Vol. 6] Merriam: Virgin Valley and Thousand Creek. 



213 



Mastodon (Tetrabelodon ?, sp.) 



Camel, compare Camelus americanus Wortman. 



Large suilline form. 



Sphenophalos nevadanus Merriam. 



Ilingoceros alexandrae Merriam. 



Ilingoceros schisoceras, sp. 



A number of species of carnivores and rodents not known 

 from the localities mentioned above were obtained at locality 

 1103, at approximately the same level as these localities and less 

 than two miles away, on the west side of Railroad Ridge. This 

 collection contained the following species : 



Ophidian remains. 



Scapanus ( '?), sp. 



Teplirocyoii , near Tcelloggi, n. sp. 



Mustela furlongi, n. sp. 



Mustelid, indet. 



Aretomys minor Kellogg. 



Citelhis, sp. 



Aplodontia alexandrae Furlong 

 Dipoides, sp. 



Entaptychus minimus Kellogg 

 Peromyscus antiqwus Kellogg. 

 Peromyscus ( '?), sp. 

 Diprionomys parvus Kellojj'g. 

 Diprionomys magnus Kellogg. 



Although this collection contains no species corresponding to 

 those from the four localities mentioned above, it is noted that 

 the forms present represent an entirely different faunal phase. 

 The genera included in the list from locality 1103 are in some 

 cases types known in the Virgin Valley Beds, as Tephrocyon and 

 Aplodontia, while others as Citellus, Aretomys, and Peromyscus 

 have a more recent aspect. Considering that there is no reason 

 for presuming this collection to represent an intimate mixture 

 of specimens derived from more than one formation, this phase 

 of the fauna seems to represent approximately the same stage of 

 evolution as thai in the list from the first four localities men- 

 tioned. 



Other genera not found at the four localities first named are 

 Mylagmdus and Prosthennops( ?), found high up in the series at 

 locality 1098. 



