criticisms thanks are also offered to
Messrs. Satoru UozuMI, Tsutomu FuJIE,
a Iso of the same Department of the
Univ., and to 1'11·. Tosio YAMAMoTo, ageologist of the Mciji Coal Mining
Company.
This study has been financed by
grants from the Science Research Fundof the .Ministry of Education, to which
the writer acknowledges his indebtedness.

Nine species bPionging to the genus
Neplunea, the typical cold water clements of the so-called Poronai fauna.
will be described in this short note.
All these specimens at hand have beencollected by the members of the Department of Geology and l\lineralogy. including the present writer. They were
found in various horizons of the Palaeogene deposits developed widely in Kushiro coal field. southeastern Hokkaido.
which are usually regarded to be elivisible into main two divisions, the Urahoro and the Onbetsu formations respectively (See Table l). Of them, theOnbetsu group is exclusively represented by the marine facies. having numerous molluscan fossils. It probably covers the former conformably. and may
be subdivided into four formations (0n 1-On 1 in Table I) from its lithologicalfacies.
The Urahoro group consists
mostly of the coal measures and thickbedded conglomerates of terrestrial origin; it is relatively poor in marine
facies. except for the so-called Sitakara
formation (U,). of which fossil content* Rl·ceived July 15, l!J57: n~ad June 15. 1957.
201

l~

Table I.

Group

Formation

~~--

0

::l

0'

~

"'c
..,Cl

0
<:
'0

--·

LithologyJ_____ 1Thi_c_k_ness

I~Grc;ish compact hard shale, intercalating
Chokubetsu:(On,) , black sandstone patches.
,_'I:)a'rk- grey-tilffaceous sandst(mc. contammg
pyroclastic.grains, and sometimes intercalaNuibetsu
ted thin aggrorneratc in the middle and(Ona)_Lipper parts.

I'Charo(OnJ

Dark grey mudstone. intercalated marlylayers and nodules, calcareous bands. thinwhite tuff.

---c;reenish sanostr>l1e. intcrc;ltatmg tflln conglomerate at basal part; upper part gradually bccon:es rine grained and transits(Un 1 )to On"----Grey siltstone, sandstone, thin conglomeraShakubctsu
te, intercalated coal seams. Conglomerate(li 11 )contains white volcanic pebbks.
Omagari

1(U,)

Dark grey siltstone, platy greenish grey
sandstone intercalating thin tine grained
conglomerate.

c::

Yubetsu

Greyish sandstone, dark grey siltstone,
reddish conglomerate, intercalating coal

;:;

g
...,

(U,)

sean1s.

·200m.

marine300

marine250

marine60

marir1eYoldia lauda/Jilis YoK.
Pvrtlmulia zmtasl'i KAN.
Thvasira bisect a CoN R.
Perij>loma bess!we11.~is (YoK.)Ve11ericardia akagii KAN.
" Tapes" ezoensis YoK .
Malfetia poronaica (YOK.)
Trodwcerithum ll'ltdmmm (YoK)
Ncptunea onbetsue11sis MATSUI
A11r'islrolepis jaj>OIIims TAlC
Callia11assa muratai NAG.

250

Cor/lieu/a tokudai (YoK.)
Batissa sitakaraemis (Suz.)

terrestrial

;

(Ua)

c

'0

Reddish conglomerate, intercalating greyish
sandstone patches and thin coal seams.

200

I

Nemocardium-yokoy(IJiiaiTAK.
Af;vr greu·iugki MAK.
Neptunea sitakarensis MATSUI

marine"'c:brackish _ _!-in/Ilia Yf!!_Soensis :\h:o;ATO
I
Batissa sitakaraensis (Suz.)
terrestrial I Cor/Jicula tolmdai (YoK.)
Ostrea pmegraz•itesla TAre

300

•

200

(marinein eastern, part)-----Harutori~

Ostrr•a j>raegrat•itesta TAK.

1

Tenneru~...c~brackish-

0

Cl

t.:

Facie~ _ _ _ _ _ _ _JV_ra_i_n_f_"_s_s__
ii_s_ _ _~.

brackish- I
Shitakara

0Classification o( Palaeogene Sediments of the Kushiro Coal Field.

(U~)

Greyish sandstone and dark grey mudstone,
intercalating coal scams.

100

Beppo
(U,)

Blackish conglomerate intercalating grey
sandstone patches.

50

I terrestrial

1

terrestrial

-

---

-·

________ I

Nemocardium yokoyamai TAK.
Papyridea cfr. harrimanii DALLi

Alya greu:ingki MAK.

lVePittnea sitakarensis MAT·---~~I

~03

Species of the genus Neptunea from the Palacogcrw Formations
Table II.
SpeciesGeological Oc..:urrcnc~

Nepttmea sp.
N. silakarensis MATSUI n. sp.
N. sltornensis MATSUI n. sp.
]1{. lmruha/ai 1\]ATSUI n. sp.
.~v·. morkstoidea TAKEDA
N. e;;oana TAKEDA
N. subwrinata MATSUI n. sp.
N. rmlwtsuensis MATSUI n. sp.
]\[, dis par TAKE PA

I u.

1-,f-1.
__1 _ _

Family Neptuneiclae

Genus Nej>lrmea (BoLTEN)
RoEiliNG,

1798

Genotype: Fitsus antictms LINNAEus.
NePitmea sp.
Plate 29, Figures I a, lb.

Shell large, fusiform. spire elevated;each whorl has wide tabulation which
is separated from the canaliculated
suture; tabulated area slopes gently
down to the shoulder. Apex and ante·rior part of the body whorl unfort unately missing.
Dimensions :-Apical angle about 55°,
height of the shell about G2 mm.. atleast so far as the preserved part isconcerned. however it might be foundto have originally reached as much as
75 mm. if the shell were in complete
state of preservation.
Occurrrnce :-0,1 :Senposhi.
( >boromura. 1\ ushiro Prov .. (Col I. I. HAY Asm)
Repository :-U. II. Reg. No. 12669 !U.
H.-Dept. Geol. l'vlin .. Fac. sci .. Hokkaido
Univ .. Sapporo).
Remarlls:-The only single specimen
for this species is at the writer's
disposal for study. It is illustrated in

1

I

I- __f __I!

-1- ..

··----·1

--I

I

i

·-J
fig. l, on Pl. 29. The present specimen
is doubt lcssly quite unique in its outlineof shell. and in this regard easily
separable from all the hitherto known
fossil species of the genus .!lleplunea.
However. it seems to the present writer
to be rather closely allied to the shelldescribed by B. C. CLAr<K under thename of N aff. tabula/us from the
Palaeogene of i\ Iaska, although the testis almost completely exfoliated both in
the japanese and Alaskan specimens,
and it may not be at all reasonable togive a name for such an imperfectmaterial.
Neptunea sitakarensis l\lATsm n. sp.
Plate ~9. Figures 2a. 2b, 3. 4.

