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Show (34 ZOOLOGY OF THE VOYAGE Ole THE BEAULE. This species is c]oscly allied to the last, but differs in being rather smaller, in having smaller eat'S which are well clothed with hair, and not sparingly furnished as in JJ1us griseo-jlavus, and in having a shorter tail which, like the ears, is more densely clothed with hairs ; in the structure of the molar teeth there also differences which will be better understood by comparing the drawings. Fig. 10, a, Plate 34, represents the molars of the upper jaw, and 10, b, those of the lower jaw. " Extremely abunJant in the coarse grass and thickets in the ravines at Port Desire and Santa Cruz: was caught in a trap baited with cheese."- D. 25. Mus DARWINII. PLATE XXIII. Mus Darwinii, lVaterlt., Proceedings of the Zoologic3.l Society of London for February J 837, p. 28. JJI. supra pilis paltide cinnarnomeis et nigrescentib·us inlennixtis; ante oculos cinerascentibus; genis, lateribltS corporis, et caztdlt prope basin, pallide cinnamomeis; partibns iuferim·ibus pedibusque alb is; a·ttribus perrnagnis; cauda caput c01pusqnejere requante, supra fusco-nigricante, subtus alblt. DESCRIPTION.-Form robust; ears immensely large; tail nearly equal in length to the head and body taken together; fore feet very small; tarsi moderate; fur very long and soft; general tint of the upper parts pale cinnamon yellow; on the rump a richer yellow hue prevail~. and on the back there is a brownish tint, owing to the interspersed long hairs being of that colour; the upper surface of the head is grayish ; the cheeks, like the sides of the body, arc of a delicate yellow colour, faintly clouded with brown ; the sides of the muzzle, lower part of the cheeks and sides of the body, and the whole under parts, are pure white; the feet and tail arc also white, if we except the upper surface of the latter, which is dark brown ; the yellow tint of the sides of the body is extended downwards on the outer side of the fore Ieo-s aml on the back of the hinder legs; the cars arc but sparingly furnished with hair, excepting on the fore part, externally, where they are of a brownish colour; the millltte ltairs which cover the remaining parts of the ear are very pale; the tail is well clothed with hairs; the hairs of the moustaches arc numerous and very long; they are for the most part blackish at the base, and gTay at the apex; the incisors are rather slender, the upper pair are an orange colour, and the lower, yellow; the hait·s of the ordinary fur of the back arc gray at |