THE TEETH OF THE HIGHER APES AND MAN 185 



is often crowded for space on account of the 

 shortening of the jaws. 



(i) The teeth in general are larger, thicker, 

 and coarser in the Apes, are more square and 

 angular, and the cusps and edges are more prom- 

 inent and sharp. In man the teeth are smaller 

 and finer in texture, the crown is narrower and 

 rounder, the angles are reduced, and the cusps 

 and edges are short and blunt. 



Fig. 77.— Teeth of Gibbon. 



The resemblances are also marked in the exact 

 formula and number, but all the resemblances are 

 not found in the Apes. Thus in the little Celebes 

 monkey the teeth are in close contiguity as in man. 

 The oblique ridge of the upper molars is found in 

 the higher Apes, also in some of the American 

 monkeys. In man the canines erupt before the 

 third molars, but in the Apes not until afterward. 



Descriptive. The Gibbons (Fig. 77) are the 

 lowest of the tailless Apes, and are found in the 



