Peterson : Miocene Beds of Nebraska and Wyoming. 69 



most of the lumbar vertebrae. The specimen (No. 1590) was found 

 in 1901, in the Upper Harrison beds on the Niobrara (Running 

 Water) River, in Sioux County, Nebraska. 



Though the general appearance of the specimen is cat-like, many 

 characters indicate that it should not be included in the Felinae and 

 that it should be placed in the Mustelinae. The general appearance 

 of the dentition is strikingly similar to that in Gulo luscus Linnaeus 

 and the Cape ratel. The heavy lateral incisor, the large size and 

 crowded position of the premolars, the short heel of the inferior 

 carnassial, and the broad internal border of M T are perhaps the most 

 marked characters common to the genera Gulo and sElurocyon. 



Mellivorodon palozindicus Lydekker is smaller in size than ALluro- 

 cyon. The Indian fossil also lacks P T . Premolars T , -3, and ¥ are 

 relatively smaller and the carnassial is larger antero-posteriorly. Mel- 

 livorodon palceindicus also is without the posterior basal accessory cusp 

 on P- 



FiG. 17. JElurocyon bi-evifacies Peterson. View of right side of skull, \ nat. 

 size. Type, No. 1590. 



Principal Characters. 



l\X, C\, Pf, Mf. The cranium is high; the face is short and 

 cat-like ; the inferior border of the lower jaw is evenly rounded from 

 before backward ; the temporal fossa of the lower jaw is deep and of 



