ANATOMICAL STRUCTUKE OF ANTHROPOID APES. 183 



{Catarrhina) will generally apply : i % c r p ^m ^'. 

 The following is the formula for the milk-teeth : 

 i ^ \ m %. Magitot and Giglioli* have shown 

 that the milk-teeth are cut in the same order as 

 those of man — first, the lower; second, the upper 

 incisor teeth; third, the front pre-molars; fourth, 

 the back pre-molars; fifth, the canine teeth. Ac- 

 cording to the same authors, the permanent teeth are 

 cut in the following order: — first, the first molar 

 teeth ; second, the lower, and then the upper incisor 

 teeth ; third, the pre-molars ; fourth, the canine 

 teeth ; fifth, the second molar teeth ; sixth, the 

 third molar teeth. In the skull of a male gorilla, 

 Giglioli found that the permanent canine teeth were 

 cut almost simultaneously with the third molar 

 teeth, and after the appearance of the second molar 

 teeth. The cutting of the canine teeth appears to 

 be a longer process than that of the other teeth. 



In anthropoids the structure of the permanent 

 teeth varies with the species, and even with the sex. 

 In the gorilla the two upper central incisor teeth are 

 wide, chisel-shaped, and much larger than the pair 

 of lateral incisors. The four lower incisor teeth 

 are of about the size of the upper lateral in- 

 cisors, and, like these, are chisel-shaped, bat not so 

 wide. The powerful upper canine teeth of an aged 

 male are curved in their lower part, both outwards 

 and inwards. Their form is that of a three-sided, 

 cuneiform pyramid. The anterior surface is rounded, 

 and near its inner edge a deep furrow may be ob- 



* BulleUn de la SocUU d'Anthropologie de Paris (1869), pp. 83, 

 113. 



