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. 

 Sab. North America. 



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

 portions of m. 1 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, F. 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. Pbilad. vol. v. p. 121 (1850 ; vol. dated 1852) ; Rhi- 

 noceros. 



2 Loc. cit. 3 Ibid. vol. v. p. 331 (1852). 



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



5 Loc. cit. Amended from cayluxi 



