,,
ADAPTATION
,
2479
in the extended
wall of the .endolymph Chamber which is
part of the statocyst.
In this waychanges of pressure or
Vibrations within the air—bladder are communicated directly
'
‘
to the sense—organ;
This apparatus is only
certain freshwater shes, the mostnŒnei‘ousand “ dominant
families of freshwater Teleosts. at the present clay
”' (Bridge),
This wonderful mechanism 'r‘esembles a good deal the
arrangement of the ear ossicles in higher animals and
serves the same purpose, the conveyance of.pfessure waves
—_
-
g_g
FI"
—
_.
.:
*
‘
"
‘a','
"@
715—Small bbnes connecting the airêbladder with the “ear ”
,
in.the Carp. "(From T hilo‘.) . db., air-bladder ;J.,_lever; d.‘, director;
m., medulla.
_
.
to the central organ. The ear ossicles have probably arisen
in;thes‘ame way, but from a differ'entset'of
From
I_Wha‘t forces…of. pull andstress they have developed we do
_
not-know, but they ‘-are in sOme way connected with the -
Superior "pharyngealir‘etractor muscles.
'
'
’—
.
Ï
—
The“‘dungs ?’--î—O£ certain shes have probably no con“:
'
nectio With the air—“bladder; though they…maÿ have .arisen
fr0m "the Same ’ cause—> They *are“f0und lin— those, f0rms
which ‘ have
sac beginning-near the mouth
and have 'a =Short
are
.
'