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Show 1\IAMMALIA. ,')3 mouse (Mus Musculus), its colour is much darker. In possessing a glossy fur it differs from most of its congeners; its head is also proportionately larger, and the incisors are much stronger. The molars of the upper jaw are figured in plate 34, fig. 9, a,-and fig. 9, b, represents those of the under jaw. " Very abundant in gardens and hedges, far from houses; and was easily caught in traps baited either with cheese or meat."--D. 16. Mus XANTHORHINUS. PLATE XVII.-Fig. 1. Mus xanthorhinus, Wate1·1t., Proceedings of tho Zoological Society of London, for January 1837, p. 17. J.lf. supra fuscus fiavo lavatus ; subtus albus ; 'l'ltinw·io fiavo ; aurilms parvulis, intzis piiis jlavis obsitis; mystacibus long is, canis, ad basin nigrescentibus : cauda corpore ln·evim·e, suprafuscd, ad laterafiavescente, subtth sordide alba: pcdibus anticis, tarsisque fiavis, digilis albis: vellere longo, molli. DESCRIPTION.-Fur moderately long and loose; ears rather small ; tail shorter than the body; general colour gmy washed with yellow, the yellow colour prevailing, especially on the sides of the body; muzzle, inner side of ears, and tarsus, of a rich yellow colour; toes, chin, throat, under parts of body, and rump, white; all the fur deep gray at the base; the hairs on the upper parts and sides of the body broadly annulated near the apex with rich yellow, and at the apex dusky; on the under parts of the body the hairs are broadly tipped with white. Tail rather sparingly furnished with hair, that on the upper surface brown, on the sides yellow, and on the under surface whitish. The hairs of the moustaches are white-some of them dusky at the base. The incisor teeth are rather slender, and of a pale yellow colour. Length from nose to root of tail of tail from nose to ear In. Lines. 3 G 7t 10 Length of tarsus (claws included) of cnr Habitat, Hardy Peninsula, Tierra del Fuego, (February.) In, Lines. 0 3~ The white, which is usua1ly confined to the under parts of the body, in this |