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Show MAMMALIA. 95 it to the Didelphis crassicaudata of Desmarest, which is founded upon Azara's description. The head of the Didelphis crassicaudata is shorter and less pointed tban in most other Opos ums; the ears are unusually small, and the tail is very thick. In the character of the fur also, this species differs from most others, the hairs being rather short and somewhat adpressed; and the soft under-fur being very scanty. Upon separating the fur on the back and sides of the body, numerous young hairs were visible in the specimen from which the above description is taken, and these were of a bright rusty red tint; the colouring of the animal therefore would, in all probability, have been very different after a short time, had it not been killed. Those observed by Azura varied considerably in their colouring. The skull is figured iu Plate 34. figs. 25. Fig. d represents a mmus of the lower jaw. Length of the skull Width Length of nas:1.l bones ---of pabto Width of palate between the posterior molars Distance between forepart of front incisors and forepart of canine Distance between forepart of canine and hinder part of last molar Length of' mmus of lower j:1.w (incisors not included) In. Lines. 4 3 9~ 2~ 0 ~ l 04 " This specimen was caught at Maldonado: it weighed 14~ oz."-D. 3. DroELl'HIS ELEGANS. Pun: XXXI. D. vellere tongo et molli, corpore supra cinereo-fuscescente lavato; pedilms cOI')JOI'efJue snbit'ts albis, oculis nigro circ·temdatis, iulerspatio cinerescente; auribus magnis jiescescentibus; cauda, capite et corpore, paulo breviore. DESCRIPTION.-Muzzle slender and pointed; ears large; tail rather shorter than the head and body taken together; fur long and very soft: general tint of the upper parts of the head and body ashy-gray washed with brown; on the sides of the body, especially near the shoulders, a faint yellowish tint is observable; the lower part of the cheeks, the throat, under parts of the body and the feet, are white, with an inuistinct yellowish tint; the eyes are encircled with brownish-black, which tint is extended forwards on to the sides of the muzzle; the upper surface of the muzzle and the inter-orbital space is |