29 



first upper premolar, it leaves a considerable diastema between 

 this and the second premolar. 



The mandible approximates in form that of the tapir; the 

 lower border is less curved (ore and aft, the alveolar border 

 is slightly concave antero-posteriorly. The molars converge 

 in fi'ont, presenting a very different arrangement from that in 

 Siis. The ramus is heavy, contracting in depth forward, and 

 very slightly in section. Below the alveolus, on the interior 

 side, the ramus is greatly swollen for two thirds of its depth, 

 to accommodate the ver}- long and strong molar fangs. 



The rami converge to the second premolar, where they 

 ex})and laterally to the canine alveolus. The symphysis is 

 shorter relatively than in /'. paliidosiis, and the chin is regularly 

 rounded in front. The mental foramen is below the second 

 premolar. The dental foramen is small, very high up, and far 

 behind the molars. The alveolar border ascends rapidly be- 

 hind the last molar, expanding laterally into two ridges. 



The coronoid is slender and recurved. The condyle is 

 broad, flat behind, inclines forward internally ; there is 

 scarcely any depression between the condyle and the coro- 

 noid. The masseteric fossa is very wide and deep. The 

 angle of the ramus is broken, but evidently has no such 

 posterior extension as in P. paliidosiis. It thins out rapidly 

 behind. 



Measurtnnents. 



UPPER JAW. 



Length of entire molar series 



Length of three true molars 



Length of three premolars 



Diameter of last molar, transverse 



Diameter of last molar, antero-posterior. . . . 



Diameter of second molar, transverse 



Diameter of second molar, antero-posterior 



Length of incisor series 



Fore-and-aft diameter of canine at base.. . . 



Length of crown of canine 



Diastema between canines and incisors. . . . 

 Diastema between canines and molars 



P. pal. I P. major. 



