618 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



LIST OF SPECIES FOUND AT ANITA. 

 EQUIDAE. 



Equus occidentalism Equus giganteus? 



TAGASSUIDAE. 



Mylohyus? Species indeterminatable. 



CAMELIDAE. 



Procamelus coconinensis, new species. Procamelus longurio, new 

 species. 



SCIURIDAE. 



Antilocapra americana? 



Marmota arizonae, new species. Citellus tuitus, new species. 



CRICETIDAE. 



Neotoma cinerea. 



LEPORIDAE. 



Lepus benjamini, new species. Brachylagus browni, new species. 



MUSTELIDAE. 



Taxidea robusta, new species. 



CANIDAE. 



Canis nubilus? Canis latransf 



HYAENIDAE. 



Chasrnaporihetes ossifragus, new genus, new species. 



Family EQUIDAE. 



An examination of the bones belonging to the genus Equus shows 

 that two species are represented — one of medium size, one very large. 

 The former is referred to Equus occidentalis, the latter provisionally 

 to Equus giganteus. 



EQUUS OCCIDENTALIS Leidy. 



Plate 118, fig. 11; plate 124, fig. 1. 



To this species are referred the proximal end of a left third meta- 

 carpal bone (Cat. No. 10131); an upper second premolar (Cat. No. 

 10132); an upper right third molar (Cat. No. 10133), and some 

 fragments of other upper teeth; a lower hindermost molar (Cat. No. 

 10134); some fragments of other upper and lower teeth (Cat. No. 

 10135); and an incisor (Cat. No. 10136). The fragment of meta- 

 carpal is only 65 mm. long. This bone and the others here con- 

 sidered are compared with those of a skeleton of a horse in the 

 National Museum (Cat. No. 174960). In this recent horse the side- 

 to-side diameter of the upper end of the metacarpal is 55 mm.; in 

 the fossil bone this diameter is 50 mm. The facet for the cuboid bone 

 is considerably smaller in the fossil bone than in that of the recent 

 horse. 



