HISTORY OF THE ARTIODACTYLA 



371 



odon. Almost complete skeletons of this genus have been 

 obtained in the channel sandstones of the upper White River 

 substage. In size and proportions, \Bothriodon was not 

 unlike a domestic pig, but had a very long head with slender, 

 pointed snout; it had also a short neck, long body, short 

 limbs and feet. The primitive character of this genus is made 

 clear by many features of its structure ; the molar teeth were 

 extremely low-crowned and their cusps were so imperfectly 



Fig. 196. — '^Bothriodon brachyrhynchiis, upper White River stage. Restored from a 

 skeleton in the museum of Princeton University. 



crescentic in form as to be called buno-selenodont, as indicating 

 their transitional nature, and the upper molars had five cusps 

 instead of four, a very primitive feature. Another very sig- 

 nificant character was the five-toed manus ; the first digit, 

 or pollex, was much smaller than the others. 



The second genus of the family which had American rep- 

 resentatives was ^Anthracotherium, which was much like 

 jBothriodon, but even more archaic in character; the molars 

 could hardly be called selenodont at all. 



