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Show 50 ZOOLOGY OF TilE VOYAGE OF THE BEAGLE. a deep gray at the base, black at the apex, and narrowly annulated with deep yellow near the apex ; on the throat and belly they are of a paler gray at the base, and grayish white at the apex. The cars are well clothed with brown hairs both within and without, and are for the most part hidden by the long fur of the head. The hairs covering the upper side of the feet are of a palish ashy-brown colour, and the fleshy portion appears to have been brown. The tail is well clothed with hairs, so that the scales are scarcely visible ; on the upper side of the tail the hairs are brownish-black, and on the under side, they are dirty white. The incisors are vet·y slender; those of the upper jaw are of a very pale yellow colour, and those of the lower are white, or nearly so. The muzzle is slender, and pointed. ln . Lines. ln. Lines. Length from nose to root of tail of t11il Length of tarsus (claws included) of e(l.r 11 0 3 from nose to base of ears Habitat, Chonos Archipelago, (December.) This mouse is considerably larger than Mus M~tsc?.tlus, and the great length and density of its fur, causes it to appear much stouter in its proportions ; its colouring is darker, the tips of the hairs being much more narrowly annulated with yellow than in that species. The very small size of the ears will serve to distinguish the present animal from its congeners-ll.fus longipilis, M. Rengger·i, M. a1·enicola, &c. The molar teeth of the uppet· jaw are figured in Plate 34.. fig. 8, a; and fig. 8, b, represents the middle and last molars of the lower jaw. " Inhabited a very small island, covered with thick forest, in the central part of the Chonos Archipelago."-D . . A mouse obtained on the islets adjoining the cast coast of Chiloe (where Mr. Darwin says it was common) differs from the above in being a little smaller, the tail is rathe•· longer, and the ears are a trifle lat·ger. In the feet, claws, colouring and character of the fur it agrees, and likewise in the pale colour and slenderness of the incisors. Its uimensions are as follows :-- Length from nose to root of tail Clf tail o£ tarsus (claws included) ln. Lines. • • oj, 0 . 3 0 . 0 10 Length from noso to car of c11r ln . Lines. 10 ~ 0 I have not the means of satisfying myself whether this be a distinct species or not; but I think it is not. |