THE TEETH OF THE HIGHER APES AND MAN 187 



tion, but the Chimpanzee and Gorilla are nearer 

 man in many other respects. 



The upper centrals are of great size, and are 

 twice as wide as the laterals. They have basal 

 ridges on the lingual surface. 



The laterals are pointed, the distal edge being 

 obliquely truncated and the mesial edge rounded 

 so that but a point appears. A diastema as wide 

 as the laterals separates them from the canines. 

 The lower incisors are of nearly equal width, and 

 long and stout. 



The canines in the males are long, strong, and 

 slightly curved without the anterior groove of the 

 Baboons. They are much larger than the other 

 teeth, and imperfectly trihedral, with a trenchant 

 edge behind and a ridge running from the lingual 

 cingulum to the point. These teeth are smaller in 

 the female. They do not appear until after the 

 third molars are in place. The lower canines are 

 sharp-pointed, with a marked lingual ridge. 



The upper premolars are smaller than in the 

 Baboons, the cusps of the first being more pro- 

 nounced than those of the second. The outer 

 cusp is the larger. The lower first premolar has 

 a subacute point with three ridges descending in- 

 ternally. The second is bicuspid in form. 



The first and second true molars above are 

 larger than the third. There are four tubercles, 

 but these are rather reduced. The enamel of the 



