VERTEBRATA. 343 
long, prehensile tail ;"° the nostrils are placed far apart, 
so that the nose is wide and flat; the thumbs and great 
toes are fitted for grasping, but are not opposable to the 
other digits; and they have four molars more than the 
Apes or Man—that is, thirty-six teeth in all. In the Apes 
of the Old World the tail is never prehensile, and is some- 
times wanting; the nostrils are close together; both thumbs 
and great toes are opposable; and the teeth, though num- 
- bering the same as Man’s, are uneven (the incisors being 
Fic. 342.—White-throated Sapajou (Cebus hypoleucus). Central America, 
prominent, and the canines large), and the series is inter- 
rupted by a gap on one side or other of the canines. 
Their average size is much greater than that of the Le- 
murs or Monkeys, and they are not so strictly arboreal. 
In both Monkeys and Apes, the cerebrum covers the cere- 
bellum.”” While in the Lemurs and Monkeys the skull 
is rounded and smooth, that of the Apes, especially those 
coming nearest to Man—the anthropoid, or long-armed, 
