PRIMATES. 



335 



The tail is sometimes used as a prehensile organ. The fingers and toes 

 have arched or flat nails. The thumb is sometimes reduced, and is 

 never opposable to the same extent as the great toe. Cheek pouches 

 and ischial callosities always absent. 



Fam. Pithecidae. Apes with long hairy tail, which cannot be used for prehen- 

 sion ; Pithecia Satanas Hoffms., Brazil; NyctipitJiecus trivirgatus v. Humb., New 

 Granada ; CJirysothrix sciurea L., Saimir, Squirrel Monkey, Guiana ; Callithrix 

 personata Geoff r., east coast of Brazil. 



fi.v.lMLMEUU. WISH. 

 PIG. 706. Gorilla engena, from Vogt and Specht. 



Fam. Cebidae. Apes with prehensile tail covered with hair or naked at the 

 end. Cebus capucinus L., Sai, Capuchin ; Ateles paniscus L., Koaita, Spider- 

 monkey, Brazil ; A. Belzebuth Geoffr., Guiana ; Lagotlirix Hwnuoldtii Geoff 

 Peru. Mycetes 111., Howling Monkeys. M. niger Geoffr, Brazil ; M. seniculus L.' 



Suborder 3. Catarrhini. Apes of the Old World, with narrow 

 nasal septum, and approximated, downwardly directed nostrils., with 



(Fig. 705). The tail is never pre- 



thirty-two teeth ^ j- | 



