ORDER UNGULATA. 



331 



larger than a Rabbit, in which the teeth are selenodont ; the ante- 

 rior premolars more or less secant ; the auditory bullae inflated (fig. 

 1206) and the feet furnished with four complete digits. These 

 small animals probably approximated in outward appearance to the 

 living Chevrotains (Tragulus) of the Oriental region. In the typical 

 forms there is no diastema in the dental series j but this is present 

 in other species to which the name Plesiomeryx has been assigned 



Fig. 1206. — CanotJierium Filholi. Upper and lower views of the cranium; 

 from the Upper Eocene of Caylux. 



by some writers. The limb-bones show characters connecting them 

 both with the Suidce and the Ruminants. In the figured cranium 

 the nasals are peculiar for terminating in a point. This genus, of 

 which the names Zooligus and Microtherium are also synonyms, 

 ranges from the Upper Eocene (Lower Oligocene) of Vaucluse to 

 the Lower Miocene (Upper Oligocene) of Allier. An allied genus 

 is Moidllactherium, of the Quercy Phosphorites, in which the third 

 upper true molar has but four columns ; while yet another allied 

 form from the same deposits has received the name Oxacrou. The 

 European Upper Eocene genus Dichobimus (Didymodon) is regarded 

 by Professor Riitimeyer as a bunodont form closely allied to Cce?io- 

 therium ; Dilotherium and Spaniotherium being kindred genera 



