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Show 48 ZOOLOGY OF TilE VOYAGE OF TilE BEAGLE. In. Lines. ln . Lines. LC'ngth from nose to root of tail of tail 4· 2 Length of tn.rsus of car from nose to cn.r 1 0 ~ Habitat, Port Famine, Strait of Magellan. . AI: s Mttscultts . the tail is rather longer iu propor- This mouse IS larger than u ; lite so large in proportion to the tion; the tarsi much longer; the eafrsM:are IM:lo qtl· s I.Il size) and they are densely . 1 ·d that o ?ts uscu n ' . . head, (which great y excee s. I I colour the animal here descnbed IS l .l ·tl h · The fur 1s onger. n , clot 1eu w1 1 :ur. I l 8 one specimen however before me rather darket· titan the common mouse. lav which very nearly agrees in this respect. • d (3 b The dentition is figured in Plate 34, figs. G, a. an , . the Murid::c of the · 1 · 1 M. Darwin bestowed upon From the attention w uc 1 r. 1. llection affords materials for a l t f S uth America I presnme us co sout lem par ·s o o : ' cies of that portion of the globe. The tolerably complete monograph of ~1 e spe t . in Mr Darwin's collection, hut species above described, however, ocs no occm . I t d that I might is here introuuccd in oruerl· todl:Uat.ket.tohnes w:\~c~~o::~s~m~e::~ea: it and oth er 1 ar1y point out t 1e IS me L 1 . mpoercei esc he.e re describeu, the account gt.v en b Y Mr · Bennett in the Procee<. mgs being very short. Mus ARE NICOLA. l'LAm XIII. Mu arcnicob , lVated t., P roceedings of the Zoological Society of London, for February 1837, P· 18. J11. supra Juscus, subl·us cinerescenli-albus, pallide flavo linctus;. aw·ibus rn ediocl ·ibu~ 1'0lundatis, pilis jlavis fusc isque obsitis; cauda quoad long itudwem corpus mquante' pedibus cinerescenli-albis: tar sis mediocribus. DE e mPTIO .- Fur lonO', moderately soft; general colour deep ~rown; sid ~sh ~f the body with a vebr y obscure y. ellowt· s 11 h ue; un d er· pal· ts dtrty ob -rny wtt a faint yellow tint. All the fnr deep gray at the base; the hairs of the upp~r Part of the body obscurely annulated with yellowish brown near the apex, an• d du:5ky at the apex; the longer hal.l 's are black. F' Cet 1n o. wm·s .h ' covered above with brown-white hairs; tarsi short. Tail short, blacktsh above, brown-white beneath. Ears small, well clothed with hairs; those on the .MAMMALIA. 49 inucr side are yellow at the apex and gray at the base ; on the outer side they are of a brownish colour, and on the fore part blackish. The hairs of the moustaches are short anu slender, and of a brownish colour. The head is large. ln. Lines. LcngLh from noso to root of ta.il ln. Lines. 4 3 Length of tarsus (claws included) 0 10 of tail 2 9 of car 0 4¢ from nose to ear 0 Habitat, Maldonado, La Plata, (June.) This species is rather larger than the common mouse; its head is proportionately larger, the ears are smaller, the tail considerably shorter, and the fur longer, and in colouring it is a little darker. In size and colour it resembles M. Magellauicus, but the shorter tail and tarsi, and the smaller size of the ears will serve to distinguish it. The skull of Mus arenicola, Plate 34. fig. 7, a, is rather larger than that of Mus Musculus, the nasal portion is broader, the interparietal bone is much smaller, especially in antero-posterior extent; the zygomatic arches are more slender, and the incisive foramina are broader. The horizontal ramus of the lower jaw (Pl. 34. fig. 7, d.) is rather less curved, the coronoid process is more elongated, and the condyloid is narrower and also larger. The length of the skull is 11 lines and a half; the width is G-} lines. The molars of the upper jaw are figured in plate 34 fig. 7, b. and those of the under jaw, fig. 7, c. "'l' his specimen was caught on the open grassy plain, by a trap baited with a piece of bird; it is, however, very abundant in the sand hillocks near the coast of the Plata."-D. 13. Mus BUACHIOTIS. PLATE XIV. Mus brachiotis, Watc1·lt., Proceedings of the Zoological Society of London for February 1837, p. 17. lJl. supra obscun} fuscus, subtus obscure g1·iseo tinctus ,· pedibus gt·iseo-fuscis ; au1·ibus pm·mdis; caudtl quoad longituclinem, corpus Jere cequante: vellere longo et molli. DESCRIPTION.-Fur soft, very long, and dense; ears very small; general colou1· brown : the hairs of the upper parts, and sides of the head and body are of H |