TO THE LOWER ANIMALS. 



99 



Man. 



Gorilla 



Chriromys. 



FIG. 1 8. Lateral views, of the same length, of the upper jaws of various 

 Primates, t, incisors ; <r, canines ; pm, premolars ; m, molars. A line is 

 drawn through the first molar of Man, Gorilla, Cynocephalus, 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 '. 



