RHINOCEROTID^;. 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. 

 Sab. North America. 



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

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

 White River, 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 cayluxense, P. Gervais*. 

 Hob. 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. Generates, ser. 2, pi. ix. (1876). Purchased, 1885 



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

 noceros. 



2 Loc. cit. 3 Ibid vol y> p 331 



4 Comptes Eendus, vol. Ixxvii. p. 106 (1873) 



5 Loc. cit. Amended from cayluxi 



