TO THE LOWER ANIMALS. 



99 



JSfan, 



Gorilla. 



Cynocepfialus. 



7Il2 



m^ 



X2 



CheiTomy!;. 



Fig. 18. — ^Lateral views, of the same length, of the upper jaws of various 

 Primates. ^, incisors ; c, canines ; pm^ premolars ; m, molars. A line is 

 drawn through the first molar of Man, Gorilla^ CynocepJialus^ and Cebus, and 

 the grinding surface of the second molar is shown in each, its anterior and in- 

 ternal angle being just above the m of m\ 



