HISTORY OF THE ARTIODACTYLA 



367 



suborder in which digital reduction had pro- 

 ceeded so far, though the existing peccaries 

 approximate this condition. There were, 

 however, nodular vestiges of two other digits, 

 which prove the derivation of this form from /r 

 at least a four-toed type ; no cannon-bone 

 was formed. In view of the size of the 

 animal, the hoofs were surprisingly small, 

 which suggests that the weight was chiefly 

 borne upon a pad. \Dinohyus was a very 

 large animal, six feet or more in height at the 

 shoulder. 



In the upper Oligocene were very large 

 species of another, but closely similar, genus 

 ('fBoochoerus) though somewhat smaller than 

 those of fDinohyus, and the species of the 

 upper White River beds (f ArchcEotherium) 

 were little, if at all, smaller than those of the 

 John Day. A number of specimens in the 

 museum of Princeton University throw a wel- 

 come light upon the habits of these strange 

 creatures. In one, the external, or third, 

 upper incisor tooth has a deep, triangular notch worn in its 



Fig. 192. — Right 

 manus of tentelo- 

 dont {\ Archwothe- 

 rium ingens) from 

 lower White River 

 beds. Princeton 

 University Mu- 

 seum. 



Fig. 193. — Skull of White River fentelodont {tArchceotherium mortoni). Princeton 

 University Museum. For restoratioji, see Fig. 137, p. 260. 



