SUBORDER E AMBLYPODA 221 



Family 2, Ooryphodontidae Marsh. 



Skull elongated, with broad obliquely sloping frontals. Dentition complete. 

 Upper molars tvith anterior ridge and two outer cusps joined by a y -shaped ridge 



Fig. 300. 



Coryphodon testis Co^Q. Lower Eocene (Wasatch beds), Wyoming. Skull and lower jaw. i/, 



(After Osborn.) 



Fig. 301. 



Coryphodon elephantopus Cope. Lower 

 Eocene, New Mexico. Skull, palatal as- 

 pect, i/g. (After Cope.) 



Fig. 302. 



Coryphodon hamatus Marsh. Lower 

 Eocene, Wyoming. Outline of skull, upper 

 aspect, with drawing of brain, i/g. (After 

 Marsh.) 



also with one or two unequally developed inner cusps, from, which ridges extend to the 

 outer cusps. Lower molar with tioo y -shaped ridges, the V opening inwardly, and 

 its anterior branch reduced. Premolars simpler than molars. Incisors conical, 

 upper and lower canines pointed and much elongated. Body small in proportion 



