319 



jaw is clearly the first premolar, as Dr. Gill has stated." As may be 

 seen by referring to pages 84 and 85 of the Extinct Mammalia of Dakota 

 and Nebraska, although giving the formula of dentition of Oreodon as — 

 incisors f, canines t, premolars f, molars f, I observe that the inferior 

 canine is a transformed premolar, and that the inferior lateral incisor, as 

 in other ruminants, is to be regarded as an incisiform canine. 



Ojkeodon superbus. 



Leidy : Pr. Ac. Nat. Sc. 1870, 111. 



Described page 211, and represented by Fig. 1, Plate I ; Fig. 16, Plate II; 

 and Figs. 7 to 11, Plate VII. From the Miocene of Oregon. 



MERYCOCHCERUS. 



Leidy : Pr. Ac. Nat. Sc. 1858, 24; Ext. Mam. N. America 18G9, 380. 



Meeycochceeus eusticus. 



Leidy : Pr. Ac. Nat. Sc. 1870, 109. 



Described page 199, and represented by Figs. 1 to 3, Plate III ; Figs. 1 

 to 5, Plate VII; and Figs. 9 to 11, Plate XX. From the Pliocene of 

 Sweetwater River, Wyoming. 



AGRIOCH(ERUS. 



Ageiochoeeus antiquus. 



Leidy : Pr. Ac. Nat. Sc. 1850, 121 ; Ext. Mam. N. America 1809, 381 ; Pr. Ac. 

 Nat. Sc. 1870, 112. 



Noticed from the Miocene of Oregon, page 216. 



Ageioohceeus latifeons. 



Leidy: Pr. Ac. Nat. Sc. 1807, 32 ; 1S70, G7; Ext. Mam. N. America 1869, 381. 



Noticed from the Miocene of Oregon, page 216. 



Omnivora. 

 SuiDiE. 



DICOTYLES. 



Dicotyles peistinus. 



Peccary. Leidy : Pr. Ac. Nat. Sc. 1870, 112. 



Described page 216, and represented by Figs. 13, 14, Plate VII. From 

 the Miocene of Oregon. 



