201 



Genus RHINOCEROS. 



Rhinoceros, Linnaeus Syst. Nat., 12th ed., i, p. 104 (1766). 

 Ceratorhinus, Gray P.Z.S., p. 1021 (1867). Type R. sumatrensis. 



Key of the Indian Species. 



a. With one horn only, skull with the post-tympanic and post-glen- 

 oid processes of the squamosal bone united for a consider- 

 able extent below the meatus auditorius. 

 h. Upper lip rounded off; the posterior neck-fold does not 

 unite with the anterior one to form a saddle; skull with 

 the vomer anchylosed to the skull, and with basi-sphenoid 

 and basi-occipital bones wide and flattened. 



R. unicornis, p 202. 



3^. Upper lip produced into a short proboscis; the posterior 

 neck-fold unites with the anterior one to form a saddle 

 on the neck; skull with the vomer ending freely posteri- 

 orly in a jagged point frequently broken off ; the basi- 

 sphenoid and basi-occipital very much narrowed and 

 steep at the sides ; an ossified mesethmofd present. 



R. sondaicus, p. 202. 



«^. With two horns, skull with the post-tympanic and post-glenoid 

 processes of the squamosal separated so as to form an open 

 groove. 

 c. Ears hairy inside ; no long fringe of hairs along the ear - 

 conch ; skull narrow and tooth row short. 



R. sumatrensis, p. 204. 



c^. Ears not hairy inside, a long fringe of hairs along the 

 edge of the ear conch ; skull broader and with a 

 longer tooth row. R, lasiotis, p. 204. 



