356 
COMPARATIVE ZOOLOGY. 
stead of a nail. The cerebrum is relatively small, and 
flattened, and does not cover the cerebellum and olfactory 
lobes. 182 They are found 
mainly in Madagascar. 
13. Primates , the head 
of the kingdom, are char¬ 
acterized by the posses¬ 
sion of two hands and 
two feet. The thigh is 
free from the body, and 
all the digits are fur¬ 
nished with nails,the first 
Pig. 351.—Lemur (L. ruber). Madagascar. on the foot enlarged to a 
“great toe.” Throughout the order, the hand is eminently 
or wholly prehensile, and the foot, however prehensile it 
may be, is always locomotive. 193 The clavicles are perfect. 
The eyes are situated in a complete bony cavity, and 
look forward. There are two sets of teeth, all enamelled ; 
and the incisors number four in each jaw. They are 
divided into Monkeys and Apes, and Man. 
The Monkeys of tropical America have, generally,, a 
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 sometimes wanting; the nostrils are close together; 
both thumbs and great toes are opposable; and the teeth, 
though numbering the same as Man’s, are uneven (the 
incisors being prominent, and the canines large), and the 
series is interrupted by a gap on one side or other of 
the canines. Their average size is much greater than 
that of the Monkeys, and they are not so strictly arboreal. 
In both Monkeys and Apes, the cerebrum covers the cere- 
