400 EXTINCT MAMMALIA OF NORTH AMERICA. 



iEquQS fratemus. 



Jlorsc, EquM, Cooper, etc. : Aiu. Jour. Sc. 1881, XX, 370. Hildrcth: Ibid. 183G, XXIX, 146. 



Harlan : Ibid. 1842, XLIII, 143. Couper : Proc. Ac. Nat. Sc. 1842, 189, 216 ; Proc. Geol. 



Sc. Loud. 1843, IV, 33. Lyell : Ibid. 36-39. Owen : Am. Jour. Sc. 1844, XLVI, 323 ; Pr. 



Ac. Nat. 8e. 184G, 93 ; Jour. Ac. Nat. Sc. 1847, 18. Holmes : Pr. Am. As. Adv. Sc. 1850, 



III, 203. 

 Equus caballus, Harlan : Ediub. New Phil. Jour. 1834, XVII, 352 ; Med. Phys. Res. 1835, 2G7 ; 



Trans. Geol. Soc. Penn. 1835, I, 61. 

 Equus curvidem, Leidy : Proc. Ac. Nat. Sc. 1847, 263. Gibbes : Pr. Am. As. Adv. Sc. 1849, II, 



193 ; 1850, III, 66. Pictet : Traite de Paleon. 1853, I, 318, in part. 

 Equus fratemus, Leidy : Proc. Ac. Nat. Sc. 1858, 11 ; Holmes' Post-plio. Fos. S. Carolina, 1860, 



100, PI. XV, Figs. 6, 8, 16-18; XVI, Figs. 23, 27-29; the present work, page 265. 



Remains of a Horse found in association with the former, but undistinguishable 

 anatomically from the corresponding parts of ordinary varieties of the Domestic 

 Horse, have been supposed to indicate a peculiar species, distinguished by the above 

 name. Quaternary. 



Equus excelsus. 



See page 266, PI. XIX, Fig. 39 ; XXI, Fig. 31. 

 Leidy : Proc. Ac. Nat. Sc. 1868, 26. 

 Equus occidentalis, Leidy: Proc. Ac. Nat. Sc. 1865, 94. 



Remains from the Pawnee Loup branch of the Platte or Nebraska River, and from 

 the sands of the Niobrara River, Nebraska. They agree in size with corresponding 

 parts of the ordinary Domestic Horse. Similar remains from California probably 

 belong to the same species. Quaternary. 



Equus pacificus. « 



Leidy : Proc. Acad. Nat. Sc. 1868, 195, 



Indicated by teeth from Martinez, Contra Costa County, California. A large 

 species, with extreme simplicity in the folding of the enamel in the upper molars. 

 Quaternary. 



Equus parvulus. 



Equus, Leidy : Proc. Ac. Nat. Sc. 1868, 195. 



Equus parvulus. Marsh : Am. Jour. Sc. 1868, XLVL 374 ; Au. Mag. Nat. Hist. 1869, III, 95. 



Remains from a tertiary deposit at Antelope Station, Nebraska, 450 miles west of 

 Omaha. Pliocene? 



The remains probably belong to the same species as some of the abundant solipedal 

 fossils of the Niobrara sands, 



Equus conversidens. 



Owen: Pr. Roy. Soc. Loud. 1869, XVII, 267. 



Remains from the newer tertiary deposits of the valley of Mexico. 



