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Show 812 APPENDIX C.- MAMMALS. It ferrets out the caches of provisions and skins, and- devours their contents greedily, its enormous strength being such as to enable it to remove almost every weight which may be placed upon the articles concealed. It destroys the trap* set for other animals, and tears to pieces their contents. Indeed, in the Northern United States, this animal is dreaded more than the panther or bear, being invested with fabulous attributes of ferocity and danger. This is, to a much less degree, the case in, the Rocky Mountains ; but everywhere the wolverene is attacked with caution. 6. FIBER ZIBETHICUS, L.- Muskrat. Fiber tibethiciu, Aud. & Bach. Quad. L 108, pL 18. The muskrat abounds over the greater part of the American continent, extending from the Atlantic to the Pacific* Its northern and southern limits are not well ascertained: thpse assigned to it by Audubon and Bachman are lat. 69° to lat. 80°. 7. SPERMOPHILUS 13- LINBATUS, MitchilL Sciurut lZ- lineatus, MitohUTs Hedical Repository for 1,821. Spermophilus hoodi, Sabine. & tridqemtyuatui, And. & Bach- L 224, pi. 89. The little prairie squirrel, so common in Wisconsin, Michigan, and Minnesota, would seem to have a very extensive range, in being found by the expedition on the Platte beyond Fort JJaramie. The specimen is, however, immature, and it is quite possible that further investigation may show this to be a species distinct from the St. Peter's specimen described by Dr. MitchilL 8. Ovis MONTANA, Desm.- Bighorn. Ovis montana. Rich. F. B. A. I. p. 271 ;- And. & Bach. Quad- IL 164, pL 73. The specimen of bighorn, or Rocky Mountain Sheep, brought home by Captain Stansbury, was shot on. Chug- Water. It is the largest individual we tyave ever seen, although itself possibly not of maximum size. It differs somewhat from the description in Audubon and Bachman, in having the posterior line of all the legs yellowish white, this * colour extending to the axilla ip front, and confluent behind with the white of buttocks, scrotum, and |