76 



OSBORN: OLIGOCENE, MIOCENE, PLIOCENE EQUIDiE. 



Parahippus pristinus sp. nov. 



Plate 6.5, 9.7, 25.1, 36.1. Text Fig. 52. 



Horizon and locality. — Lower Rosebud formation of Porcupine Creek, Pine Ridge, South Dakota. Type collected 

 by Amer. Mus. Expedition of 1906. 



1 



Parahippus pristinus 



Fig. 52. Parahippus pristinus Osborn. (Left figures) Amer. Mus. 12918, type. Side view of skull, one-half natural 

 size; crown view of left superior grinding series, natural size. (Right) Hind foot of a referred specimen, Am. Mus. 12923, 

 (a) front and (b) external views with cross section of metatarsals. One-half natural size; partly reversed in drawing. 



Type. — Amer. Mus. 12918. Palate and symphysis mandibuli including all teeth except incisors of left side and the 

 right canine. 



Type fig ure. — Plate 6.5, 9.7, text Fig. 52 of this Memoir. 



Characters. — (Matthew, 1913) (1) Size not exceeding Miohippus intermedins. (2) Grinding teeth somewhat more 



