‘
.
254
THE BIOLOGY OF FISHES
’
'
_—
,
simlär‘_Wheèlsç but “not for the purpose of
EX—’
tended— on the one side, “as in beding, each vertebra
has a
'
;,
-
,
certai‘ärount of free—play or side-slip, but on the com—
,
préSsed‘side the looking is rigid. Flexibility and rigiditY
…
_
.
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_
,
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FIG. 62.——Sword—sh
àladiùs) with long snout ancl
'
:
î,ï
tafil._ '(Fr0m New Y0rk Zoological
Bulletin, after
Liuseum Naturgl_History.)
_
'_
_
’—
tiine Combine to make a powe;ful shaft andscrew adapted _totr‘eëipt0cal movements."
;
—
,—
*
Wemaÿ call this,apparâüläa‘n àdaptation— to rapid move- — '
ment, but we cannot fail to see that it has arisen from the
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