so 



OSBORN: OLIGOCENE, MIOCENE, PLIOCENE EQUIDjE. 



Type. — Amer. Mus. 14233. Occiput of skull with a considerable part of the skeleton, in excellent preservation, 

 C 1, 4-7, dorsals, fore and hind limbs. Measurements: height of occiput .006; length of humerus .144; length of radius 

 .174; Mtc. Ill .138; length of femur .207. 



Type figure. — Plates 38, 39.9,13, text Fig. 56 of this Memoir. 



Characters. — (Matthew, 1913, Osborn 1918) (1) Size of the type of Parahippus pawniensis. (2) Pes slender, lateral 

 digits relatively unreduced; (3) Mts. Ill somewhat smaller than in the type of P. pawniensis, with smaller cuboid fossette; 

 (4) lateral digits as in P. pawniensis; (5) limbs moderately long; (6) ulna slender, separate throughout; (7) manus moder- 

 ately long, lateral digits not greatly reduced; (8) Mtc. V a small splint; (9) phalanges longer relatively than in Miohippus; 

 (10) ungual phalanges narrow; (11) Mts. Ill articulation with cuboid oblique, broader and better defined than in Mio- 

 hippus. (12) Occiput high and narrow; (13) condylar facets extended over basioccipital; (14) occipital surface separate 

 and distinct. 



Fig. 55. Original figures of skull and dentition of type of Parahippus nebrascensis Peterson, Carnegie Mus. 1440. 

 (1) Superior incisors and grinders, two-thirds natural size; (2) skidl a little over one-third natural size; (3) lower incisors 

 and grinders, about two-thirds natural size. After Peterson, 1907, PI. xix. 



Parahippus nebrascensis primus subsp. nov. 

 Plates 6.6,7, 8.2, 9.9. Text Fig. 57. 



Horizon and locality. — Upper Harrison formation, upper Niobrara River, western Nebraska. Merycochoerus zone. 

 Type collected by T. F. Olcott, 1907. 



Type. — Amer. Mus. 13770. Skull and jaws. Measurements: total length occiput to incisors .390; condyles to 

 incisors .363; superior dentition .221; superior premolar series, .077; superior molar series .064. 



Type figure. — Plates 6.6,7, 8.2, 9.9, text Fig. 57 of this Memoir. 



