THE ARTIODACTYL UNGULATES 205 



first and second incisors is lost early. The molars are selenodont 

 but not markedly hypsodont. Each is quadricuspid. In the 

 upper molars the three primary cusps and the hypocone are 

 all present ; in the loAvers the paraconid is unrepresented but 

 the other four cusps of the primitive tuberculo-sectorial tooth 



Fig. 73. — Dentition of Camel (Camelus sp., 9.7355-1). Here are seen reduction of 

 the upper incisor series, commencing hypsodonty of the cheek teeth, narrowing of the 

 mandible and elongation of the last lower molar which occur in more pronounced 

 form in Deer and Oxen. 



exist. The obliquity of setting of the upper molars in the jaw 

 so that the antero-lateral corner of the one projects beyond the 

 postero-lateral corner of the tooth in front is a feature shared 

 in common with the Pecora and characteristic of the ruminant 



