OMNIVORA. 



349 



blance to the modern Peccary, as well as to Anthracotherium. 

 The dental formula is— 



. 3—3 1—1 4—4 



% ; c : vrii 



o o 1 1 O Q 



O O i i O O 



m 



42. 



There is thus a prsemolar less in the lower jaw than in 

 the preceding genus. The canines are of small size ; the 

 molars have four principal tubercles, the last lower molar 

 having two additional accessory tubercles ; and the pattern 

 of the premolars is simpler than that of the molars. 



Fig. 643. — A, Grinding surfaces of tlie last two upper molars on the left side of ^wi/waco- 

 therium magnitm— Miocene (after Gervais) ; b, First two upper molars on the left side of 

 Hyopotavius porciniis, viewed from above— Eocene (after Gervais) ; c, Grinding surface of an 

 upper molar of Anoplotherium commune— Eocene (after Owen) ; d, Last three upper molars of 

 Dicliodon aispidatiis, viewed from above — Eocene (after Owen) ; e, Grinding surface of an 

 upper molar of the same ; r, The five last ujiper molars on the left side of Xiplwdon gracih, 

 viewed from above— Eocene (after Gervais); g, The three last left molars of Dichohnne 

 leporinum — Eocene (after Fraas). 



The genus Hyopotamus, of the Eocene and Lower Miocene, 

 is regarded by Kowalewsky as the type of a distinct fam- 

 ily (the Hijo'potamidoi) ; but it undoubtedly possesses close 

 affinities with the genera just noticed. The dentition is 

 complete, and of a generalised selenodont type ; the molars 

 (fig. 643, b) terminating in pyramidal lobes, the summits of 

 which are moderately sharp, and the valleys between which 

 are not filled in with cement. The crowns of the lower 

 molars exhibit double crescents, with an internal tubercle ; 

 and the upper molars possess an accessory fifth lobe. The 



