.
DRIFTING LIFE
Ir9
modications of the “
foot,” that solid uninteresting mass
on
which most shellsh creep (Fig. 23).
These animals
are also so numerous in some parts of the ocean that their
empty
form deposits on the sea oor, the Pteropod
'
Oozé (see page 56). -
It is a characteristic of nearly all the plankton animals
that live in the upper layers of the sea, that they are almost
transparent.
If one looks at a tow—net catch that has been
-
;g' ;
-.
=-.' l.'
.
:*î.
:
“..
,
’='ü
'
L" ‘ ; un
,
î
i :
.
_
.
,._
FIG. 24.
-
FIG. 25‘.
'
Sagittà (x z).
Tomopteris (x z).
_
placed in a glass jar full of sea water, it is at rst very hardxto
.
see the—various animals on account_of their transparency. A
Very common creature in the Catch is the “ arrow worm,"
0rSagitta (Fig. 24) ; this is thought
to be 3. relative of
.
the true worms, like the rag—worm, although it is very
'
unlike them in appearance.
It 100ks just like a little glass
rod about three—quarters of an inch in length ;“ but for all
'
its apparent delicacy it isa very
Sur-