Pliohippus, Stereohippus, Parahipparion, Pseudohipparion, Neohipparion. 639 
6714. -j- simplicidens. Cope (4931, Equus)-, Gidley, 
Bull. Am. Mus., 1901, p. 123. 
6715. f gracilis. Marsh, Am. Journ. Sc., 1892, 
43, p. 347. 
6716. f robustus. Marsh — (4836). 
67 17. f spectans, Cope — (4893)- Matthew, 
Bull. Amer. Mus., 1899, p. 70, 75. 
6718. f interpolatum. Cope — (48.94); Matthew, 
1. c., 1899, p. 75. 
fPliocaen. Texas. 
f Pliocaen. Oregon. 
f Miocaen. Nebraska. 
f Mioc. et Pliocaen. 
infer. Oregon, Texas, 
f Pliocaen. Texas. 
1226. f Stereohippus, Axnegh., 1904. 
Ameghino, Anal. Mus. B.-Aires, 1904, p. 36. 
6719. f tarijensis, Amegh., 1. c., 1904, p. 36, fPliocaen. Med. 
f. 16, 351, 375-377. Argentina. 
1227. f Parahipparion, Amegh., 1904. 
Ameghino, Anal. Mus. B.-Aires, 1904, p. 273. 
6720. f meridionale. Ameghino, 1. c., 1904, p. 273, fPliocaen. infer, 
f. 373, 374. Argentina. 
1228. f Pseudohipparion, Amegh., 1904. 
Hipparion, p., Cope et Auct. 
Ameghino, Anal. Mus. B.-Aires, 1904, p. 262. 
6721. f retrusum. Cope — (4907)-, Amegh., 1. c., f Miocaen. Sup. 
1904, p. 262, f. 353, 356. Kansas. 
1229. f Neohipparion, Gidley, 1903. 
Hipparion, p., Auct. (Species Americanae); Anchitherium, Donglass, 1900. 
Gidley, Bull. Amer. Mus., 1903, p. 466, 467. 
A. Neohipparion. 
6722. f occidentale. Leidy — (4898, exci, syn.: 
Cope, 1889). 
6723. f affine, Leidy — (4898 part.)- Pavlow, 
Bull. Nat. Moscou, 1888, pl. 1, f. 26. 
occidentalis, Cope, 1889 (4898 p.), 
nec Leidy. 
6724. f whitneyi, Gidley, Bull. Am. Mus., 1903, 
p. 467. 
f Miocaen. Super. 
Dakota, Texas, 
f Miocaen. Super. 
Nebraska, Texas. 
f Miocaen. Super. 
Dakota Merid. 
