172 



UNGULATA 



ORDER VII 



molar without basal cingulum ; superior molars nearly quadrate, quinque- 



tubercular, with three cusps in the anterior half. Lower jaw very deep 



behind, with rounded angular process. Last inferior molar with talonid. 



Middle Eocene; Eger- ^,-.<c-r-~._ 



kingen. Upper Eocene ; 



Mauremont. C. helveticus 



Pict. Phosphorites of K- 



Quercy and St. Hip- %? 



polyte de Caton. C. 



minor Gerv. 



Acotherulum Gervais. 

 Superior molars quadrate. 



Fig. 230. 



Cehochoerus ruet.imeyeri Stehlin. 

 Middle Eocene Bohnerz, Eger- 

 kingen. Upper cheek teeth, i/j. 

 (After Stehlin.) 



Fig. 231. 



Achaenodon robustus Osborn. Middle Eocene (Bridger beds), Washakie, 

 Wyoming. Skull and lower jaw. i/g. (After Osborn.) 



all cusps close together with small fifth tubercle, 

 and the older Phosphorites, Quercy. 



Choeromorus Pictet {Leptacotheruluin Filhol). 

 tubercular, broader than long. Posterior 

 part of lower jaw with sinuated lower margin. 

 Ancestors of the typical Suidae. Canines and 

 first lower premolars normal. Upper Eocene; 

 Mauremont, C. helveticus Pictet. 



Choeropotamxis Cuvier. Molars usually 



A 



Upper Eocene ; Debruge, 

 Superior -molars *quinque- 



Elotherium crassum Marsh. Oligocene (White River beds), Dakota. Skull, lateral aspect {A), and upper 

 aspect (fi). Vs- (After Marsh. ) 



with four angular main cusps and two or three small intermediate conules. 

 Premolars short, simple. First upper P enlarged, first lower F as canine. 

 Lower canine developed as incisor. Superior canine long, dagger- shaped. 