Shell rather small. thin tested, witha high spire. the height of which is
sub-equal to that of the aperture.
Apical angle about 52°; whorls five to
six in number. separated from one another by distinct, more or less canaliculated sutures. The protoconch is composed of one or one and half turns of
the whorl, which is smooth on the outersurface. The other whorls moderately
convex with each other, usually inclis·
tinctly but sometimes distinctly shouldered atabout the midpoint of ~he depth;

204

Masaru MATSUI

upper surface more or less flattened.
IO\\'L'r surface below
the shoulder
slightly convex and nearly vertical.
The ornamentation of each whorl consists of a few spiral ribs, alternatingwith secondary fine striae; three ribs
and two secondary striae usually observable on the third whorl, while there
are four to five ribs alternating withthe secondary striae on the fifth andbody whorls. Spiral ribs are usually
narrow, moderately elevated, rounded
on top. and sharply defined from thebroad interspaecs; the uppermost rib isweakly developed in the fifth and bodywhorls. which is somewhat more nearly
disposed to the upper suture; the secoml one is situated at about the middle of the upper surface; I he third one
forms the shoulder itself. and the tift h
is slightly abO\·e the latter suture.
Body whorl is large. bluntly shouldered, convex at the sides: it becomes gradually narrow towards the anterior extremity and is spirally ribbed; basal
part is ornamented with eight to ten
spiral ribs. which are slightly narrower
and weaker than those on the convex
part of the whorl; aperture subpointecl
posteriorly; inner lip excavated; columella slightly bent outward; anterior
canal rather short and narrow.

shiro Prov .. (l'vli-rAN1's Loc. no.
Coli. K. MITANr),, 226.
: Kamishoro, Shoro mura. Kushiro Prov.
Repositm:v :- U. l-1. Reg. No. 12674,
12679. 12701.
Remarlls :-These specimens now athand closely resemble Chrysodomus
1·hikuzcnensis NAGAo described and illustrated by T. NAGAo from the Yamaga
beds of the Chikuho Coal Field, island
oi Kyushu. Japan. However. the former
species may be specirically distinguishable from the latter in having a shellwith the whorl ornamented by secondary spiral striae in addition to spiralribs.

8ucrinmn

match~Jarense~'IAKIYAJ\IA

described by 1\L-\KIYAMA from l'vlatchgar
and Yotukura, seems also to be nearly
allied to the present form in respect
to the features of upper whorls, but
lVIAKIYAMA's species is genetically distinct from the present form. now underconsideration, in its shorter columella.
Nept unea oomurai OTUK A shows a I soclose similarity to the present form,
especially in its outer form, but former
has more numerous spiral ribs on thewhorls than the latter and has finelongitudinal costae on the post-embryonal whorls.

Dimensions:lvTePfrmea slroroensis MATSUI n. sp.
!IeightMax. Diam.

Apic Ang.

20 mm.
23
21 "

53'
51'
52'

Plate 29, Figures 5a. 5b, 6a. lib.
37mm.
38
36 "

..

..

---Occurrences:U3: Senposhi. Oboro mura, Kushiro
Ptov., (Coli. I. HAYASHI)
U,: Ponshitakara
gawa. Akan
mura. Kushiro Prov. (MATsm's
Loc. no. 68. Coli. T. FuJm)
On 2 : Takinoue, Shoro mura, Ku-

Shell fusiform, with moderately elevated spiral whorls. apical angle about
45°; whods five in number, separated
from one another by a distinct suture.
Each whorl distinctly angulaled ata little above the middle; uppersurface slightly concave and inclined
outwards: lower surface almost flat·
lened.
Ornamentation consisting offour spiral ribs and numerous fine

205

Species of the genus Nep11111ea fro111 the Palaeogene Formations

crowded lines of growth; spiral ribs
rather .flat and broad: two upper ribson the upper surface are weak and sometimes indistinct; the lower two arestrong and more highly elevated thanthe upper two: the third located on
the shoulder itself. while the fourth issituated on the middle of the lower
surface; body whorl is large. muchhigher than the spire, distinctly but
more or less round shouldered, convex
below the shoulder and becomes gradually narrow downwards; the base isornamented by ten to twelve spiral ribs
which are more crowded than those of
convex parts. Aperture elongate. \vithrather oblique anterior canal; outer lip
thin; inner lip excavated by a thick
twisted columella.

Dimensions:HeightMax. Diam.

A pic. An g.

-----

49 mm.

38mm.

47'

..
..
48 ..

..

-!4'

..

45'

65

·10

59

38

----

(28)

..

-----

45°
-

Occurrences:U3: Senposhi. Oboro mura. Kushiro Prov. (Coli. I. IIAYASIII)
U,: Ponshitakara gawa,
Akan
mura. 1\ushiro Prov. (l'vlATsUI·s
Loc. no. 68. Coli. T. FuJtE)
11: Shoro Coal Mine. Shoro muar.
Kushiro Prov.
11: 1\.amishoro. Shoro mura.
Kushiro Prov.
Repository :-U. II. Reg. No. 12613.
12675. 12676, 12678.
Remarks :-These specimens are characteristic in respect to the high spire.
moderately rounded whorls. three tofive spiral ribs and secondary striae
between them on each upper whorl.
This form is quite unique in its outerform especially in its high spire. elon- ·gate aperture and distinctly angulatedshoulder in each whorl. and easily
separable from all the hitherto known
species in japan, either fossil orliving. But the present form is akinto Cln:vsodomus a/lispiratus NAGAo which
was reported by NAGAo from the Doshi
beds of the Asakura Coal Field, Kyush u, in its shouldered outer form. Yet
the present form is also specificallydistinguishable from the latter in having a larger shell, and a longer anterior
canal.

Neptunea lmruhatai ·.l\IATsut n. sp.
Plate 29, Figures 7a, 7b. Sa, Sb.

Shell moderate sized. spire highwith more than five rounded whorls
besides the embryonal part which isunfortunately lacking.
Entire shell
spirally sculptured. w·horls separated
by abutting tlnc sutures, which areequal in size and gently elevated. The
uppermost rib lies close to the upper
suture, and the fifth one slightly above
the lower suture. There are also twoor three fine secondary spiral striae
in each interval of the spiral ribs. theformer become gradually narrower
downwards. Aperture rhomboidal inform. canal short and slightly recun'ed.
Dimensions:Height.

(62 mm.) upper

whorls lost

11\lax. Diarn~

Apic. Ang.

30 mm

35 o

'

·

Occurrences:U.,: Ponshitakara gawa. Akan
mura. 1\ushiro Prov. (1\IATSUI'S
Loc. no. 68. Coli. T. FuJII·:)" : Shitakara gawa. Akan mura,
Kushiro Prov. (MATsm's Loc. no.
33)
II: Shcno Coall\·1ine., Shoro mura,
Kushiro l'rov.

266

tv1asaru MATsui

Repositmy :-U. II. Reg. No. 12670.
1267l, 12691, 12692.
Remarks:- This species shows a muchsmaller apical angle and possesses amuch higher spire than those of any
hitherto known japanese species belonging to this genus Neptunea. Further
the features of aperture and canal of
the present species are chrysodomid.
Neptunea landesi (TEGLANo). describedby C. W. WEAVER from the Tertiary
formation of the western coast. North
America. is somewhat all i('d to the present species in respect to the high spireand small apical angle. but the former
has a heavy revolving keel on the posterior whorls. and such features arewholy absent in the latter.
Nept unea modest oidea TAKE uA
Plate 30. Figures Ia. lb.
1953.

1Veptun£'a modus/oidea, TAKEDA, Studies

on Coal Ceo/., No. ::J, pp. 53-5-l, Pl. III,. figs. 1-7.

Shell moderate in size. fusiform, withhigh spire, about six well-rounded
whorls. surface ornamented by five tosix spiral ribs and many fine striae on
and between the main threads. Aperture elongated and canal slightly
recurved.
Heighti Max. Diam.

---~-(3~) mm.) upper~·whorl lost
(53 " ) ..

1Vept unea ezoana TAKEDA!'late 30, Figure .J.
1953.

