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THE NATUEAL HISTOET OF 



division of the true Guenons, comprising the genera 

 Cercopithecus and Cercocebus of GeofFroy. The man- 

 ners are very nearly similar; but the graduation ol 

 the facial angle, the large cheek-pouches, and shorter 

 tail of the latter, seem to lead gradually to the baboons. 

 The system of dentition also allies them by the length 

 of the canine teeth ; and the annexed cut may be com- 

 pared with those illustrating the preceding genus Sem- 

 nopithecus. 



Guenons. 



We shall first notice Cercopithecus. In form it is 

 very closely allied to the last ; but differs from both it 

 and the following by the large facial angle of from 50" 

 to 55, rounded heads, flat noses, and long posterior 

 extremities. The manners are also similar ; but the 



