RHINOCEROTID.E. 159 



There are apparently three digits to each foot, and there is no horn ; 

 the teeth are like those of Rhinoceros. 



Hyracodon nebrascensis, Leidy \ 



Syn. Rhinoceros nebrascensis, Leidy 2 . 

 Aceratherium nebrascense, Leidy 3 . 



This is the type species, and is about the size of Tapirus indicus. 

 Rah. North America. 



29683. Fragment of the left maxilla, containing pm.3 , pm. 4 . a nd 

 portions of mJL and m. 2 ; from the Lower Miocene of the 

 White Eiver, Nebraska, U.S.A. Purchased, 1855. 



44084. Fragment of the mandible with one imperfect cheek-tooth ; 

 from Nebraska. Purchased, 1873. 



29679. The distal extremity of a humerus, perhaps belonging to this 

 species ; from Nebraska. Purchased, 1855. 



The reference of the three following genera to the present family 

 is provisional. 



Genus CADURCOTHERIUM, P. Gervais 4 . 



The complete dental formula is unknown ; the molars are rhino- 

 cerotic, but are extremely narrow in a transverse direction ; the 

 lower molars are imperfectly crescentoid. 



Cadurcotherium cayhixense, P. Gervais*. 

 Hah. France. 



M. 2419. Two specimens of left upper true molars, and two lower 

 (Fig.) molars of opposite sides ; from the Upper Eocene phospho- 

 M. 2420. rites of Caylux (Tarn-et-Garonne), France. These speci- 

 mens (one of which is figured in the accompanying wood- 

 cut) agree with those figured by Gervais in the Zool. et 

 Pal. Generales, ser. 2, pi. ix. (1876). Purchased, 1885 



1 Proc. Ac. Xat. Sci. Philad. vol. v. p. 121 (1850; vol. dated 1852); Rhi- 

 noceros. 



2 Loc. cit. 3 Ibid. vol. v. p. 331 (1$52). 

 * Comptes Rendus, vol. lxxvii. p. 106 (1873) 



6 Loc. cit. Amended from cayluxi 



