TO THE LOWER ANIMALS 



267 



number of teeth as Man and the Gorilla ; but, notwithstand- 

 ing this, their dentition is very different, for they have four 



Man. 



Ckeircmys. 



FIG. 17. 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, Cynocephalus, 

 and Cebus, and the grinding surface of the second molar is shown in 

 each, its anterior and internal angle being just above the m of ma. 



more false molars, like the other American monkeys but as 

 they have four fewer true molars, the total remains the same. 