Dimensions:-

Remarks :-This form seems to bequite rare species in Hokkaido; H.
TAKEDA described it mainly on thebasis of specimens from South Sakhalin,and single specimen collected from On,
in Kushiro coal field.
The writer was also able to examine
only five specimens for this species
collected from U, and On 3 in the Kushiro coal field. Although the surface
ornamentation of I he hololype of thisspecies was unobservable from its poor
preservation and the anterior parts ofthe body whorl are lacking. the illu·
strated specimens in this paper show
characteristic numerous fine spiralstriae to cover the whole outer surfaceof the shell, and the aperture ·to beelongated. while the canal is slightly recurved.
Neptunea hobetsuensis IIAYASAKA and
i\fATsut is doubtlessly allied to the present form. but whorls of the former
are more highly convex than that of
the latter. I he spiral ribs of the former
increase in according with its growthstage. but in the present species thenumber of ribs is almost constant.

I

Apic. Ang.
-

- -

55"

3G mm.
I

about 50'

Occurrences:V5: Ponshitakara gawa. Akan
mura, Kushiro Prov. (l'VIATsut 's
Loc. no. 68, Coli. T. FuJm)
On 3 : Nuibetsu. Shiranuka mura.
Kushiro Prov.
Nepository:-V. H.Reg. No. 12672, 1269,!.

Neptzmea ezoaua. TAKEDA, Studies 011
Coal Geo/., No. 3, pp. 52-53. Pl. II. figs.
1, 3 & 6.

Orif.{ina/ Description (TAKEDA 19:13):"Shell moderate, fusiform, rather thin,high turreted. spire same or higher
than aperture; apex subacute. apicalangle about 52°: whorls 7, convex but
roundly shouldered. which is distinCt
on middle whorls. each whorl separated
by distinct suture. Ornamentation consists of '1 spiral ribs (on fourth and~ixth whorl) with numerous crowded
growth lines; body whorl large, inflated

Spccies of the genus NejJ!wwa from the Palaeogene Formations

but abruplly tapering towards end;
canal rather short. slightly curved.
Spiral ribs narrow, elevated. sharp;
third rib strongest and situated onshoulders. Sometimes a fifth rib appears
nearer to next suture. At the last whorl
10 ribs and one or two short perceptible
ones on siphonal margin of outer lip.
Secondary feeble ribs sometimes appe·ar bet ween each of the main ribs andthe new ones are near to the upper
suture. In this case the total numberof ribs is 8, but the four main ribs
strongly on internal mould.
Space between upper suture andshouldered portion sometimes flat.
gently sloping or slightly concave.
which is clearly shown on internalmould by the feeble condition of firstand second spiral ribs".

Dimensions:llcight207

are ornamented with thirteen or four·teen ribs and numerous weak spiralstriae between the main ribs on the
body whorl. The aperture of them ismoderately wide, outer lip is thin, inner
lip is excavated by thick tested columella, canal is narrow and notchedanteriorly.
This species somewhat resembles N.
onbetsucnsis l\IATsvt but the former is
specifically distinguishable from thelatter by its less convex, smaller bodywhorl. and by its four strong and one
feeble spiral ribs.
N. oomurai Onn<A reported from Te·shio Prov .. Northern llokkaido is also
another species allied to this form. but
it has more simple spiral ribs and shows
strong angularity in the whorls.

Neplunea subcarinata l'VlATsut n. sp.
Max. Diam.

(65 mm.) apex
and extremity
lost
(?
) "
"
(92 " ) "(95 " ) "1

Apic. Ang.

43mm.

52°

46
56
55

55;>
51'
~3'

Occurrences:U,,: Kamiatsunai. Otsu mura. To·
kachi Prov. (Coli. Shoichi NisHt·
oA)
On,: Takinoue, Shoro mura. Ku·
shiro Prov. (MJTANI's Loc. no.
226)": Teshibetsu gawa. Teshibetsu
mura, Kushiro P!tlV. (lVL<\.TsuJ's
Loc. no. 138, Coli. T. FunE)
Repository :-U. H. Reg. No. 12680,
12G87, 12G88, 12700.

Remarf,•s :-Only four specimens of
this species are available to the writer.
They were collected from U, and On~
in the Kushiro coal field. All of them

Pbte 30. Figure~ 2, 3a, 3b.

Shell strong, solid, ovalo-fusiform.
whorls about six. Each whorl convex
and prominently shouldered. Th.e upper surface of the whorls flat or gently
concave. ornamented by three weakspiral ribs. The fourth rib. at shoulder itself. strong and prominent. Lower
surface of the whorl nearly vertical.
The fifth spiral rib almost mid-pointof the lower surface. On the fourthand fifth whorls, there are four or five
fine feeble spiral striae between eachmain ribs. Suture distinct. Aperture
medium in size, ovate. angulatcd above;outer I ip distinctly angulated by thecarination of the body whorl. Canal_short, wide. turning to the left, ending
in a well-marked notch.
Occurrences:On1: Kamiatsunai. Otsu mura, To·kachi Prov. (Coli. J IsHII)
On,.: Kamishoro. Shoro··mura, K u·
shiro Prov.

Masaru MATSUI208
Height!Vlax. Diam.

[Apic. •\ng.
- - -

60"

55mm.
( 42 .. ) upper
whorl lo::;t

30 mm.

61"(47 .. )

"

30

61''

(36 " )
(53 " )

"
"

~8

561)

3i

60"

On~:

Teshibctsu gawa, Teshibetsu
mura, Kushiro Prov. (MAT:mr'sLoc. no. 148, Coli. T. FuJm)
Repository :-U. H. Reg. No. 1~681.
12683, 1268:1, 12685, 12686.

Remarlls :-These sharply-keeled specimens may be perhaps specifically
identical with the form described by
H. TAKEDA under the name of Nept unea
subantiquata MARToN and RAcKETT from
Rosukezawa south Sakhalin; nevertheless they are doubtlessly distinct fromthe species Neptzmea subantiquata MAw
TON and RAcKETT, now living in thesea around the circum-polar region, by
their more distinct shoulders and three
spiral rils on the upper surface on eachwhorl. However N. interscu/jJta described by 1-L"-Rl\IER seems to be somewhat
allied to the present form but for thefact that the former has more convex
whorls and conspicuous secondary spiralstriae.
Neptunea oubetsuensis l\lATsur n. sp.
Plate 30, Figures 5, 6a, Gb.

Shell strong. solid. ovato-fusiform,
spire comparatively high; whorls six
to seven, round shouldered; the lastventricose about two-thirds the totalheight of the shell: spiral angle 55°.

The outer surface sculptured by three,rather broad, moderately elevated, flattopped ribs; of them, uppermost rib
lies on the shoulder itself. The bodywhorl is ornamented by about ten to
twelve strong spiral ribs. increasingly
densely arranged towards the base of
the shell. Each whorl has numerous
finely crowded growth lines on therather broad interspaces of the spiralribs. Suture distinct; aperture large,
ovate in form, angulate above; total
length of the aperture plus canal reaches more than half the length of theshell; outer lip expanded outwards andregularly curved. not distinctly angulated by the carination of the bodywhorl; inner lip excavated by thick
twisted columella, which is rather shortand slightly bent outwards; canal short,wide. more or less strongly turning to
the left of the aperture.
Dimensions:HeightMax. Diam.

Apk. An g.

--------

85mm.

52 mn1.

8()

59

"

I

6~

(86 " ) upper
whorl lost
102

"

I

(86 ) upper
whorl &
extremity lost
83 "

"
"

5'1"
56'
55"

56"

58

"

58

"

56"

56

..

