1S4 



osborn: _OLIGOCENE, MIOCENE, PLIOCENE EQTJID.E. 



The type and referred specimens were found associated with Protohippus propladdus and Pliohippus (Am. Mus. 9093) 

 from the same locality. The third referred specimen (Am. Mus. 9384), from near Grover, was found in the level of 



Teleoceras m cdicornut us. 



Characters. — Matthew (1913) (1) Size large to medium. (2) Upper molars long-crowned, moderately curved, mesostyle 

 heavy, narrowing slowly toward summit of crown; (3) protocones separate except at base of crown; (4) protocone large, 

 strongly flattened, fossette borders considerably infolded, fossettes contracted; (5) pli caballin strong, (6) metastylid 

 on D2 widely separated from metaconid; (7) metastylid-metaconid column broad, deeply grooved to base of tooth; (8) 

 outer surface of protoconid and metaconid considerably flattened; (9) anterior cingulum a prominent plate on internal 

 and external sides of lower teeth, expanding toward crown; (10) lower incisors large, preorbital region moderately elon- 

 gate. (11) Ulnar shaft greatly reduced, slender, thread-like toward middle, distal half unknown; (12) metapodials long, 

 lateral digits much reduced; (13) a facet on Mts. Ill for mesocuneiform. This character is otherwise unknown in the 

 Hipparion of America and belongs to Pliohippus and the Hipparion of Europe. 



Hipparion lenticulare Cope 1893. 



Plates 32.2, 33.5,0,7. Text Figs. 147, 148 148a. 



Protohippus lenticularis, Cope, Cope, Edw. D. "A Preliminary Report on the Vertebrate Paleontology of the Llano Estacado," 

 Fourth Ann. Rept. Geol. Surv. Texas (1892) 1893, pp. 41-42, PI. xii, figs. 1, 2, 2a. 



H 



ippctnon 



lenticulare 



Fig. 147. (Left) Original figures of the type superior molars of Hipparion lenticulare Cope, Univ. Texas Coll. (cast 

 Amer. Mus. 14390). (1, 2) Crown view in an early stage of wear; (2a) posterior side of the tooth represented in fig. 2. 

 After Cope, 1889, PI. xii, figs. 1, 2, 2a. (5, 6, 7) The same teeth redrawn under the direction of Osborn. (5) Right 

 superior molar of the type, (6) paratype left superior molar, (7) posterior view of the paratype tooth. All figures natural 



size. 



