3 1 8 Bulletin American Museum of Natural History. [Vol. XVI, 



of the skeleton of a sloth allied to but distinct from Mylodon 

 harlani. Description is reserved for the present. 



Equus complicatus Leidy. This, the first-described and 

 most characteristic of American fossil horses, is by far the 

 most abundant fossil at the Hay Springs locality. Numerous 

 bones of all parts of the skeleton were obtained. 



Equus fraternus. Smaller and not nearly as abundant as 

 E. complicatus. 



Equus ? scotti Gidley. Upper and lower jaws. 



Elephas primigenius columbi. Tusk, several foot-bones, 

 and grinders. 



Platygonus vetus Leidy. Palate. 



Platygonus compressus Leconte. Upper and lower jaws. 



Undescribed Porcine, cf. ? Leptochoerus. Upper premolar 

 (obtained in digging a well near Hay Springs). 



Camelops kansanus Leidy. Parts of jaws, teeth, vertebrae, 

 limb- and foot-bones. More than one species is quite probably 

 represented, but the material does not warrant attempt at 

 separation. 



Camelops vitakerianus Leidy. Teeth, jaw fragments, etc. 



Camelus americanus Wortman. Lower jaw. 



Antilocapra, cf. americana. Parts of jaws, limb- and foot- 

 bones. 



Capromeryx furcifer, n. g. et sp. 



A small jaw containing pg-mg indicates an animal allied to 

 Antilocapra and somewhat more nearly to Merycodns, but 

 generically distinct from either. The premolars are most 

 nearly like those of Merycodns; p^ is long, trenchant, simple, 

 lacking the deuteroconid ; pg and especially Pg are more com- 

 plicated. In Antilocapra p^ is shorter, with prominent deu- 

 teroconid, and the anterior premolars are short and simple, 

 thus approaching the premolar characters of goats and sheep. 

 The molars in Capromeryx are fully as hypsodont as in Antilo- 

 capra, much more so than in Merycodns, which more nearly 

 approach the brachydont teeth of the deer. 



The species was of about two-thirds the (lineal) dimensions 

 of the American antelope. 



