319 



jaw is clearly tlic 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 I, molars t, 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. 



Okeodon superbus. 



Leidy : Pr. Ac. Nat. Sc. 1S70, 111. 



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

 and Figs. 7 to 1 1, Plate VII. From the Miocene of Oregon. 



MERYCOCHCERUS. 

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



Merycochcerus rusticus. 



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



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

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

 Sweetwater River, Wyoming. 



AGRIOCHCERUS. 



Agriochcerus 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. 



Agriochcerus latifrons. 



Leidy : Pr. Ac. Nat. Sc. 18G7, 32 ; 1870, G7 ; Ext. Mam. N. America 18G9, 381. 



Noticed from the Miocene of Oregon, page 216. 



Omnivora. 



SuiD^. 



DICOTYLES. 



DiCOTYLES PRISTINUS. 



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



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



the Miocene of Oregon. 



