Iron County register. [volume] (Ironton, Iron County, Mo.) 1867-1965, 1915-09-30

the slime pores and canals are greatly developed
and must exude large quantities of slime? Then
too, on deep-sea expeditions, on favorable occa-
sions, as for instance, a dark calm night, fishes
that have been brought to the surface and placed
in water were seen to. flash light from the ends
of the teptacles or the phosphorescent pores,
precisely as we should have expected from a
study of these organs. Major Alcock, In his
interesting volume, "A Naturalist In Indian
Seas mentions a specimen brought up from a
profound depth which "glimmered like a ghost
as it lay dead at the bottom of the pail of tur-
bid seawater." So that by inference, as well as
by actual observation, we must believe that what
we call luminous organs in deep-sea fishes, emit
light into the darkness about them. In the case
of fishes totally blind, the absence of light is
compensated for by the development of enor-
nous antennaelike feelers, modified from fin
rays, so that these fishes can feel their way,
as 1t were, through the darkness.
The absence of light, however, entails another
important consequence. AS is well known, no
plant life can exist in darkness. There is there
fore no vegetation of any kind in the profound
depths of the sea. The deep-sea fishes are, In
consequence, all carnivorous, the more powerful
ones seizing and de~vouring the weaker ones. 1t
is a cold black world where might reigns SUI
preme. Many have enormous mouths, and for
midable teeth to insure holding the prey. In
some forms the teeth are SO large that the mouth
cannot be shut!
The temperature of the water in the profound
depths Of the sea, is always low and near the
freezing point. This Is true everywhere, even
at the equator. Undoubtedly this has an effect
upon the fishes, although it is not yet known
what it is. The amount of oxygen dissolved In
the water also, is much less than in water nearer
the surface. The breathing apparatus OF the
deep-sea fishes is modified to suit their peculiar
conditions. The gill flaments have become much
reduced in size, and in a number of instances
some of the gill arches bear no gill filaments at
all. The fishes are apparently adapted to a
much smaller oxygen supply than those living
in rivers or in the shallow sea.
When we think OF the vast diversity among
these fishes, the question arises: Are they all
representatives of a single family or group that
has become specially adapted to life in the deep
sea; or do they belong to different families or
groups? One need hardly be an ichthyologist
to answer this question. Even a cursory exam
ination Of the plates in a work on deep-sea
fishes will show that different types are repre-
sented. In fact, a great many families are in
cluded in the deep-sea fauna. There are sharks
and rays; salmonoids, behring's, perches. cells
and representatives of many other families. Ne
can explain this heterogeneity among them In
this way. We may imagine that fishes Of many
different kinds in their search, 80 to speak, fol
the unoccupied corners of the sea, found a haver
in these deeper waters where they were free
from pursuit by their enemies. In the course o
time they migrated farther and farther into thu
deep. a change in habits taking place pari passl
with the changes in structure. Having starte'
out with different organizations, and POSSESSING
different degrees of variability, they became dill
ferentiated in diverse directions, SO that Will
some developed enormous mouths, powerful
teeth, or phosphorescent organs, others becam
bottom.living and partly or completely lost thei
eyes. Still others developed long feelers 70
cropping their way through the darkness. No
and again, however, fishes of separate group
developed similar structures, SO that there ar
many striking cases among deep-sea fishes
what the biologist calls Conveyance" or para
lelism.
The museum has recently prepared for exh
bition a number of typical ~deep-sea fishes a
ranged in the form of a group The %preparatic
of this exhibit involved many technical dihict
ties, such as the modelling of the fishes in tran
parent or translucent media, to represent the
as glimmering or shining With lit-up portfolios
Considerable experimenting was necessary