184 COMPAEATIVE DENTAL ANATOMY 



arch is shortened and rounded to form a graceful 

 curve. 



(c) The teeth of the Apes are of irregular 

 height, the canines standing above the level of the 

 rest. In man no one tooth surpasses another in 

 height, but all are on the same level. 



(d) In the Apes there is a diastema in front of 

 the canine above into which the lower canine 

 closes. In man there are no spaces between the 

 teeth, but they are in regular continuity in the 

 series in both jaws. 



(e) The incisors in the Apes incline forward 

 more or less, and by their projection increase the 

 prognathism. In man the incisors in both jaws 

 are vertical, except in some of the low races with 

 distinct prognathism. 



(f ) In the Apes the canines are very large and 

 long, with sharp edges behind like the Carnivora, 

 and are larger in the male than in the female. In 

 man they are reduced to a level with the other 

 teeth, the animal features obliterated, and there 

 are no sexual differences in these teeth. 



(g) In the Apes the molar series increase in 

 size from front to back, and follow a straight line. 

 In man they decrease in size from first to last, 

 and follow a curved line. 



(h) The third molar is the largest of the series 

 in the Apes, and has ample room in the jaw. In 

 man it is the smallest of the molar series, and 



