4.91 MAMMALIA. 



total 16. The grinders are furnished with tubercles ; ears ob- 

 long or round, nearly naked ; without cheek pouches ; fore feet 

 with four toes, and a wart in place of a thumb, covered with an 

 obtuse nail ; hind feet with live toes ; nails long, sharp, and in. 

 curved ; tail long, naked, and scaly ; fur smooth, with a few 

 scattered hairs extending beyond the rest, which in some spe 

 cies are spinous. 



Sub-Division I. — Spineless Rats of the Old Continent. 



Mus decumanus. — The Norway Rat. — Plate XV. fig. .3, 

 — Described, vol. II. p. 326. 



Mus pumilio. — The Liniated Mouse. — Plate XV. fig. 3. 

 — Fur ash-coloured brown above, lighter beneath, with four 

 longitudinal black lines on the ridge of the back ; tail nearly 

 naked, of middling length. Little more than two inches long 

 from the nose to the tail. Inhabits the forests on the Slangen 

 River, eastward of the Cape of Good Hope. 



Mus musculus. — The Common Mouse. — Plate XVIII. fig. 

 4- Described, vol. II. p. 331. 



Sub-Division II. — American Spineless Rats. 



Mus rufus The Red Rat. — Fur yellowish-red ; darker on 



the head and back ; belly yellowish ; tail more than half as long 

 as the body. About six inches long. Inhabits Paraguay. 



Sub-Division III. — Spinous Rats. 



Mus perchal. — The Perchal Rat Plate XV*. fig. 9.— 



Fur reddish-brown above, with spiny hairs intermixed ; gray- 

 ish underneath ; tail not quite so long as the body. Body eigh- 

 teen inches long. Inhabits the town and neighbourhood of 

 I'ondicherry, in India. 



Genus 12. — Cricetus. — Lacepede. 



Generic Character. — Incisory teeth |, no canines, grinders ^^ ; 

 total 16. Surface of the grinders with blunt tubercles ; head 

 thick ; ears oval and round ; with cheek pouches ; fore feet with 

 four toes, and a rudimentary thumb ; hind feet with five toes, 

 and strong nails ; tail short and hairy. 



Cricetus vulgaris. — The Common Hamster. — Plate XV*. 

 fig. 10 Described, toI. II. p. 338 



