162 



UNGULATA 



ORDER Vir 



Marsh) (Figs. 218, 219), derived from Falaeosyops; Allops (Diploconus) Marsh, 

 Symborodon Cope, and Brontotherium (Titanops) Marsh. 



Fio. 210. 



Megacerops (lirjiitops) dispar Marsh sp. 01igoc«ne, Dakota. Skull in superior and lateral aspects, i/s- 



(After Marsh.) 



Protitanotherinm Hatcher. Known by the lower jaw of a gigantic form. 

 Upper Eocene (Uinta beds) ; Utah. 



B 



Fio. 220. 



Tltanotherinm iiTOuti Leidy. Oligocene, Dakota. A, Last upper premolar. 

 B, Second upper luolar. 2/^. 



Toula has described, as Menodus rumelicus, some Titanotherioid teetli from 

 Rumelia, the geological age of which is not vet known. 



