MAMMALIA. 
103 
Mus musculus .— The Common Mouse. 
Plate XVIII. fig. 4. 
Fur dusky-gray above, ash-coloured beneath ; body four inches 
long; tail about the same length. A variety is found pure 
white, with red eyes. Inhabits Europe and British Islands. 
Sub-Division II.—American Spineless Rats. 
Mus rufus .— The Red Rat. 
Fur yellowish-red; darker on the head and back; belly yel¬ 
lowish ; tail more than half as long as the body. About six 
six inches long. Inhabits Paraguay. 
Sue-Division III.—Spinous Rats. 
Mus perchal. — The Perchal Rat. 
Plate XIX. 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 
Pondicherry, 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 live toes, 
and strong nails ; tail short and hairy. 
Cricetus vulgaris. — The Common Hamster. 
Plate XIX. fig. 10. 
I ur grayish-fawn colour above, black underneath, with three 
large yellowish spots on each side, and one white spot on the 
throat and another under the chest. Somewhat larger than the 
common rat. Inhabits the northern parts of Europe and Asia. 
