198 



osborn: OLIGOCENE, MIOCENE, PLIOCENE EQUID.E. 



Hipparion peninsulatum Cope 1885. 

 Text Fig. 163. 



Hippotherium peninsulatum, sp. now, Cope, Edw. D. "Pliocene Horses of Southwestern Texas," Amer. Naturalist, Vol. XIX, 

 No. 12, Dec. 1885, pp. 1208-1209, no description, PI. xxxvii, fig. 5. "Report on the Coal Deposits near Lacualtipan, in the State of 

 Hidalgo," Proc. Amer. Philos. Soc. Vol. XXIII, 1886 (sig. dated Dec. 2, 1885), p. 150, fig. 1. 



Horizon and locality. — (Cope, 1885, p. 150) From the Loup Fork shales of Tehuichila, Vera Cruz, Mex. Name of 

 collector not given. 



Fig. 162. Hipparion montczuma Leidy, U. S. Nat. Mus. 3304, right p 3 or p 4 . (Left) Original figure of the type, after 

 Leidy, 1883, p. 291. (Three right-hand figures) Type tooth redrawn under the direction of Osborn by S. Oka; crown 

 external, and anterior views. All figures natural size. 



Fig. 163. Type of Hipparion peninsulatum Cope, Amer. Mus. Cope Coll. 8345, a right superior molar, ?m 2 . (Left) 

 Original figure of the type, after Cope, 1885, fig. 5. (Three right-hand figures) Type tooth redrawn under the direction 

 of Osborn by S. Oka; crown, external, anterior views. Original figure is viewed in line of the axis of the tooth, the new 

 figure at right angle to the grinding surface; hence the difference in proportion. All figures natural size. 



Type. — Amer. Mus. Cope Coll. 8345. (Cope, Gidley) A right superior molar, ?m 2 . Measurements: (Gidley, 1907) 

 m 2 a.p. .0175, tr. .015, height of crown, outside .0515, inside .040. 

 Type figure. — Text Fig. 163 of this Memoir. 



Characters. — (Cope, 1885, p. 150) (1) The type an animal of small size. (2) Crown of superior molar long, curved; 

 (3) grinding face with anteroposterior diameter considerably exceeding transverse; (4) protocone large and narrow antero- 



