1S2 



OSBORN: OLIGOCENE, MIOCENE, PLIOCENE EQUIDiE. 



Hipparion dolichops Gidley, 190G. 

 Text Fig. 145. 



Neohipparion dolichops sp. nov., Matthew, W. D. and Gidley, J. W. "New or Little Known Mammals from the Miocene of South 

 Dakota," Bull. Amer. Mus. Nat. Hist., Vol. XXII, Art. VIII, May 26, 1906, pp. 148-149, fig. 14. 



Horizon and locality. — Big Spring Canon, headwaters of the Little White River, South Dakota, "Nebraska forma- 

 tion," Lower Pliocene. Type collected by J. W. Gidley of the American expedition of 1903. 



Type. — Amer. Mus. 10S65. A portion of the right maxillary containing the molariform cheek teeth from p 2 -m 2 

 inclusive. Measurements: (Gidley, 1907). 



Measurements of Type (Amer. Mus. 10865) 



Diameters of p 2 , anteropost 030 transv 022 



" p 3 , " 023 " 0235 



" p 1 , " 0235 " 023 + 



" m 1 , " 020 " 022 



" m 2 , " 020 " 0215 



Fig. 145. Hipparion dolichops Gidley, Am. Mus. 10865. (A) Original figure of the type, p 2 -m 2 , fig. 14, p. 149. (B, 

 C) Side and crown view of m 2 of a paratype, Am. Mus. 10832, figs. 15, p. 149. (D, E) Side and palatal views of the left 

 lower jaw of the same paratype, Am. Mus. 10832, figs. 16, 17, pp. 150, 151. A, D, E One-half natural size. B, C Natural 

 size. After Gidley, 1906. 



