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MAMMALIA. 
Genus 20.— Sciurus. 
Generic Character. —Incisors no canines, grinders ; to¬ 
tal 22. The upper incisory teeth are flat in front, and wedge- 
shaped at the extremity; the lower pointed and compressed 
laterally; grinders tubercular; head small; ears erect; eyes 
large; body small, elongated; anterior feet with four long toes, 
and a tubercle instead of a thumb ; the hind feet with five long 
toes, ali furnished with long crooked nails ; tail long, frequent¬ 
ly very villose ; two pectoral teats and six ventral. 
* Tail distichous. 
Sciurus vulgaris. — The Common Squirrel. 
Plate XVIII. fig. 11. 
Fur reddish-yellow above, white beneath ; ears erect, pencilled 
with long hairs. 
Sciurus Clarkii. — Clark’s Squirrel. 
Plate XXI. fig. 5. 
Fur silvery-gray above ; shoulders, flanks, and belly, white, 
with an ochry tint; tail flat, terminating in a point. Inhabits 
North America. 
** Tail round, distichous only at the extremity. 
Sciurus cestuans. — The Guerlinguet Squirrel. 
Plate XXIII. fig. 1. 
Fur olive-gray, mixed with red above, pale red underneath; 
tail round, longer than the body. 
*** Having cheek pouches, tail distichous. 
Sciurus striatus. — The Striated Squirrel. 
Plate XXIII. fig. 2. 
Fur light brown above, with five longitudinal brown stripes, 