58"

Occurrences:On,: Kamiatsunai. Otsu mura,
Tokachi Prov. (CoiL ]. lsmr)
On~: Takinoue. Shoro mura, Kushiro Prov. (l'vlrTANI's Loc. no.
~66, Coli. T. FuJrE)
IITeshibetsu gawa, Teshibetsu

Explanation of Pbte 2<J (All ligures arc in natural size)
Figs. la, lb. Neptunea sp.
Figs. 2a, 2b, 3, 4. Neptunea sitakarensis n. sp.

Figs. 5a, 5b, 6a, 6b.
Figs. 7a, ib, Sa, 8b.

JVeptunea shoroensis n. sp.
1'-leplunea lmrulratai n. sp.

MA.Tsur: Palaeogene Mollusca
Plate 29

S. KuMA.No pohto.

Species of the genus Neptunea from the Palaeogene Formations

mura. Kushiro Prov. crviATSUI'S
Loc. no. 1·18)
On~: Kamishoro, Shoro mura, Kushiro Prov.
Repository :-U. H. Reg. No. 12695.
12696, 12697. 12698, 12699.
Remarks :-So far as the writer isa ware, this form is specifically distinguishable from all hitherto known
species of this genus by its large convex body whorl. three strong spiralribs on the upper whorls and rather
short bent canal.
The specimens now at hand are rather
closely akin to Neptwzea ezoana TAKEoA.
collected in association with the former;
however the present specimens haveshells more convex in larger bodywhorl, with three strong spiral ribs,
besides, the former have generally
larger shells than the latter.
N. oomurai 0TuKA is also anotherspecies allied to the present form in
respect to the outer shape. but thepreceding species has weak spiral striae
on the whorls besides the ordinarilystrong ribs and a more faint suture.
Clzrysodomus modes/us KuRoDA, descri·
bed by KuRoDA from Nagano Prefecture
seems to be akin to this new form, hut
it has a lower spire. and is ornamented
with numerous spiral ribs.

JVeptzmca dispar TAKEDA
Plate 30. Figures 7a, 7b. Sa, 8b.
1953.

Neptunea tlispar. TAKEDA, Studies mr
Coal Geol., no. 3. p. 55. Pl. I. figs 2. 4,
8-1:~.

Original Description (TAKEDA 1953):"Shell medium. broadly fusiform, withhigh spire which is shorter than aperture and abruptly decreases in diameter
upwards; whorls 5 or 6, separated by
distinct suture. Early whorls convex.

209

rounded, but on later whorls usually distinctly showldered at about mid-point of
the depth, with upper surface flattened,slightly convex and gently sloping andlower surface nearly vertical, rather
concave on inner side. Ornamentationconsists of numerous spiral striae.
strong and weak irregularly mixed,
usually about 11 on upper surface of
the whorl. In addition to these spiralstriae, each whorl i;; ornamented bymany tubercles, about 12 on last whorl.
Tubercles sharp, pointed, situated onshoulder itself but becoming indistinct
nearer to mouth and. on the contrary,
one strong spiral rib running on that
portion which coincides with the middle
part of the wall. Extremity of canalchrysodomid.
Lower half of bodywhorl ornamented by a few rather
strong spiral ribs."

Dimensions:Height--Tl6 ml1!:) apex
& extremity
lost
(2•1

) "

i

I

Max. Diam.

1/\pic. Ang.

I ----

14 mm.

62,

20

56'

Occurrences:On3: Nuibetsu, Shiranuka mura.
Kushiro Prov.
? : Exact locality unknown. (upper
tributary of Charo gawa, Shiranuka mura. Kushiro Prov. (Coil.
Koya HIRANo)
Repositmy :-U. H. Reg. No. 12677.
12689.

Remarks:-The specimens minutely
examined by the writer were collectedfrom On 3 developing at Nuibetsu andupper tributary of Charo gawa (exact
locality unknown). Small shells are
somewhat broadly fusiform. with only
four whorls besides the embryonal
whorl which is unfortunately lacking.
Spiral striae about thirteen on upper

1\ilasaru MATSUI

210

surface of each whorl. Tubercles about
fourteen on last \Vhorl. Lower surfaceof the body whorl is ornamented by adistinct secondary keel with twelve or
thirteen weak tubercles. Except thedifferent number of tubercles and theexistence of a rather distinct secondary
keel in the present specimens. they are
doubtlessly similar to the holotype of
this species.
Hcfcrcnccs
CLARK. B. L. (193~). Fauna nf the Pout :1nd
Yakataga Formations of Southern Ala·ska. Bull. Geol. Soc. :1mcr.. Vol. 43, pp.
830-831. pl. 20, fig. 13.
l-IARI\IER, F. \V. (191-1), The Pliocene Mollus·
ca of Great Britain, Vol. 1, pp. 163-lli,!,pl. XVII, figs. 6, 7: pl. XXV. fig. 2, p.
166, pl. XVIII. fig. 5: pl. XXV. fig. l.
l-IAYASAKA. I. & l\IATSUI, .1\I. (1950). On some
Gastropoda from the Momijiyama For·mation. four. Fac. Sci., Hokkaido Unil• ..
Ser. IV. Vol. I. No . .J, p. 33:!, pl. I. fig. 1.
KuRODA, T. (1930). HOMI\t.•.:s Sinanotyubu
Tisitusi. pp. 78-19. pl. 13. fig. 109; pl. 14.
fig. 83.
MAKIYAMA. ]. (1934). The Asagaian Molluscs of Yotukura and rvlatchgar. i1lem.
Col/. Sci., Kyoto Unh•., Ser. B. Vol. 10,

No. 2, pp. 165-166, pl. VII. figs. 56. 57.
l\IATSUJ. M .. HuRUIIATA, Y. and Fu;m. T.
(1953). Geology of Yuhetsu Coal MineArea, Kushiro Coal Field. Bull. Geol. Com.
Holdwido. No. 22.
l\hNATO, M .. MATSUI. lVI., L'ozm.ll, S .. HURU·
IIATA. Y .. FUJIE, T. & HAYASHI. I. (1952).
1Nann crschicncn die Poronai Faunen zum
crstcnmal ? Proc. japan ..lead.. Vol. 28.
No./.
MITANJ. K. & Fum-:. T. (195·1). Geology of
Taldnouc Area. Shorn mura, Kushiro Coal
Field. Bull. Geol. Com. Hollkaido. No. 27.
NAGAO, T. (1928). Palaeogene Fossils of theIsland Kyushu, Japan. Part II. Sci. Rep.
Tohoku Unit•., Ser. 2, Vol. XII, No. 1, p.
108 (99). pl. XVII, figs. 10-12; pl. XV liT.
figs. 13. 13a.
0TUKA. Y. (19-!U). 1\Iioccnc Mollusca from
Teshio Prnv., Hokkaido, Japan. japan.
four. Geol. Geogr., Yo!. XVI!, Nos. 1-2, p.
98. figs. 5, 6.
TAKEDA, H. (195~). The Poronai Formation(01 igocene Tertiary) of Hokkaido andSouth Sakhalin and its Fossil Fauna.
Studies on Coat Ceo/.. No. 3, pp. 52-55, Pl.
I. figs. 2. 4, 8-12; pl. II, Jigs. 1. 3 & 6;
pl. III. figs. 1-7.
WEAVER, C. W. (19,12). Palaeontology of the
Marine Tertiary Formation of Oregon
and 'Vashington. Unit.>. Wash. Pub!.. Geol.,Vol. 5, pp. ·127-428, pl. 84, tigs. 7 & 12.

