SPECIES OP MAMMALIA. 



ment of a thumb on the fore-feet ; the two middle nails 

 very large, and apparently double or divided ; tail very 

 short. 



Mus Hudsonius, Pallas, Glires, 208. Lemraus Hud- 

 sonius, Desmarest, Mam. sp. 453. 



Hudson's Bay Rat, Pen. Quud. 201. 



Icon. Pallas, I. c. tab. 2b, Jig. A, B, and C. Schreb. 194. 



Inhabits Labrador, Canada. Mus. Brit. 



557. 6. L. Torquatus (Ringed Lemming.) Ferruginous, 

 with a black dorsal line, and a white collar, imperfect un- 

 derneath ; ears very short ; five toes before ; nails moderate, 

 that of the thumb short and rounded. 



Mus Torquatus, Pallas, Glires, 206. Lemmus Torquatus, 

 Desm. Ency. Mam. sp. 454. 



Ringed Rat, Pen. Quad. 201. Le Collier, Vicq. d'Azyr. 

 Syst. des Anim. t. ii. 368. 



Icon. Pallas, I. c. pi. 11, B. Schreb. 194. 



Inhabits the vicinity of the Oby, in Siberia. 



558. 7. L. Terrestris (Land Lemming.) Blackish-gray, 

 slightly variegated with yellow ; paler beneath ; tail black. 



Mus Amphibius Terrestris, Lin. Syst. Nat. 82. Lemmus 

 Terrestris, F. Cuv. 



Icon. F. Cuv. Mam. Lithog. 

 Inhabits Europe. 



EcHiMYS*. Geoif. Incisive teeth § ; canines So> cheek- 

 teeth |i = 20. Head long ; eyes large ; ears shortish ; no 

 cheek-pouches ; four toes, and the vestige of a thumb on the 

 fore-feet, five on those behind ; tail long, and generally scaly; 

 back covered with shortish spines, more or less abundant. 



* This word (Spiny Rats) is equally applicable to a few species of the 

 Rats proper, not included in this subgenus. 

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