PARAHIPPUS. 



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Characters. — (Matthew, 1913, Oshorn 1918) (1) Distinctions in cranial and dental proportions from type of P. 

 nebrascensis are partly due to crushing of the latter type. (2) A distinct crochet on p 2-3 absent in P. nebrascensis type; 

 (3) anteroposterior diameters of grinding teeth throughout equalling or exceeding those of P. nebrascensis type; (4) trans- 

 verse diameters of grinding teeth, especially of the molars, greater throughout. (5) Orbit farther back, anterior border 

 above middle of m 3 while in P. nebrascensis it is above anterior end of m 3 ; (6) diastema behind canine somewhat shorter. 



Fig. 5(1. The Fore Foot of Parahippus. Anterior and external views of manus in P. pawiviensis atavus 



OSBORN AND P. TYLERI LoOMIS, AND SECTION THROUGH METACARPALS. 



(Left) P. pawniensis atavus, Amer. Mus. 14233, manus of type, a small species, the lateral digits moderately reduced, 

 the fifth metacarpal a very short splint. (Right) P. tyleri Loomis, Amer. Mus. 13769, referred specimen, a large animal, 

 rather heavily proportioned, lateral digits moderate, the fifth metacarpal a small nodule. All figures one-half natural size. 



