CETACEANS. 591 
The largest bats are the fruit bats or flying foxes (Ptero- 
pus) of the East Indies; one species of which expands one and 
a half metres (nearly five feet) from 
tip to tip of the wings. Our com- 
monest species is the little brown 
bat, Vespertilio subulatus of Say; 
nearly as common is the red bat, 
Atalapha noveboracensis Coues. 
Order 5. Cete (Cetacea).—We 
now come to the Hducabilia, in 
which the brain is more highly de- 
veloped, and begin with two very 
aberrant orders, the whales and 
Sirenians, in which the body is 
fish-like, though: the tail is hori- 
zontal ; the pelvis and hind limbs 
are wanting, either wholly, or mi- 
nute rudiments may be present ; 
and they are aquatic, occasionally 
leaping ‘out of the water, but usu- 
‘ally only showing the dorsal fin or 
nose when at the surface to breathe. 
The whales and porpoises have 
a large, broad brain, with numer- 
ous and complicated deep convolu- 
tions. 
In the skull (Figs. 512, 513) the 
aperture for the spinal cord (fora- 
men magnum) is entirely posterior 
in situation and directed some- 
what upward. The lower jaw is 
straight, with no ascending ramus, 
the narrow condyles being situated 
at the end of the jaw, at the point 
indicated by the angle of the ramus 
in other mammals. The teeth are 
conical, with a single root, but are 
sometimes wanting. There-is no 
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