MAMMALS, 



615 



able peculiarity is that when the great canine teeth are 

 fully developed, immense protuberances of bone are formed 

 on each cheek, which are deeply furrowed longitudinally, 

 and the naked skin over thorn is brilliantly colored, as just 

 described. (Fig- 69.) In the adult females and in the 

 young of both sexes these protuberances are scarcely per- 



FijET. 69. Head of male Mandrill (from Gervais, " Hist. Nat. des Mammiferes "). 



ceptible; and the naked parts are much less bright colored, 

 the face being almost black, tinged with blue. In the 

 adult female, however, the nose at certain regular intervals 

 of time becomes tinted with red. 



In all the cases hitherto given the male is more strongly 

 or brighter colored than the female, and differs from the 



