96
,
THEBIOLQGY o1«* FISHES
.
these forms has an elastic or muscular__ co‘at—. In most
forms, hoWevei‘, this coat does not appear to be present, and.
the moving forward of the gut is due apparently to the move—
-
ments of the caudal region. In Atherinat (Fig. 23, 7) and
the -Mugils the gut moves
begin With, and then
later extends itself again, and some other forms show even
.,
_
‘
M‘
'
,
‘
«
_,
4
.;
_
"
.
,
_
,
’
…
>
"
<70 -
,
’
î -\°
:
ï
if
8
'
'
,
; .
formand
With change in gut.
'
2 Sand—cel ;
4'. -.BhamphistomaÎ1belône ; 5.. Gunnel ;
_
_j
‘6.
…
=:
“
,
'
_
greatet changes Ïn many cases also‘tliè gut forms a
,
1
Which remains anteriorly, but the whole may grow“backwards
"
again later, as in the Trichiuroidg, _
.
_
__
, _
;— The
position
? of
gut 'a—nd coil
>
'
accompaying gures.
Will be seen“
:
_
‘
as
the tailæend becomes large—'t —and..the gut- moÿes