354 UNGULATA. 



The dentition of tlie Euminants presents peculiarities almost 

 as great and as distinctive as those to be derived from the di- 

 gestive system. In the typical Euminants {e.g., Oxen, Sheep, 

 Antelopes), there are no incisor teeth in the upper jaw, their 

 place being taken by a callous pad of hardened gum, against 

 which the lower incisors impinge (fig. 640). There are also 



Fig. 64(3. — Skull of a hornless Slieep (after Owen), i. Incisors ; r, Canines ; 

 III, Molars and pra?moIars. 



110 upper canine teeth, and the only teeth in the upper jaw 

 are six molars on each side. In the front of the lower jaw 

 is a continuous and uninterrupted series of eight teeth, of 

 which the central six are incisors, and the two outer ones 

 are regarded by Owen as being canines. Upon tliis \iQ,\N, 

 canine teeth are present in the lower jaw of tlie typical 

 Euminants, and they are only remarkable for being placed 

 in the same series as the incisors, which they altogether re- 

 semble in shape, size, and direction. Behind this continuous 

 series of eight teeth in the lower jaw there is a vacant 

 space, which is followed behind by six grinders on each side. 

 The premolars and molars are of the " selenodont " type, and 

 have their grinding-surfaces marked with two double cres- 

 cents, the convexities of which are turned inwards in the 

 upper, and outwards in the lower teeth. 