Explanation of Plate 30 (All figures arc· in natural size)
Figs. 1a. lb. Ncptunea modestoidea TAKEilA
Figs. 2. 3a. 3b. Neplunea subcariuala n. sp.
Fig. 4. Neptunea ezoaua TAKEDA

Figs. 5. 6a. 6b. Neptunea onbelsueusis n. sp.
Figs. Ia, 7b. Sa. Sh. Neptuuea disj1ar TAKEDA

MATsur: Palaeogene Moll usca
Pla te 30

S. KuMANo photo.

Trans. Proc. Palacont. Soc. Japan. N. S .. No. 30, pp. 211-21G. june 211, 1958:~:l9.

SOl\lE: CAMBRO-ORDOVICIAN FOSSILS FROM TilE

TAN'GY ANG OR TANYO DISTRICT. SOUTH KOREA*TEIICHI KOBAYASHI
Geological Institute. University of Tokyo

Y.~limP.Htl!Jj O)~ll't~~~ I~ 6 : #. :t~-~-.O)l*~/iiJ<i)? -; I'CJ:j~Ttili!l!l\lil;vi&U l·.tlll'~ift;f-O)fll\ ~ 0)l~fifJ:,;[itjjtJ~Ht.:.

-'CO)? -;r::. Kingstmzia. Plclhometopus. Iddingsia

J? c Jf<;::. /Jamashania (?) sp. 'e~~~,l~T 7...

The Cambro-Ordovician Chosen groupof the Tsuibon zone in the 1\.ogendo
Limestone l'latcau is very fossiliferous
in 1\angwondo or Kogendo. but becomesmuch less so in the Tan'gyangy ongch ·un (Tanyo- Eishun) District inthe southwest and almost unfossiliferous
in the 1\lun'gyong (Bunkei) District
further in the southwest. Therefore
the Tan'gyang collection before handis highly valuable. although it is asmall one. not well preserved. I am
greatefull to J\fr. Takuji SmRAKI who
has given me the collection. Beside
Hamasltania (?) sp .. three new species
are described here as follows:

Kings/onia

parallela

still tentative. they reveal remarkable
resemblances with the Croixan trilobites.
Berlwia is suggested for lddingsia (?)
slzantzmgensis KoDAYAsHI, as its propertaxonomic position.
Chosen System of the Tan'gyang
or Tanya District.

9.

Tsuibon limestone. about 50111. thick,represented by massive limestone
containing ormoceroicls (Tanyo 4)
and overlain by Koten series paraunconformably.
8. Chikunsan shale, 10-20 m. thick. or
dark gray shale containing ormoceroids (Tanya 7F).
7. r-.Iakkol limestone, 50-70 m. thick.
consists of vermicular limestone at
the top and thick massive limestone
below it.
6. Tomko] shale and limestone. 80-110
m. thick. Upper 50 meters composed mainly of light gray shale contammg
Finkelnburgia
saislzoensis(Tanyo 70 and 10) and lower 30-40
meters of well bedded limestone andvermicular limestone in alternation;
thin quartzite at the base.
5. Kasetsu group, 500 m. thick, com-

KoBAYAsm.

new species

Plet home! opus longispinus KoBAYASIII,
new species.
lddi ngsia

orienta/is

r::.Ji.q-t7.>Yfrf•HfJ:JJ..,f.:o -'CH
lj' H (.{ -KoBAYASHI,
new species

Although their generic references are*Received Oct. 7. 1956: read at the an·nual meeting of the Palaeontological Societyof japan at Scndai, Feb. I. 1958.
211

212

Teiichi KoJJAYAslll

posed of vermicular limestone, marland bedded limestone in alternations.
Dictyilcs zone in the upper part yields
Eom·this shakuotum•nsis (?)(Tanya 5).
Dictyites longicmula. lddingsia oricntalis, Hamashania (?) sp .. (Tanyo 7C).
P!etliometopus /ongispiuus (Tanyo 7E).
and A"ingstnuia para/lela (Tanyo 9).
Clmaugia zone in the lower part con·tains C/mangia tai/wlwr•llsis (Tanyo
7A). Billingsela pumpc//yi (Tan yo 7B).
:1. Seison (?) bed, about SUm. thick.
composed of quatzite. sandstone. thinbedded limestone and vermicular
limestone in alternation.
3. Taiki limestone. •100-500 m. thick.
or massive limestone with someintercalations of marl and shale.
2. Beiho slate. about 100m. thick, represented by bluish gray to black
coloured slate, phyll it ic or sandy inpart; thin lenses of w hi tc or pinklimestone intercalated in 3 or .J
horizons.
1. Sohsan quartzite. 50 to lOU m. thick.
white to light gray quartzite contammg round pebbles of whitequartzite and resting on gray gneissof Taihakusan series.

l.ist of Fossils
Tanyo •1.

Tanyo 5.
Tanyo 7.
7A.

7B.

'J 'sui bon Ii mestone
Small ormoccroid. gen. et sp.
indet.
Oictyi/es zone
t:uurt his shalmotunensis SuN

Clmangia zone
Clmangia tailiakuensis
YASIII (f'ygidium)
C'littllllgia zone
Hi IIi ugsel!a Jmmpe/lyi

KoJJA-

\VA v

COTT

7C.

7D.

!Jir:tyiles zone
Dictyitcs longicauda KoBAYAsHI (Pygidium)
ldclingsia orienta/is KoBAYASHI,
new species.
llmnasliania (?) sp.
Tomko! shale
Finlwlnlmrgia saishoensis (KoBAYASHI)

J)ictyit es zone
1'/et/iomf'lopus longispinus KoBAyASHI, new species
7F. Chikunsan shale
Ormoceroid. gen. ct sp. indet.
Tanyo 9. Dictyites zone
J\i11gstonia para/lela KoBAYA·
s111, new species.
Saukid, gen. et sp. indet.
Tanyo JO. Tomko! shale
Finlwlnlmrgia saislioensis (Ko7E.

BAYASHI)

List of Localities
Tanyo 4. Kich'on-ni, Kumgong-ni. Taegang-myon, Tan'gyang-kun.
Ch'ungch'ong-bukto. !i!J.fff~tin.J'H~ llf> 7dua Iii~ .fr11H£t:t .ffi.
Tanyo 5. Ditto.
Tanyo 7. Valley in the north of Hyl5nch'tin-ni.
Tan'gyang-mydn,
Tan'gyang-kun.
Ch'ungch'ong-bukto. Ca 3 km. northeast of Tan'gyang town andSome Cambro-Ordovician Fossils from Tan'gyang District

213

about 1~00 m. west of Surum·
san. .'<!!.rl'fJtillJ'l·IIJJJllll J'l·lllhilii:Y: JII.!ltlt1J<V:fr.

t't~l!l~t11l:1J¥'.J

3*f~P~tlJi!§)'j 1200 ~-Tanyo 9.

West side at the mid-way be·
tween Song-hyOn and Kosuri. Kagong-mybn, Tan'grangkun. Ch'ungch'bng-bukto. .'M.
ftdt.ifif'J.II~lnti:JH'ti!ii-!1W1~.

1

2b

2a

r!ii!lt

JHifliMJ@{UIJ.
Tanyo 10. Northwest L'nd of Kotim-dongvillage. 1\.agong-myon. Tan'gyang-kun.
Ch'ungch'tingbukto.
.~,ii'Jl'hi1~1t!lft-ftii6
1fi1Pitmr&~tVffil.

Family Ellipsocephalid:~e
MATTHEW,

1881
3

Subfamily Kingstoniinae
KonAv,\sHJ,

1!13:1(Family Plet.hopelt icbe
RA vMoNn.

