72 THE MAMMALS OF BRITAIN, &C. 



ORDER V. 



Gnawers, — Rodentores. 



Beaver, (Castor. Lin. J 

 Bank Beaver Castor fiber, (Lin.) 



Arvicule, (Arvicula, Lac. J 

 Water Arvicule Arvicola amphibia, (Desm.) 



Field Arvicule Arvicola agrestis, (Flem.) 



Bank Arvicule Arvicola riparia, (Yarr.) 



Dormer,* (Myoxus, Gmel.) 

 Wood Dormer Myoxus avellanarius, (Desm.) 



Mouse, (Mus, Antlq.) 

 Field Mouse Mus silvaticus, (Lin.) 



Harvest Mouse Mus raessorius, (Shaw.) 



Common Mouse Mus domus, ( W.) 



Rat, (Rattus, rn^.; 

 Black Rat Rattus ater, (W.) 



Brown Rat Rattus decumanus, (Pall.) 



Squirrel, (Sciurus, Lin.) 

 Common Squirrel Sciurus vulgaris, (Lin.) 



Hare, (Lepus, (Lin.) 

 Common Hare Lepus timidus, (Lin.) 



Alpine Hare Lepus albus, ( Briss.) 



.Common Rabit, (Cuniculus, W.) 

 Common Rabit Cuniculus varius, ( W.) 



Cavy, (Cavia, Gmel.) 

 Common Cayy Cavia varia, ( W.) 



Several genera are admitted in the foregoing list, which are not 

 generally received : such as the Ass (Asinus) and the Rabbit (Cu- 

 niculus). The laws which govern the construction of genera 

 should, however, be similar throughout Zoology ; and if the Grey 

 Squaterol (Pluvialis cinerea, of Willughby) may be separated from 

 the Golden Plover, (Pluvialis viridis, Will.), surely the Ass may be 

 placed in a separate genus from the Horse. The writer of the 

 excellent article. Ass, in Partington's Cyclopaedia of Natural His- 

 tory , thinks differently ; and the point must be decided after further 

 research. The arrangement of Mammalogy is yet in its infancy, 

 and, indeed, it may be doubted whether any department has kept 

 pace with Ornithology, which, being the most interesting depart- 

 ment of Zoology, has received the most attention and engrossed the 

 largest share of int^est. 



Derbyshire, Feb. 5, 1836. S. D. W. 



• Dormer is derived from dormire, to sleep, as this animal sleeps through 

 the winter.^[U8ually spelt iJormoMse.^ED.] 



