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Show 332 PROF. R. COLLETT ON MAMMALS [Mar. 16, P2 and p3 always absent; p4 present, long, tricuspid, rather broad behind. Molars as in upper jaw. YOUNG, IN SPIRIT. Size of a half-grown rat. Length from snout to vent about 100 mm., tail 81 m m . Body still almost naked ; the vibrissas only are well developed, forming 7 rows. A tuft of long hairs on the wart-like protuberance on the inner surface of the forearm. Lower incisors half developed. Pads on hands and feet very large, with exceedingly fine transverse striations. Number of palmar pads 5 : one very large posteroexternal, one large pollical, three anterior (as usual only one below 3rd aud 4th finger). Sole-pads 6, one very large postero-exterual, two pollicals, three anterior (one only below the connected 2nd and 3rd toe). The small pads below the tip of each finger and toe are comparatively large and distinct. Claws proportionally very short. LOCALITY. Hab. The Rock Phalanger inhabits the granite formations of the western heads of the River Mary, Arnhem Land, and is tolerably numerous there on the great central tableland. During the daytime it hides amongst the colossal boulders, and leaves the rocks only at night, when it ascends the trees in search of food. This consists principally of the soft parts of a kind of berry with large stone, like a giant cherry (belonging to the genus Zlzyphus ?). It never sleeps in hollow trees, like its congeners, but it will, when roused, occasionally take refuge in a tree. Native name : "Wogoit. 24. PETAURUS BREVICEPS, Waterh., 1838. Petaurus breviceps, var. typicus, Thos. Cat. Mars. Monotr, Brit. Mus. p. 156 (188*); Ogilby, Cat. Austral. M a m m . p. 34 (1892). N. Australia: Mt. Showbridge, March 16th, 1895 (one specimen). Mary River, M a y 1895 (one skull). Shin. Length of female from snout to vent (measured from the skin (about 170 mm., tail (to tip of hairs) 230 m m . Dorsal stripe strongly marked; tip of tail (in the single specimen) white. Young. Two young ones (size of a mouse) in spirit. Length from snout to vent 65 mm., tail 85 m m . Tip of tail white. One young (a little larger). Length from snout to vent 85 mm., tail 110 m m . Tip of tail black. Dorsal stripe well marked in all; tail still short-haired. |