EnixocEROTiD.!:. 295 



Suborder IV. NASICORNIA. 



Nose rounded, witli one or two liorns, on a central line, 

 formed of agglutinated hair. Upper lip prehensile. Cutting- 

 teeth of upper jaw rudimentary or wanting, of lower jaw un- 

 equal, shelving; outer one elongate, projeeting; central ones 

 cyliiulrical, deciduous. Toes 3 . 3, nearly of same length, 

 radiating, more or less free, all i-eachiug the ground. 

 Nasicomia, Illiger, Prodr. 1811. 



Fam. 4. RHINOCEROTID^. 



Nose simple, with one or two horns on the central line. Upper 

 lip subpreheusile. Toes three or iSve, united into a broad clavate 

 foot, each with a separate broad nail-like hoof. Teeth : — Incisors 

 variable or wanting, C. ^ . ^, P.M. | . f , M. | . |, =28. Molar teeth 

 with distinct roots. 



Rhinocerina, Grai/, Ann. Phil. 1825 ; Cat. Mamm. B. M. p. 186, 



Rliinoceroten, Giehel, Sdugeth. p. 191. 



Ehinoceratidte, Owen, Odont. p. 587 ; Schinz, Syn. Mamm. ii. p. 332, 



1845. 

 Rhinoceratina, Bonap. Prodr. Mast. p. 1 1 ; Gray, Ann. Phil. 1828. 

 Rhinocerosidise, Lesson, N. Tab. R. A. 1858. 

 Rhmocerotidas, Gray, P. Z. S. 1867, p. 1005. 



St/nojysis of the Genera. 



I. The skin divided into .^hield^ by well-marked folds. Skull icith the inter- 



maxillary free, elongate; upper cutting-teeth long; nasal bones produced, 

 conical. Asiatic Rliinocerotes. 



1. llniNOCEROs. Horn single, anterior. Lumbar and neck-folds 



of the skin weU developed. Part of the occipital bone, near 

 the occipital condyle, and the condjdes themselves prominent. 



2. Ceratorhinus. Horns two, one behind the other. Lumbar 



and neck-folds of the skin rudimentaiy. Occipital end of the 

 skull flat. Condyle not prominent. 



II. Skin uniform, not divided into sJiields. Honis two. Skidl — internasal 



cartilaginous ; intermaxillary free, very small; upper cutting-teeth 

 none ; nasal bones broad, rouiuled. African Rbinocerotes. 



3. Hhinaster. Head short, compressed ; upper lip with a cen- 



tral prominence. Skull short beliind ; occiput erect ; nasal 

 bones rounded in front; lower jaw thick in front; grinders 

 small, in arched series. 



4. CERATOTUERira. Hoad elongate, truncated ; upper lip square. 



Skull elongate and produced behind ; occiput erect, produced 

 above ; nasal bones broad, convex, truncated and sharp- 



