266
,
THE SEAS
‘
to the surface (Fig. 55).
In this way can be found the
actual depth at which the different kinds of organisms live.
But besides the plankton organisms caught by the tow
net, there are many forms so minute that they pass through
the mêshes of the nest Silk obtainable. Their presence
in the sea was rst shown by an examination of the stomach
contents of those small planktonic tunicates, the Oikopleura,
MESSENGER
.
,
.
_
.
A_
_
,
_
,
'
_RæA5xœç
APEARATU5.
B;
'_
…
Ef'._
.
_.
.:
,
f«'_:
:..
.
\\
_
_
…
“——,_wegqur.
.
_
,
.
.
-
‘.
Frs. '55.-=—A closin‘g tow-nét; A, shing ;, B, closed.
'
Wh056h0uses and shing
on page
_.
Many fQImS,
discovered there
had never
been seen
0Ï=the t_OW net patches, so that a
new method had…”îQ be devised to obtain them in sufcient
ÊO throw-light 011 their distribution and irriportance…
Ifc Wasaïouæd that.—this could—, be done if a.samp1e of water
W3ŸS
asrngtH:poin—ted tube.
Samples of water