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 these 

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



Papre. Name. 



^4. Syniphalangus. 



95. Peromyscus. 



07. Lagiuus. 

 97. Dicrostonyx. 



Type. 



S. syndactylus. 



" Cricetus myoides, 

 Gapper." 



" L. migratorius," = 

 Mvodes lagurus, 

 Pall. 



ICO. Pygeretmns. 



100. Scartiirus. 



] 1 fGamphotherium. 



1 2.5. Dicerorhinus. 

 ] 2-'). Opsiceros. 



P. platyurus. 



" Dipus tetradactylus, 



Liclit." 

 Mastodon ang-ustidens. 



Rhinoceros sumatrensis. 

 Iibinoceios bicornis. 



Remarks. 



Antedates Siamanga, Gray, 1843. 

 Must be adopted if the Siamang is 

 considered generically distinct 

 from the other Gibbous. 



Antedates iSitomyi^, Fitzinger, 1867, 

 which has been recently revived in 

 place of Vesperimiis, Coues, 1874. 

 Must be used for the North- 

 American White-footed Mice*. 



Equals Eremiomijs, Poliakoflf, 1881, 

 which it antedates. 



No type mentioned, but, from the 

 description, the name is clearly 

 given to the Arctic Lemmings, 

 commonly known as Cuniciilux, 

 Wagl. Cvniculus, however, in 

 this sense, though dating from 

 1832, is preoccupied by Brissou, so 

 that Gloger's name must stand for 

 the genus. 



Equals Platycercomys, Brandt, 1844, 

 which it supersedes. 



Equals and supersedes Scirtomys^ 

 Brandt, 1844. 



Species placed in Mastodon by Ly- 

 dekker J ; but as a subgenus Gam- 

 photherivm would antedate both 

 Trilopliodon, Falconer, 18.57, and 

 Tetrabelodon, Cope, 1884. 



Supersedes Ceraturhinns, Gray, 1867. 



Supersedes Atelodus, Pome), ] 853 §. 



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

 in connexion with this paper, has pointed out to me that the name 

 (tniericanus, revived by Coues (Am. Nat. 1879, p. 784), and again by 

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

 looted mouse, from Kari^s Mus ayrariiis 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 ainericcmus, clearly a wholly different 

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

 mouse. The familiar and appropriate name leucopus will therefore again 

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

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

 myscus leucopus by renaming the species P. arboreus. 



+ Fossil. 



X Cat. Foss. Mamm. B. M. iv. p. 28 (1880). 



§ Diceros, Gray, Med. Repos. xv. p. .'506, antedates Opsiceros, but is 

 preoccupied by Lamarck, 1805, and others. 



