132 MAMMALIAN DENTITION 



do in Man. A hypoconulid may be present on all the teeth 

 and lies rather toward the lateral side. 



The Orang (Fig. 48), a pure frnit-feeder, shows a dentition 

 more completely adapted to fruit diet than either of the other 

 great Anthropoids. It is a heavier animal than Man though less 

 bulky than the Gorilla. The muzzle is relatively longer than that 

 of the Chimpanzee and in this respect resembles the Gorilla. As 

 in Gorilla also the palate is prolonged backward some distance 



Fig. 48. — Dentition of Orang-outan fPongo pygmaens, Hoppius; 9.88-5). An adult 

 male. Example of a pure frugivorous dentition in an Anthropoid. Note how crena- 

 tions obscure the molar pattern. 



beyond the last molar. In the male the limbs of the dental 

 arch diverge forward in consequence of the large canines. The 

 body of the mandible is very deep owing to the extreme length 

 of the roots of the teeth. The sloping symphysial region and the 

 ' ' ape-shelf ' ' are similar to those of the Gorilla. 



The lower incisors are practically vertical, the uppers oblique. 

 Of the large laterally projecting canines the upper is the 

 longer. Both premolars and molars exhibit very well the 



