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THE PRIMATES — EXCEPT MAN 129 



Of the large Anthropoids the Orang-outan of Borneo and 

 Sumatra feeds entirely upon the durian, a fruit which possesses 

 a very tough rind whereas the Gorilla and the Chimpanzee of 

 tropical Africa still have an omnivorous diet consisting of ber- 

 ries, fruit, roots, small mammals, birds and eggs. It will there- 

 fore be simpler to consider the African Anthropoids first. 



The Gorilla (Fig. 46) is an animal heavier and bulkier than 

 Man and possesses long jaws which give it a superficial resem- 



Fig. 46. — Dentition of Gorilla (Gorilla gorilla, Wyman; 9.88-14). This is a nearly 

 adult female. Note the clear-cut "crystalline" cusps on the molars. The third molar is 

 not yet fully erupted. 



blance to the Baboon. The female is much smaller than the 

 male. The elongation of the muzzle and the large size of the 

 canines cause the limbs of the dental arches to be divergent 

 backwards in the male ; they remain approximately parallel in 

 the female. The body of the mandible, though stout, is rela- 

 tively less deep than in Man. The symphysis! region which 

 may be almost vertical in the female slopes downward and 



