118
‘
THE .BIOLOGY OF FISHES
=
—ethmoid by the jaws .being the immediate cause of this
Ï_‘j
transit.
As in Bothus the right eye often fails to obtain a
;
xed orbit, and one case is recorded (Garman, 1899) of the
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eye failing to get through and remainin g inthe head. When
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t(
the violent—convulsion causing these changés is over, the
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Blenny-like sh is turned into a at—sh ; the pectoral girdle
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_"
returns once more to its original position far forward, and
With the release of the pressure on the mOuth the ethmoid
_
_ÿ_Ï
straightens out and in the adult looks as if nothing had
happened to it there (Fig. 30, 4). _'
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The climaX of these extraordina‘ry transformations is
f
reached perhaps by the Seles. These are very like the
.
Symphurus forms just described, but the mouth becomes
deformed on the other side and it isthe left.eye that is made
1
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g
“
to moVe._: Correlated With this We nd that the air—bladder
lies
right instead of the left side.
HOW this
exceptionalÿ'posnion has arisen is not yet clear, but the
.
"resulti$,that
is doubly ill—balanced ; the Coil
' :
of the gut
on the left, the air—bladder lifting it
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f
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on the right“ It is not Surprising, therefore, that the Soles
turn ‘oVer oi" complete their metamorphosis more rapidly,
that is at alsmaller size, than is the Case in any other group j
of Flat-shes
' _ . with ”one exception, the ThickbaCk_ or
.—
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_
Variegated Sole '(S.çrzariegaia), Which reaches .doublethe
size of the others" before Changing,f'and th1s_haS {novfair—
‘
bladder.
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'«
_
Pleattognath&+Aî third Xmplffths…plt
,
.
transformation of : form and structure is jgitæ?’ by the
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,
[
'PleCtoghatS,ÿ._as 1epresentatweofWhlchwe may take
-—Raniania',fÊthe LongeïSun—sh,thedevelopment of which
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wasrecentlydescnbedhy]ohsSchm1dt_ Thé tin—y larva
-
aboutzmmmlengthls:jœt ,mæ, an ordinary larva ?: -'
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]
X, 5)'—. Before the latter is
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"When the mouth forms,
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:
thé ‘-1atter"'into the yolk,Which has a
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much'less pressure “Within it. The result is,
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j— ,
the ;1arva' swells up and
_
ments ‘
are-prevented. ”The larva becomes a passive "body
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