7 i8 



PRIMA TES 



At least twenty species have been described (C. fatuellus, C. hmatus, 

 C. capuchins, C. albifrons, C. hypolewus, etc.), but it is probable that 

 some of these are not entitled to stand, since there is a large 



Fig. 343. — The White-cheeked Sapajou (Cebus hmatus). From Proc. Zool. Soc. 1S65, pi. 45. 



amount of individual variation. Fossil remains of species of Cebus 

 have been described from the Pleistocene cavern-deposits of Brazil. 



Family Cercopithecid.e. 



Dentition: i f, c •£, p f, m % ; total 32. Crowns of molars elon- 

 gated antero- posteriorly, with the tubercles forming a pair of 

 imperfect transverse ridges, and the last lower molar usually with 

 a hind talon. A bony external auditory meatus. A narrow inter- 

 narial septum. Tail non-prehensile. Ischiatic callosities present. 

 Cheek-pouches present or absent. Pollex, when present, opposable. 

 Pelvic limbs never much longer than pectoral. Sternum narrow. 

 Crecum without vermiform appendage. 



This family includes all the Old World Apes, with the excep- 

 tion of the Simiidce, and may be divided into the subfamilies Cerco- 

 pithecincB and SemnopUhecince. 



Subfamily Cereopitheeinse. — Pelvic and pectoral limbs approxi- 

 mately equal; tail variable; cheek-pouches present; stomach 

 simple. 





