252 Lloyd's natural history 



over the front of the neck, and sending [in some genera] pro- 

 cesses into the axillce. " or arm-pits. {Huxley^ 



The main brain (or cerebrum) covers the cerebellum in all 

 the members of the CercopithecidcR ; and in them the principal 

 convolutions and fissures found in the human brain are more 

 or less developed. 



The family Cercopithecidce. includes all the Old World 

 Monkeys except the Anthropoid or true Apes, and Man, 

 these latter constituting the two remaining famiHes of the 

 Afithropoidea^ namely SimiidcB and HomiiiidcB. The Cerco- 

 pithecidce have been again divided into two Sub-families, the 

 Cercopithecince and the Se?nnopithecincB. The first contains the 

 Baboons (Cynocephalus), the Gelada Baboons {Theropithecus\ 

 the Mangabeys {Cercocebus) and the Guenons {Cercopithecus)^ 

 all of which inhabit the African continent ; and likewise the 

 Black Apes (Cynopithecus) from Celebes, and the Macaques 

 {Macacus)^ which are almost exclusively confined to the Asiatic 

 continent. In the second Sub-family are included the Nosed- 

 Monkeys {Nasaiis) of Borneo ; the Langurs {Semnopithecus) 

 of India, Malaizia, and the Sunda Islands ; and the Guerezas 

 ( Colobus) of Africa. 



THE BABOONS, MANGABEYS, AND MACAQUES. 

 SUB-FAMILY CERCOPITHECIN^. 



This Sub-family is characterised by the presence, in all its 

 members, of cheek-pouches, and a simple stomach. The tail 

 is variable in length, being long or externally invisible. The 

 callosities on the ischiatic bones are large ; in many species 

 they become very turgescent at certain seasons, the enlarge- 

 ment extending sometimes to the tail. The hues of the skin 

 on and round the face also become more vivid periodically. 



