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. — fBulhriodou brachyrhynchus, 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 fAnthracotheriu7n, which was much like 

 ■fBothriodon, but even more archaic in character; the molars 

 could hardly be called selenodont at all. 



