192 



Mr. 0. Thomas's Analysis of 



tenable, owing to their being preoccupied in other groups. But 

 the following cannot be dismissed so easily, as they represent 

 the first names for proposed new groups, and, whether the?;e 

 are valid or not, must be more closely considered : — 



Page. Name. 



34. Symphalarigus. 



05. Peromyscus. 



97. Lagurus. 

 97. Uiovostonyx, 



Type. 

 S. syndactylus. 



" Cricetus myoides, 

 Gapper." 



" L. migratorius," = 

 Myodes lagurus, 

 Pall. 



1C6. Pjgeretmus. 



lOG. Scartiu-us. 



11 tGamphotlieriuni. 



1:25. Dicerorhinus. 

 12-"). Opsiceros, 



P. platyurus. 



" Dipiis tetradactylus, 



Liclit.'" 

 Mastodon auffustidens. 



Khinoceros sumatrensis. 

 Rhinoceros bicornis. 



Remarks. 



Antedates Siamanga, Gray, 1843. 

 Must be adopted if the Siamang is 

 considered genericaUy distinct 

 from the other Gibbous. 



Antedates ISitomys, Fitzinger, 1867, 

 which has been recently revived in 

 place of Vesperimus, Coues, 1874. 

 Must be used for the North- 

 American White-footed Mice *. 



Equals Eremiomt/s, Poliakoff, 1881, 

 which it antedates. 



No type mentioned, but, from the 

 description, the name is clearly 

 given to the Arctic Lemmings, 

 commonly known as Cunioihis, 

 Wagl. Ciinictdus, however, in 

 this sense, though dating from 

 1832, is preoccupied by Brisson, so 

 that Gloger's name must stand for 

 the genus. 



Equals Flatycercomys, Brandt, 1844, 

 which it supersedes. 



Equals and supersedes Scirtomys, 

 Brandt, 1844. 



Species placed in Mastodon by Ly- 

 dekker J ; but as a subgenus Gam- 

 photherimn would antedate both 

 Trihphodon, Falconer, 1857, and 

 Tetrabelodo7i, Cope, 1884. 



Supersedes Ceraturhinns, Gray, 1867. 



Supersedes Atelodus, Pomel, 1853 §. 



* Mr. Gerrit S. Miller, to Avhom I am indebted for much assistance 

 in connexion with this paper, has pointed out to me that the i.ame 

 americamis, revived bv Coues (Am. Nat. 1879, p. 784), and again bv 

 Allen (Bull. Am. Mus' N. H. iii. p. 294, 1891), for the common white- 

 looted mouse, from Ken's 3Ins agrarhis americanus, 1792, is quite un- 

 tenable, as Kerr himself, four pages before in the same work (Linn. An. 

 K. p. 227), has described a Mus americamis, clearly a wholly different 

 animal, so that the name is effectually barred for the white-footed 

 mouse. The familiar and appropriate name leucoints will therefore again 

 deserve adoption, combined with, as shown above, the generic name of 

 Peroviysms. Gloger at the same time adds another synonym to Pero- 

 ntyscus leucopus by renaming the species P. arboreus. 



+ Fossil. 



X Cat. Foss. Mamm. B. M. iv. p. 28 (1886). 



§ Diceros, Gray, Med. Repos. xv. p. 306, antedates Opsiceros, but i$ 

 preoccupied by Lamarck, 1805, and others. 



