ANOPLOTHERIID.E. OREODONTIDJE. 207 



29477. The distal half of a metapodial ; from the Upper Eocene of 

 Montmartre. Hastings Collection. Purchased, 1855. 



M. 1571. The distal half of a metapodial ; from the Upper Eocene 

 of Montmartre. Presented by A. Nesbitt, Esq., 1883. 



181 (0. C.). The distal extremity of a metapodial, with the three 

 associated phalaugeals of one side ; from the Upper Eocene 

 of Montmartre. Presented by Baron Cuvier. 



Family OREODONTID^E. 



Cope 1 considers this family as related to the Anoplotheriidce, but 

 with more completely selenodont teeth, and less specialized feet, 

 which are more like those of the Hippopotamus than of the Rumi- 

 nants. The upper true molars have four columns on their crowns ; 

 the ulna, radius, tibia, fibula, metapodials, navicular, and cuboid are 

 distinct. The family is probably allied both to the Merycopotamidce 

 and the Anoplotheriidce. 



Genus OREODON, Leidy 2 . 

 Syn. Merycoidodon, Leidy 3 . 



Dentition : I. |, C. }, Pm. \, M. |. 



The orbits are complete, the premaxillae separate, the auditory 

 not inflated, and there are no facial vacuities. 



Oreodon culbertsoni, Leidy '. 

 Syn. Merycoidodon culbertsoni, Leidy 5 . 



This species is divided into a larger and a smaller variety : in 

 the former the length of the space occupied by the three upper true 

 molars varies from 0,050 to 0,046, and in the latter from 0,042 to 

 0,040. 



Hob. N. America. 



42828. Cast of the cranium and mandible. The original is from the 

 Miocene of the White River, Dakota, U.S.A. ; and is figured 

 by Leidy in the Journ. Ac. Nat. Sci. Philad. ser. 2, vol. vii. 

 pi. vi. fig. 1. Van Breda Collection. Purchased, 1871. 



1 Proo. Amer. Phil. Soc. vol. xii. p. 503 (1884). 



8 Proc. Ac. Nat. Sci. Philad. vol. v. p. 238 (1851, vol. dated 1852). 



3 Ibid. vol. iv. p. 47 (1848, vol. dated 1850). 



* Loc. cit., Merycoidodon. s Loc. cit. 



