GEOLOGICAL SURVEY OF THE TERRITORIES. 351 



den from the miocene deposit of Bear Creek, a tributary of White Eiver, 

 Dakota. It apparently possessed the same number and arrangement of 

 teeth as the former two genera. 



Protomeryx Halli. — The species, about the size of the domestic sheep, 

 is named in honor of James Hallj the eminent geologist and paleontol- 

 ogist. 



MEGAJLQMERYX. 



This generic name has been appropriated to a large ruminant appa- 

 rently of the camel family. It is founded on a couple of specimens of 

 large, inferior molar teeth obtained by Professor Hayden from the plio- 

 cene sands of the Niobrara Eiver. The genus is probably the same as 

 that to which our living lama and alpaca belong. 



Megalomeryx niobrar.ensis. — The species exceeded in size the existing 

 camel. 



MOSCHIDiE. 



The family to which pertain the musks, or musk-deers at the present 

 period, is chiefly confined to the continent of Asia and the adjacent 

 islands. It was represented during the miocene tertiary period in 

 North America, by an extinct genus to which the following name has 

 been given : 



LEPTOMERTX. 



The genus was first characterized by a mutilated skull, discovered by 

 Dr. John Evans, in the Mauvaises Terres of White Eiver, Dakota. Sub- 

 sequently Professor Hayden obtained portions of several less well-pre- 

 served skulls, together with many fragments of jaws and teeth, partly 

 from the same locality and partly from Bear Creek, a tributary of the 

 Cheyenne Eiver. 



Leptomeryx JEvansi. — The skull indicates an animal about the size of the 

 musk deer of Thibet. The species is named in honor of its discoverer, 

 the late Dr. John Evans. 



cervid^:. 



The deer family, so far as known, is poorly represented in the tertiary 

 and quaternary deposits of the North American continent. However, 

 a larger species of deer than any now living is indicated by remains 

 found in association with those of the American. mastodon. 



CERVTTS. 



The genus was probably in existence in the pliocene fauna of Nebraska. 

 A few remains, attributed to an extinct species, have been found in the 

 sands of the Niobrara Eiver. 



Cervus Warreni. — The species was about the size of the living Virginia 

 deer. It is named in honor of General G. K, Warren, during whose expe- 

 dition its remains were discovered by Professor Hayden. 



ANTILOPID.E. 



The antelope family appears to have been represented in the pliocene 

 fauna of Nebraska, by a peculiar, genus, having furcated horn cores. 



COSORYX. 



The peculiar genus thus named and just alluded to is founded on 

 several fragments of horn cores — they may be of antlers — discovered by 

 Professor Hayden in the sands of the Niobrara Eiver. A species, ap- 



