SOUTH DAKOTA SCHOOL OF MINES 159 



Protohippus supremus Leidy. Acad. Nat. Sci., Phila., Jour., 



vol. 7, 1869, p. 328. Nw. Neb. 

 Protohippus pernix (Marsh). Am. Jour. Sci., vol. 7, 1874, 



pp. 252-253. Nw. Neb. 

 Protohippus simus Gidley. Am. Mus. Nat. Hist., Bull., vol. 



22, 1906, pp. 139-140. 

 Neohipparion whitneyi Gidley. Am. Mus. Nat. Hist., Bull., 



vol. 19, 1903, pp. 467-476. So. Dak. 

 Neohipparion occidentale (Leidy). Acad. Nat. Sci., Phila., 



Proc, vol. 8, 1856, p. 59, (Hipparion). So. Dak. 

 Neohipparion dolichops Gidley. Am. Mus. Nat. Hist., Bull., 



vol. 22, 1906, pp. 148-151. So. Dak. 

 Artiodactyla. 



Dicotylidae (Tagassuidae). 



Prosthemnops crassigenis Gidley. Am. Mus. Nat. Hist., 



Bull., vol. 20, 1904, pp. 265-267. So. Dak. 

 Camelidae. 



Procamelus occidentalis Leidy. Acad. Nat. Sci., Phila., 



Proc, 1858, pp. 23-24. Nw. Neb. 

 Procamelus robustus Leidy. Acad. Nat. Sci., Phila., Proc, 



1858, p. 89. Nw. Neb. 

 Cervidae. 



Blastomeryx wellsi Matthew. Am. Mus. Nat. Hist., Bull., 



vol. 20, 1904, pp. 125-126. So. Dak. 

 Blastomeryx marshi Lull. Am. Jour., Sci., vol. 50. 1920, pp. 



125-130. Nw. Neb. 

 Aletomeryx gracilis Lull. Am. Jour. Sci., vol. 50, 1920. pp. 



85-124. Nw. Neb. 



PLIOCENE* 

 Perissodactyla. 

 Equidae. 



Pliohippus lullianus Troxell. Am. Jour. Sci., vol. 24, 1916, 



pp. 335-348. So. Dak. 

 Pliohippus pernix Marsh. Am. Jour. Sci., vol. 7, 1874, pp. 



252-253. Nw. Neb. 

 Pliohippus robustus Marsh. Am. Jour. Sci., vol. 7, 1874, 



p. 253. Nw. Neb. 

 Pliohippus leidyanus Osborn. Am. Mus. Nat. Hist., Mem., 

 vol. 2, pt. 1 (new series), 1918, p. 162. Nw. Neb. 



♦For a faunal list of beds of this age found in Southern Sioux 

 County, Nebraska, see: Matthew, W. D. and Cook, H. J. A Pliocene 

 Fauna from Western Nebraska. Am. Mus. Nat. Hist., Bull., vol. 26, 

 pp. 361-414, 1909. 



