Orotherium yasacciense. Cope. 



Lophiotherium vasacciense, Cope. Proceed. Am. Philos. Soc, 1872, 

 July 11th (extras). Notharctus vasaeeiensis, Cope, 1. c, 1872, 474. 



This species is similar to the last in most respects, the corresponding 

 molars differing in the more elevated yoke between the tubercles of op- 

 posite sides, and the presence of a posterior median tubercle. 



From Green River beds near Evanston, and the same near Black Buttes, 

 Wyoming, on opposite sides of the Bridger Basin. 



TOMITHERIUM ROSTRATUS. Cope. 



Proceed Amer. Philos. Soc, 1872, August 11th, p. 470. 



This genus differs from Orotherium, among other points, in the simple 

 second premolar, which is without posterior cusp. It appears to be 

 nearly allied to the Thinolestes of Marsh, and was published on the same 

 day. That genus was, however, not distinguished by Marsh from 

 Notharctus and Limnotherium, so as to be recognizable. The species 

 differs from all those described by the same author, so far as I can 

 discover. 



NOTHARCTUS LONGICATJDTJS. Cope. 



Pantolestes loiigicaudus, Cope. Proceed. Amer. Philos. Soc, 1872, p. 

 467 (August 3d). 



I originally assigned but 3 P. M., to this species, but now find that it 

 possesses four, and must be referred to Notharctus. It differs from all 

 the species described by Marsh, in having the second premolar two- 

 rooted, and from Leidy's two species in its slender proportions. 



Triacodon acttleatus. Cope. 



Proceed. Amer. Philos. Soc, 1872, p. 460, July 29th. 



The measurements of this species are somewhat larger than those 

 given by Marsh, for his T. grandis (Amer. Journ. Sci. Arts, August 13, 

 1872) ; but the species may prove to be the same. The allied genus Sty- 

 polophus, Cope, is no doubt marsupial. 



VlVERRAVUS PARVIVORTJS. Cope. 



Miacis parvivorus, Cope. Proceed. Amer. Philos. Soc, 1872, 470, 

 (August 7th). 



This species appears to belong to the genus Viverravus of Marsh, which 

 bears date July 22, 1872, consequently sixteen days earlier than Miacis, 

 which thus becomes a synonym. The species is different from those 

 described by that author. 



Paramys leptodus. Cope, sp. nov. 

 Established on a right mandibular ramus with all the teeth pre- 

 served. It indicates an animal of about the size of the P. delicatus, 

 Leidy, and P. robustus, Marsh, but with smaller incisors, which have 

 little more than half the diameter of the same tooth in those species. 

 The molars have two anterior separate, and three posterior contiguous 