1~nl)

Genus Kingslonia \V AJ.CoTT. 19~4

It is a question whether three Wanwanian species of Kingslonia arc correctly located at the genus. because
they occur in the too high beds. Ne\·ertheless. the associated pygidium of K.
semicircularis is evidently more allied
to that of Kiugstonia than the pygidiumof Leiocoryphe. It is probable that the
Wanwanian forms belong to a genus
distinctfrom
Kiugstonia. Rywmzia(WALCOTT.
1924). Leiocoryphe (CLARK,
1924). or Stralocepha/a (I{AvMoNn. 1937).

Kingstonia paral/e/a KonAYASHI.
new species.
Text-figures 2a-b.

Description :-Cephalon semi-circular.
regularly and strongly convex, culminating toward a point a little posterior

4
Ex pl:Jnat ion of Text-figures

Fig. 1. lddiu~sia orienta/is KoBAYASHI,
new species. Tanyu I; X 2
Figs. 2a-b. 1\iul:slonia !ongispimts KonA·
YASIII, ucw species.
Dorsal and Lateral\'iews: Tan yo 9; X 3
Fig. 3. l'lethomelopus spiuU'erus I<oBA·
YASIII. new species. Tanyo 7: X -1
Fig. 4. llamaslumia ( ?) sp. Tan yo I;
X 1.;)

to center; no glabellar furrmv; eyes
and facial sutures indiscernible; occipital furrow impressed very faintly;
breadth of glabella marked only by apair of pits on occipital margin; checks
narrower than a half of glabella: genal
end pointed. but not protruded into aspine; surface smooth.
Comparison :-This has a broader
glabella than any of the three Wanwanian species of Kingstonia (?). It
looks very similar to Leiocoryphe p!atycephala KouAY Asm (1935) from Nevada
and L. I rflllSN!/'Sa RAsETTI (1 944). This
species is easily distinguished fromthem by its nearly straight anterior

Teiichi KoBAYASHI

211

and posterior margins which are subparallel to each other.
Occurrence:- Tan yo 9.

(Family Burnctiidae Rr-:ss1m, 1942)
Genus Iddingsia WALCOTT, 1924
lddingsia orienta/is KoBAYAsHI,

Genus Plcthometopus ULRICH. 1931

new species

Pie/ hometopus longispimts

Text-figure 1.

KoBAYAsHI.

new species

Text.figurc 3.

Description :-Cranidium subtriangular. but truncated in front. gently convex and practically unfurrowed except
a very shallow occipital furrow: nuchal
spine stout, very long, somewhat angulated along the axis and more or lessdepressed on both sides of its root where
it is well expanded laterally.
The
lateral outline is somewhat incised twar
the mid-length of the cranidium wherea small eye may be present. but it is
not clearly discernible. The facial suture appears possibly proparian, but
the specimen is not so well preserved
I hat this nature can be warranted.
In the narrow outline of the cranidium
this species agrees better with Stenopi/us than 1'/ethomelopus. In the low
convexity of the cranidium and thepresence of a nuchal spine it is quitedistinct from the hitherto known species of Stenopi/us and more allied to
1'/ethometopus. The spine is, however,unusually long. Arapafloia 1\ltLLER. Hl36,
i.e. Hesperaspis SToYANow, 1936. hassuch a spine. but the glabella is always
distinctly outlined. The facial sutureis opisthoparian in Ampa/mia, Stenopi/us
and Plctlmmrtopus. It turns out a new
genus. if its proparian suture be ascertained.
Occurrence :-Tanyo 7E.

Family Solenopleuridae ANGELIN. 18!14
Subfamily Dokimocephalinae
KoBA Y Asm, 19:~5

DescrijJtio11 :-Glabella large, convex,
conical. truncated in front, and provided
with two pairs of strong oblique furrows; anterior glabellar furrows rudimentary. and visible as pits only by crosslight: occipital furrow profound: occipital ring thickened mesially: fixedchecks very narrow; eyes medium insize and set close to glabella at its rpidlength; preglabcllar field gently in·clinecl and divided into a fontal limb
and rim of subequal length; rim nearly Oat: facial sutures diagonally issuing from eyes; test rough, but nongranulose.
Comparison :-The glabella outline is
subsquare in this species. but it is wellrounded in front in I. robusta (WALCoTT)
as well as /. simi/is (W AI.CoTT). The
frontal border is often broader than thefrontal rim in lddingsia (REssER, 1942).
It resembles Maladioides in the glabellar
aspect. but the fixed cheek is much narrower.
Ot'l:urrence :-'L1nyo 7C.

Genus Berkeia REssER, 1937
H(?rkeia shant ungensis (KonAY ASHI)
1935.

fddingsia (?) .~hmztungeusi.~ 1\onAYASHJ,
japan. ]our. (,'('{)/. Geogr .. l'ol. 12. p. 25,
pl. 6, fig. 4.

In this species the frontal rim is lessthan half the length of the frontal limb
and gently convex, instead of nearly fiat
in lddingsia. In these aspects and others
it fits in Berkeia. The relatively small
glabella is its important distinction fromSome Cambro-Ordovician Fossils from Tan'gyang District
American species of the genus.
Occurrence:- Tsi11aia zone; west of
Tsinanfu. Shantung.

215

species.

Occurrence :-Tanyo 7C.
References

Family Dikelocephalidae l\lJLLEI~. 1887
Subfamily Saukinae

Uuucu and REssER. 1933c;cnus Hamaslumia KoBAY A Sill. 1942
HJ-12.

1/ama.wmia KnBAYASIII. jour. Gwl. Soc.
japan, Vol. 49. p. 118.

Insofar as I am aware, ;l1areda is theclosest relative to this genus. They
have
similar longmultisegmented
pygidia. but the pygidium of I!. j>uklira
can be distinguished from that or M.
mulwzegata KoBAYAsNI (19-!2). in its sut:quadrate outline, posterior expansion,a smaller number of axial rings. more
flattened pleural lobes. absence of interpleural grooves and presence of a narrowmarginal rim. They are contemporaries.
It is further iwtewort hy that the fragmentary cranidium associated with thetype pygidium or Ilamashania jmlchm
agrees with that of Lichengia onigawara
KonAYAsm (1942) i 11 the broad glabella,strong posterior furrow and especiallyin the large posterior plapebral lobe.
Distribution :-Daizanian or middle Upper Cambrian of Eastern Asia (Jehol and? South Korea).

