REGULATIONÏOF
STRUCTURES î13
is alWays to the left side5 ”chaton WhiChth€ coil of the gut_is
formed;
If an air—bladder
if goes naturally With
the coil to the left side (with a notable eirCeptioh,’ to be
mentioned below) andthùs serves to coùtefbalañc'e theiçoil
in the rst Stage. _Later,.*as. the abdominal;lorg_ansgse£e
down to a better balance among themselV€8,thealt—bladder ' ’
,
becomes too great a
andthepœt—larvaxs
bent over to
side, f
”then passes alongthis side to the=ïnoùfb and skullm‘-tlïè
same Way aS'before, and the upper
the skull is deecœd
5
to‘thelefts1delnthisway We=obigain
;
‘
their eyes on ther1gh’andleftside
Ï '; ::Ï ' !
,
_
; A
thingf'ijs that
‘two‘kinds —
,
may occur
have no
‘
_'
they begin With a
to the leffSide ;
'
_
parts retain the‘imprint of=this 'èa'rlÿdéèctîon.
,
-'
Thenthebody swingsover to the right side andgthe upper _
‘
partoftheskull is
asin the turbot .(Rhor‘nbuS):
Flou—rider usually inclinesç overf_to "Ît—hè . '
-
fleft side, but about 30 per
over Ç
.
to athe.=right s1deAperfecy symmeticäïbiiñdéiä;has r
evenbeenfeundandmanyeXamplesof1mperfect asym
metryabnormahüeshavebeenrecordedThese 111118
Î
,
tratehowunstablethebanœmustbemthes&f0rms
-
andwendal@thattheabdonunalorgansarearranged
in various ways,apparenytocounteractthegrowmg
asymmetry.
i
"
f
_f j;f Thedetermiing inuence On the'coùfse of the growing
f
asymmetry in these forms is the large abdominal
which
'
behind the terminal portion of the f gut
solongasns remains vertical and leaVes the organsifrèe
,
»
'
of the
,
,
'takeplace,eventhoughthe initial stageshave}begùnzAnd {
€ai‘ang'0idë1ähôÿÿthæstage ;;Ï
(Fig22)Butwhenthe
‘
»
enclose”theabdomrnalorgans,
'
'
'
This rod growstotheoneSldeandmtheabnormalforms
-
;