SWIMMING ANIMALS
99
rule.
It only emerges by a jumpso far that the front
'
.
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wings are clear of the water and at once expanded. The
tail is then wagged .vigorously to and fro, and thus, by
sculling action“ (for which the ehlargement of the lower lobe
is helpiul) ñncreases the speed till suddenly the sh is drawn
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up into the air and remains in gliding ight with its”…wings ,
at rest and sometimes, for a distance of several
hundred
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FIG. IS,—Showing position of ns “of Flying Fish.
A.
When in full ight and
B.’ before reentering the water, the pelvic ns being depressed to reduce the speed '
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of ight (after Hankin).
_metres,— pres'er‘ves,
_uniforr‘h height above the water; '
Occasionally,‘ especially in cooler weather, slight uttering
of the wings does occur at _starting,îbut
the wings are n‘early '
always at rest during the remainde‘r of the ight
”
(Fig. 18).
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ight is only a few inches above the water surface.
In the sea horse the ns are often reduced to mere vestiges
‘or_ are absent altogether.
The sh _is covered with a
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