REGULATION OF FORM AND STRUCTURES 115
towards which the moùth‘is originally bent.
-
It is due- to
the compression and thickening of the Connective tissue
between ”the lateral ethmoid in front and the sphenotic
behind. — This thickening gradually increases and the eyeball is lifted as in a sling and pressed over to theother Side.
In many cases the fror‘1tals have by this
and the one nearest the eye-ball may deVelop only
’
but in Bothus the frontals are strongly ossied lOng before the
eye is compelled to move. ‘ And so poWerful is the force used
in moving the eye,Îthat the frontal in this formis completely
smashed and disintegratèS. The other frontal, however,
maintains its position; and the result is, that the migrating*
eye can nd noperranentSoclæt andcontinues to wander
backward9ab0ve-the skull ”throughout the life of the sh. - '
,
The clOse
betWeen the growing asymmetry
—
of the body and the deformation of the Skull ”can be judged
from what happens to the opening musclesl of the mouth.
In ”the rst stage, before the lower jaw is bent upwards;
these muscles are quite normal.' When/che
j‘aW
-
ossies and closes,themuscles from the pectoral arch cannot
_
Open it,
give way; ”just as in the ÏÏPipe—
,
'
shes
part iOf’—the opening muscles breaks
,
away
and graduàlly forms fa
Curve
7).
this curve
-
_
the t0r1i muscle Cells
cartilage—fanda nèw
bone, found nowhere else butin Flat—shes, is formed; : The
Ï
,.
,
result of this operation canbe seen'in the adults; When
We pull On the lower endof the curved bone (urohyal) it
'
rotates and helps the interoperculum to begin the opening
_
ofthe 'mOuth, then the upperpar‘t completes the process.
Manÿfother Changes occur in theregionbf the head—; the
‘
“arches —arejiall incliried to the side, the muscles are
,
tdm” Ëaway
their connections» and the eyeèmuscles,ca
symmetrÏi‘Cal ‘ ; _-to=1 begin .— With,” nd new ‘
: The
'
imp0rtantiftlng‘fis,?that "the
;has» once mére
,
triumphed
that
; .”
-
‘
These
at; ana ‘ _no; jidoùbt the
.
’
ness of
to