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Show 68 ZOOLOGY OF TilE VOYAGE OF TilE BEAGLE. sides of the body, white; hairs of the back palish gray at the base, those of the belly indistinctly tinted with very pale gray at the roots; ears and moustaches pale brown. Habitat, New South Wales. This species is about half-way between Mus Rattus and Mus musculus in size, and is remarkable for its delicate colouring. The molar teeth are figured in Plate 34; fig. 18. a, represents the molars of the upper jaw, and fig . 18. b, those of the lower. GE us-REITHRODON.* Dentes primares %; iuj'eriaribus acutis, gracilibus, et antice la:vibtts; superiaribus gracilibus, antice lougiturlinaliler sttlcatis. Molares utrinque -3- radicati; prima maximo, ultimo mutww: primo superiore plicas vitreas duas e.cterne et iuterne allemallnt ex!tibenle; secunda, et tertia, plicas duns exteme, interne 1mam: prima inj'eriare plicas vitreas tres externe, duas interne; secunda, plicas duas externe, unam interne; tertia unmn externe et interne, exlti-bentibus. A1·tus incequales: £tnlipedes 4-dactyli, cum pallice exiguo: pedes postici 5-dactyli, digitis e:ctemis et internis brevissimis. Ungues parvuli et debiles. Tarsi subt1is pilasi. Cauda mediaais, pilis brcvibus adpressis instructa. Caput mugnum, fronle convexo: oculis magnis: auribus medioc1·ibus. The present genus according to my views belongs to the family Mw·idce. The modifications of structure which have led me to separate it from the genus JJ-Ius are as follows : Extemal characters.- The most conspicuous points of distinction between the external characters of Reilltroclan and Mus (if we regard M. rattus, lJ'I. decumanus or M. muscuhts as typical examples of that genus,) consist in the arched form of the head, the large size of the eyes, the stout form of the body, and the upper incisors being grooved. The ears, tail and feet are more densely * Puflpoc, a chauucl; Ooov, a tooth. |