318 



MERYCODUS 



Merycodus necatus. 



Leidy : Pr. Ac. Nat. So. 1854, 90, 157 ; 1857, 89 ; 1858, 23 ; 1870, 109 ; Ext. Mam. 

 N. America 1809, 382. 



Noticed from the Pliocene of Sweetwater River, Wyoming. Originally 

 described from Bijou Hill and from Little White River, or the South 

 Fork of White Earth River, Dakota. 



Bovid,e. 



BISON. 

 Bison latifrons. 



Leidy : Pr. Ac. Nat. Sc. 1852, 117 ; Mem. Ext. Sp. American Ox in Smiths. Con- 

 trib. 1852, 8; Ext. Mam. N. America 18G9, 371. 



Noticed from the Quaternary of California and Pennsylvania, page 253, and 

 represented in Figs. 4 to 8, Plate XXVIII. 



Found in the Quaternary of Pennsylvania, Georgia, South Carolina, Ken- 

 tucky, Mississippi, Texas, and California. 



OREODONTIDyE. 



OREODON. 



Leidy : Pr. Ac. Nat. Sc. 1851, 238. 

 Merycoidodon. Leidy : Pr. Ac. Nat. Sc. 1848, 47. 



Oreodon Culbertsoni. 



Leidy :.Owens's Eep. Geol. Snr. 1852, 548; Ext. Mam. N. America 1869, 379; 

 Pr. Ac. Nat. Sc. 1870, 67, 112. 



Noticed from John Day's River, Oregon, page 211, and represented in 

 Fig. 12, Plate VII. 



Professor Marsh has recently described some remains from the Miocene of 

 Oregon, under the name of Oreodon occidentaUs. (Am. Jour. Sc. May, 

 1873.) He observes that it resembles O. Culbertsoni in most of its 

 cranial characters, but differs materially in the large auditory bullae. 

 From this, I suspect the remains, together with those I have described 

 from Oregon under the last-mentioned name, belong to the species I 

 have elsewhere named O. bullatus. 



Professor Marsh observes that, "in comparing the various species of Oreo- 

 don, some new points in the structure of the genus were observed." He 

 then gives in the formula of dentition the number of incisors as f , canines 

 t, premolars i, molars t, and adds: "The caniniform tooth of the lower 