Hamaslumia (?) sp.
Text-figure 4.
Though fragmentary, this pygidium
is of special interest because it shows
close affinity to the rare species. lfamashania pulclzra in the long outline andvery oblique and fiat-topped pleural
bands. The axial lobe, however. tapers
more slowly in this species than in thatT. H. (1924), The Paleontology of
Beekmantown Series at Levis, Quebec.
/1u/l ..4m. l'a/., Vol. 10, No. ·11.
KoBAYASIIJ. T. (1933), Faunal Study of the
Wanwanian (Basal Ordovician) Series
with Special Notes on the Ribeiridae
and the Ellesmcrcoceroids. jour. Fac. Sci.
Imp. Unir. Tokyo. Sci. 2, Vol. 3, l't. 7.
- - (1935 A), The /Jriscoia Fauna of theLate Upper Cambrian in Alaska with
Description of a few Upper Cambrian
Trilobites from Montana and Ne\·ada.
japan. ]our. GC'ol. (,'teo.f{r., Vol. II.
- - (193:; B), On the l'hylogeny of Primitive
Nautiloids wit!~ Description of l'lcc/ro·
noceras liaolungcl/se, new species andJtltlin~:sia (?) slumlllll.f[ellsis. new species.
Ibid .. Vol. 12.
- - (194~). Two New Trilobites Genera,
1/amas/wnia and 1\'irke//a. jour. Gf'ol. Soc.
japan. Vol. 49.
1\IILI.ER, R. M. (1936). Cambrian Trilobitesfrom Northeastern Wyoming. four. Pal.,
Vol. 10.
RASETTI. F. (19H),
llpper Cambrian Trilobites from Levis Conglomerate. Ibid.,
Vol. 18.
- - (194!1). Description supplemcnlaire deTrois Genres de Trilobites Cambriens.
Cmwd. Natural., Vol. 72.
RAYMOND, P. E. (1924). New Upper Cambrianand Lower Ordovician Trilobites from
Vermont. Pror:. Hoston S'oc. 1\lat. !fist.,Vol. 37.
- - (1937). Upper Cambrian and Lower Ordo·\'ician Trilobites and Ostracoda from
Vermont. Bull. Grot. Soc. Am.. Vol. 48.
REssJm, C.D. (1937). Third Contribution to
Nomenclature of Cambrian Trilobites.
Smiths. ,Uisc. Col/., Vol. 95, No. 22.
- - (1942). New UpJJl'l' Cambrian Trilobites.

CLAI~K.

Ibid., Fol. 103, No. !>.

SToYANow. A. A. (1936), Correlation of Arizona Palaeozoic Formations. Bull. Ceo/.
Soc. ilm., Vol. 47.

216

Tciichi KoBAYASHIULRICH, E. 0. (1931). Trilobites in J. BIHDGE's
Geology of the Eminence and Cardarcva
Quadrangle. Alissouri Bur. Gt'ol. Mines ..
2d Ser .. Vol. 24.
WALCOTT. C. D. (1924). Cambrian and Lower

Ozark ian Tri lobi lcs. Smiths. Misc. Col/.,Vol. 75, No. 2.
- - (1925), Cambrian and Ozarkian TriJo.
bites. Ibid .. Vol. 75. No .•1.

Trans. Proc. Palacont. Soc. Japan. N. S.. No. 30. pp. 217-219. pl. 31, June 20, 1958

340.

.. MONOPllYLLITES" ARAKURENSIS SP. NOV.

FROM THE l\fAIZURU ZONE*KEIJI NAKAZAWA
Geological and Mineralogical Institute. UniYersity of Kyoto••u&m0 .. Mouopltyllites" arakureusis n. sp.:{iCJIIllll0ili!!lii/ffiilflC.;IH~~~r.~bt'l. ;i5 jtl(lMonophyllitidac I<::.Jill"t" J., 1rUt:i 2 fiJ!O),l[]il~~ l.; ~~" C. 0)1t(jt:jl;l: Neo·Trias .a_.7f;T t 0)!.!J.bt1., Meso· Trias <Dill/ 'P.llll (Jr:ltl'l.:~Ji:ft"lilf) .t 1J fi L;~' t a:n:JJ 1.>. ~ ~ l;:jifijJUJo:>II\JI<:ml'JlUJ(earliest Carnian or Ladino.Carnian) ~;tttt?.. C: ~tli!-~l.;t~iJ!, C: ;flli.:=tt~~Jjf{(··:Ht 1.. to:>-c@i)> ~.>/ml..d~

c

c

~~0

~

fi

*

the Arakura formation is considered tobe younger than the Zohoin gruup in
Shikoku, the type of Fujinohiran. which
is characterized by an undoubted late
Ladinian faunule composed of Protmchyceras aff. arche!aus (LAulm), 111onophyl!itrs
sp .. Daonella lwtoi MoJsisovics. D. sakawana MoJ., etc. On the other side, theArakura formation is evidently older
than the superimposed Sakawan Nabae
group. From these facts the writer recently proposed the Arakuran age between the Fujinohiran and the Sakawan**. This article treats with two
species of ammonite among the fossils
mentioned above.

Geological Note

The Arakura formation consisting
mostly of shales and sandy shales morethan 70 m thick is distributed in small
patches at Arakura and Kongoin. l\hizuru City, Kyoto Prefecture. It is overlain disconformably by the Sakawan ( ·.
Carnian) Nabae group, and is assumed
to be in fault-contact with the Permian
Maizuru group. The Arakura contains
some marine animal fossils such as'' JUonophy!lites" aralmrensis sp. nov ..
Monoplzyllites ? sp. indet., Halobia ? sp.,
Palaeoneilo sp., Nucu!opsis (Palaeonucu!a?) sp., Lima sp., Psioidea spp. a, fl, Spiriferina sp., gastropods and bryozoans.
As wi II be stated below, "Monop/Tylliles"
amkurensis and M.? sp. suggest the Carnian age of this formation rather than
Ladinian. Furthermore. Psioidea sp. a
is closely related to the Oretian (=lower
Carnian) P. conjuncta HEcToR from New
Zealand. From these fossil evidences

Description of SpecieH

Ammonoidea
Family Monophyllitidae SMITH
Genus .~1onoph)'llites. 1\IoJsJSOVJcs** NAKAZAWA, K. (1958): On the Triassic
Arakura formation and a proposal of the
Arakuran Age. Earth Science (Chik)?l·lwgaku).
No . .16.

* Received Oct. 5. 1957; read at the 67th
Meeting of the Palaeontological Society ofJapan, Sept. 28, 1957, at Kyoto.
217

218

Keiji NAKAZAWA" J1onophyllites " arakurensis
NAKAzAw A,

sp. nov.

Plate 31, Figures la-d, Tcxt·figure I.
Dia~:nosis :-Shell large in size, rather
evolute. Whorls compressed. elliptical.
with a little convex flank and arched
venter. Surface covered by nearlystraight radial striae growing stronger
towards the ventra I and developing
into distinct ribs on the periphery,
where the ribs seem to be projectedbackward.
Suture-line monophyllic.
deeply intended and more subdivided
than in Afonopliyllites s. s ..

Text·fig. 1. Reconstructed suture·lincof " Alonopltylfiles" arakurensis n. sp.

Rcmad?s :-As the specimens at hand
are imperfect and, further. strongly
crushed by later crustal movements,

the specific characters are not fully
known. The partly preserved suture-line
is more developed than in jl,!onoplzyllites
s. s .. and its general aspect is much similar to that of Mojsvarites. especially,
the lower Carnian Jill. eug_vms (ro.'foJslsovlcs) (SPATH, 1934, p. 310, text-fig. lOSa). However. the species under consideration is easily distinguished from thelatter by fairly strongly developed ornaments, inasmuch as Jl1ojs1oarites has anearly smooth shell. In this point the
species is somewhat similar to 1\fmzopliy/fites s. s.. but differs in the stronger
sculptures, especially, on the periphery.
The backward projection of the ribs
reverse to the striation of Monophy/liles
may have been caused by secondary
deformation, and the radials are supposed to be nearly straight on the venteras well as on the flank. This species
undoubtedly belongs to a new genus
in Monophyllitidae, an offshoot fromMonophy//iles-stock, but it is tentatively
placed in Monoplzy/liles, because thesample is too imperfect for establishinga new genus. The advanced sutureline and developed ornament suggest
its age be Nco-Triassic.
Occurrrnce :-From the Arakura formation at Arakura, Maizuru City.

