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 st 

 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. ^Dinohyiis 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 

 {^Boochwrus) though somewhat smaller than 

 those of ^Dinohyus, 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 (^ArchoBothe- 

 rium ingens) from 

 lower White River 

 beds. Princeton 

 University Mu- 

 seum. 



Fig. 193. — Skull of White River fentelodont (^ArchcBotherium moHoni). Princeton 

 University Museiun. For restoration, see Fig. 137, p. 260. 



