GLIRES. THE RAT TRIBE. 41 



place of the fifth. Tail covered with minute dusky scales, disposed 

 round it in circular bands, and mixed with a few scattered hairs. 

 The female has twelve teats, of which six are situated on the breast, 

 and six on the belly. W. B. 



Common every where about buildings. 



Mus cauddlongissimd squamatd) corpore setose, griseo, 

 subtusafbido. Mus decumanus. Linn. Syst. Nat. Gmel. 

 i. p. 127. 



Mus caudd efangatd, palmis tetradactylis unguiculo pol- 

 licari, corpore rufo. Mus Norvegicus. Erxleben, Syst. 

 regn. animal, gen. 37, sp. 1, p. 381. 



Mus Silvestris. Brisson, regn. animal, p. 170. 



Mus decumanus. Norway Rat. Brown Rat. Turton, 

 i. p. 80. Kerr, p. 128. 



Mus Norvegicus. Klein, quadr. desp. p. 56. 



Le Surmulot. Buff. Sonn. xxri. p. 27, tab. 3, fig. 1. 

 Cuv. tab. element, p. 139. 



Norway Rat. Shaw's Gen. Zool. ii. p. 51, tab. 130, 

 fig 2. Penn. Brit. Zooi. i. p. 115, n. 26. 



Brown Rat. Penn. quadr. ii. p. 178. Smellie'sBuffon, 

 iv. p. 275, tab. 71, fig. 1. Bing. Anim. Biog. 3d edit. i. 

 p. 437. 



25. THE BLACK RAT. Tail very long and scaly, body 

 blackish above, cinereous below. Mus rattus* Linn. 



This species is considerably smaller than the last. Length, to the 

 origin of the tail about 7 inches; and of the tail 8 inches. Weight 

 from six to ten ounces. Head somewhat elongated ; and nose sharper 

 than that of the last species. Eyes rather large. Ears broad and 

 naked. Fore-feet have each a claw in place of a thumb or interior 

 toe. Tail very small and slender, almost naked of hair, and covered 

 with annular scales. 



Colour of th^e upper parts deep iron grey, bordering on bladk. 



Belly 



