208 UNGT7LATA. 



29681. The nearly complete cranium, showing all the cheek-teeth, 



which are in a well-worn condition ; from the Miocene of 

 the White Eiver. The length of the space occupied by 

 the three true molars is 0,0395, which agrees with that of 

 the small form named by Cope in the Proc. Amer. Phil. 

 Soc. vol. xxi. p. 513 (1884), var. periculorum ; he records 

 that form only from Colorado and Wyoming. 



Purchased, 1855. 



29682. The middle portion of the cranium of an immature indi- 



vidual, showing the third and fourth milk-molars, and 

 the three true molars, in an almost unworn condition ; 

 from the Miocene of the White River. The length of the 

 space occupied by the three true molars is 0,048. 



Purchased, 1855. 



35910. The middle portion of the cranium, showing the hinder 

 cheek-teeth, in a much-worn condition ; from the Miocene 

 of the White River. The length of the space occupied by 

 the three true molars is 0,047. Purchased, 1860. 



29678. Fragment of the right maxilla, containing the three true 

 molars, in an early stage of wear ; from the Miocene of 

 the White River. The length of the space occupied by 

 the three teeth is 0,0425. Purchased, 1855. 



44083. Fragment of the right maxilla of an immature individual, 

 containing the third and fourth milk-, and the first and 

 second true molars, and four fragments of the mandible ; 

 from the Miocene of the White River. Purchased, 1873. 



44000. Fragment of the hinder portion of a cranium, perhaps be- 

 longing to a young individual of the present species ; from 

 the Miocene of the White River. PurcJiased, 1873. 



Genus EPOREODON, Marsh 1 . 

 Syn. Eucrotaphus, Cope 2 (ex Leidy 3 ). 



This genus agrees with Oreodon, with the exception that the 

 auditory bullae are inflated ; and the present writer has strong doubts 

 as to its right to distinction. 



1 Amor. Journ. ser. 3, vol. ix. p.. 249 (1875). 



a Proo. Amer. Phil. Soc. vol. xxi. p. 513 (1884). 



8 Proc. Ac, Nat. Sci. Philad. vol. v. p. 92 (1851). This genus was discarded 

 by Leidy, and as it is a synonym of one species of Agriochaerus, its adoption for 

 the present group seems undesirable. 



