1901.] EHIIS'OCEEOS LASIOTIS. 157 



In this paper no less than six groups of the family are recognized, 

 distinguished mainly by the characters of the skull, those of the 

 teeth being considered to be of less phylogenetic value. Of these 

 six groups, which are treated by the author as subfamilies, three are 

 still existent, the " Ceratorhinse " (sumatrensis), the " Atelodinse " 

 {simiis and hicornis), and the " EhinocerotinsB " (unicornis and 

 sondaicus), groups which were also recognized by Flower as genera 

 in his paper of 1876. 



Now if there is to be any sort of uniformity in the value of 

 genera as recognized among Mammals, it appears to me impossible 

 to continue to include such essentially different animals in one 

 genus Rhinoceros. Elower came to this conclusion in 1876, 

 although he did not cany it out in his later works ; aud now that 

 Osborn arrives at a like opinion from the palaeontological side, 

 I venture to think the generic groups should be accepted for 

 ordinary use. 



But in so doing it would be advisable to start with the names 

 for them which have technical priority, so that no name-changing 

 may hereafter become necessary. Both Atelodus and Ceratorhinus, 

 used by Plower and Osborn, are antedated by earlier names, as the 

 following synonymy will show : — 



I. Ehinoceeos. 



Type. 

 Rhinoceros, Linn. Syst. Nat. (10) i. p. 56 (1758) . . R. unicornis. 

 Eurhinoceros, Gray, P. Z. S. 1867, p. 1009 R. unicornis. 



One-horned. Occipital plane much slanted forward. Meatus 

 closed in below by the junction of the post-tympanic and post- 

 glenoid processes. Functional incisors present above, and canines 

 below. 



1. Rhinoceros unicornis L. 



2. R. sondaicus Desm. Mamm. ii. p. 399 (1822). 



II. DiOEEOEHINUS. 



Type. 

 Dicerorhinus, Gloger, Naturg. p. 125 (1841) . . D. sumatrensis. 

 Oeratorhinus, Gray, P. Z. S. 1867, p. 1021 .... D. sumatrensis. 



Two-horned. An open groove below the meatus. Incisors and 

 canines as in Rhinoceros. 



1. Dicer orhinus sumatrensis G. Cuv. 

 la. JD. sumatrensis lasiotis Selater. 



III. DiCEEOS. 



Tvpe. 

 JDiceros, Gray, Med. Repos. xv. p. 306 (1821). . D. hicornis. 

 Coelodonta, Bronn, Jahrb. Min. Geol. 1831, p. 51 D. aniiquitatis. 

 Oj)siceros, Gloger, Naturg. p. 125 (1841) .... Z). hicornis. 