Explanation of Plate 31
Figs. la-d. "Mo11ophyfliles" arakurensis NAKAZAWA n. sp.
la. Holotype (]M. 10456). clay cast of the external mould, lateral view, the Arakura
formation at Arakura, Maizuru City. X 1.
lb. External cast of the outer volution and internal mould of the preceding volution
with suture-lines, the same specimen, lateral view. X 1.
lc. Restored figure of the same specimen. x 1;a.
ld. Excentric cross·section of the same; the shell has been crushed and partly
detached near the venter. X 1.
Figs. 2a-b. ]l,fonop!zy/lites ? sp. indet.
2a. Fragmental external mould (JM. 10457). Loc. ditto. X 1.
2b. Internal mould with a part of suture·line of the same specimen. X 1.
All illustrated specimens are kept in the Geological and Mineralogical Institute, Univer·sity:or Kyoto.

NAKAZAWA:

Plate 31

Monophyllites

A

B/,. - - - ........ ,
/

I

II

"'

A

' \

I

\

f

\

I
I
I
I

lc

1

I
I
I

\

I

"

\

\

I
I

\

I

\

"'

lb

"Monoplly/lites" arakurensis sp. nov. from the Maizuru Zone

Age :-Arakuran (earliest Carnian or
Ladi no-Carnian).
Reg. No. JM. 10456.

MonojJ!ty!lites ? sp. indet.
Plate 31, Figures 2a-b.

A fragmental outer and an innermoulds are in hand. The surface isornamented by slightly sigmoidal
growth striae like Monophyllites s. s.
The suture-line, though very imperfect,shows monophyllic characters. and ishighly intended.
Although the surface striation is219

typically of Mmzophyllites s. s., thestrongly intended lateral lobes may indicate the more intimate re'lation to
the preceding species or Mojsvarites.
The specific comparison is, however,almost impossible because of the imperfect state of preservation.
Occurrence and Age :-ditto.
Reg. No. JM. 10457.
Ueference
L. F. (193·1), Catalogue of the Fossil
Cephalopoda in the British Museum(Natural History), Part 4.
The Ammonoidea of the Trias.

SPATH,

220

PROCEEDINGS OF THE PALAEONTOLOGICAL SOCIETY
OF JAPAN

re*,fJ'4~f6J·1~ 1957 *k~J 195SiJ! 2 J'.l1 e

Jil[:ft:k?f! .'!~··r.l-lll.ttl!TI~'Fri1:~~Y.1X~n;:mt '"l mHm
t.-t.:(~~~·31::V,).

1957if4H 6 B0B;;f;:.ttfl'l';("f:~t®~l~~t '"l*~~ ~lnt0·Y:~ t T;:, L. !::.iJ;J¥;.
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1J'i'zl<:..fitlt-:.

mwm :M;o:~e..mMm8t:tlX0

iiJil)~.tJ;:,o
1. Pseudosclul'lr~eriua milurranoensis,

a newPermian Fusulinids and its Growthand: Form ({~;h~) ............... Sabu ro AKAGr
2. Fusulinids from the Funafuseyama
Limestone: Part 2 ({~,fn;) ... Hisayoshi I Go
3. :ltm.iillffli!Jj/H;,pf.H<DHiffi*UTHL!ll .........

.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. . .. .. .. .. . 7.$100 rr- r';

rPf>=O)i 1 itfE'.~ UIL!:LU: .IC O).t(Hil.B;'!~ ......
................................................ tUf m
5. JJJt.tH~I;b~ld~:.:::'lili'l~l;b0 tfi::O.;'f, WftTili'luf.
c'j~(f~flff~ C;c 0)1) ?1-.l.f!'l:l:UL!:hftE t ;c 0)
lf11.1l"Y.(f~.C.tij.ji ........................ iUf ii'J • t~1k
'1f. • il'6W\Itl'iU • ti!DJ=I it~ • ~ill!!c\!.~1 • ~EBi'.5~• !j' f.6 L~ R • ,,t.!f.ii ~f.=· !1'1li'd t-1i • rf1/ll~x4.

6. Japanese llnlysitidae ... Takashi HAMADA
1. a*()) nm;v;O)~fZ:J!t {t:fi{lflt-:>t '-c ...

............................................... ifi*it~
8. On some Permian Corals from tlw Hida
Massif ( i\:;~;,\) ................. Ilisayoshi !Go
9. =f'!THr;l.:k?t!f'lO) Bryozoa 1::: -:>t 'L ({~;t,'t)................................................ f.lim~=

10. On the Cambrian Gastropods from
Korea ........................ Tei ichi Kos..-\. YAsm
11. Some Ordovician Gastropods from the
Mun'grong or Bunkei District, South
Kore:~ ........................ Teiichi KoBAYASHI
12. The Lower and Middle Cretaceous Tri·gonians from Wakayama, Oita and Ku·
mamoto l'rdectures, West Japan ......
Teiichi KouAYASIII and Mitsuo NAKANO
13. Notes on Some Species of Tertiary
Mollusca from the Joban Coal-field,
japan (1-~:J.J.;} ............ Katsumi HIRAYAMA
14. On the 1\lolluscan Fauna from the Ter·
tiary Formation of Kami-saroma, Kita·
mino-kuni, Hokkaitlo (f~;m\) .............. .

Wataru HASHIMOTO and Saburo KANNO
15. {Jilt1U!XJ:Fllm~J111 Pectinidae; .IC()) 13,
Pecten (Patinopectell) pamplebejus No·
MURA and I-IATAI ...... 1\oichiro MASUT>A

16.

~tQ~Jtlif~iJ'.; 0.)

Palinoj>ecftm inumm·

rai MAsUDA n. sp. It-:>~ '1:' .............. .
................................. Koichiro MAsUDA
17. Orientation of Pelecypodal Fossils(Part 1) ( ft,i;;;) ............................... ..
... Shigeru AoKr and Takaichiro OMORI
18. Some Cambro-Ordovician Fossils fromthe Tan'gyang or Tanya District, South
Korea ....................... .'J'ciichi KonAYASIH
19. A Gotlandian Nautiloid from the llida
Plateau in japan ...... Tei ichi KoBAYASHI
20. A New Find of Devonian Ostracoda
from Fukuji Dist rict. .. Takashi IIA MADA
21 1~1'lfrllt Carcinop/a:r 0t1J~H\'i ......... "")'-~)JiG/t
22. On the Echinoid Fossil from the Naka·
minato Formation (Upper Cretaceous)along the Coast of Nakaminato City,
Ibaraki Prefecture ............ Toshio SAITO
23. A New Miocene Tapirid .................... .
. .. Fuyuji TAKA! and Tadaichi IIAYASHJ
24. A Restudy of the Genus 1'/iysoporel/a({~ltR) ................................. l~iuji ENno
25. On Schizoneura manclmril'1lsis KoNNO
and its Fructification from Tsaichia
Series (Upper Permian) in Penhsihu
Coal-field, N. E. China ......... Enzo KoNNO
26. On the Genus CycadeoidM from Hiroshima-ken, Japan .................. Seido ENtoo
27. A Revision of the Miocene Fern of
Osmuuda tstmeuomoriensis MATsuo from
Fukui Prefecture, Inner-side of Ccn·
tral Japan ................. Ilidekuni MATsuo~ tJIJom lJti¥J~0JL\:t'.t t ~N*IJ'Mrlr.-:>t ''t

ZiJDN!ffi) ........................... :m!Lff iJJ,
a- o ·;/ '"01~11-'~*.IW~tlH<t1trl*m> ......................... /&nUI!tj:X~ 9 lill ;.t -'fliT- :'f ~~:i ~,iN lt 1111,~~ t..(KJnf~}IJ)-r........................... ,J,t.-f;~~

22L

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