MONKEYS. 197 



The catarrhini, or Old- World monkeys, have thirty-two 

 teeth : pf , c|, pf , mf . 



All the American monkeys, excepting the family of 

 small monkeys like the marmosets, have twenty-four 

 molars : p^, mj. The dentition of the small monkeys 

 is like that of the catarrhini. All the American mon- 



FIG. 120. 



MARMOSETS (Hapale jacckua). 



keys have tails, and the tails are usually prehensile ; the 

 hind quarters are covered with hair, there being no 

 ischial callosities ; there is no pouch in the cheeks. 

 Among the principal species are the sapajous, the spider 

 monkeys, the howlers, the capuchins. 



These monkeys inhabit Brazil, Paraguay, Guiana, and 

 a part of Mexico, there being no monkeys in the tem- 

 perate zone. 



17* 



