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Show 1876.J DR. A. GUNTHER ON NEW MAMMALS. 739 I give some of the measurements of two skulls, one (A) being that of an old, the other (B) of a younger, though full-grown, individual. A. millim. B. millim. Total length. . . . . . . . . . . . . . . . .. . . . . . . .. 11 0 Length of nasal bone .• . . . . . . . . . . . . . . . . 33 Length of frontal suture. . • . . . . . . . . . . . . . 39 Least width of nasal bone .............. 9 Length of fronto-intermaxillary suture .... 9 Least width of interorbital space . ...... 39 Distance between incisor and first molar .. 29 Length of upper molar series. . . . . . . . •. . . 24 Width of palate between the second molars . . 9 110 3& 38 8 7 40 30 25 8 The skull of this species resembles much that figured by Blainville (Osteogr. Hystrix, pI. ii.) under the name of Athe?·urafasciculata. I have not seen the skull of this species; but! should have expected it to be more similar to that of A. macrura than it would appear from Blain ville's figure. TRICHYS, g. n. Allied to Lfthe1'ura, but with the tail reduced to a scarcely perceptible projection of the skin. Dentition as in Atherzl?'a, but with the lower incisors more compressed. Facial portion of the skull compressed,. without enlargement of the air-sinuses. A postorbital process. TRICHYS LIPURA, sp, n. (Plate LXXI.) All the upper and lateral parts of the body are densely covered with flat flexible bristles of moderate length, grooved on the upper as well as lower surface. Underfur very scantily represented by fine woolly hairs; and on the rump some long hair-like bristles project beyond the flat ones. On the head and abdomen the bristles are replaced by flat stiff hairs. In the external form and structure of the head, ears, and feet there is no marked difference from Lfthe1'ura, The general tint of the upper parts of the animal is brown, each spine being white at the base, and brown towards the point. On the sides the brown colour gradually passes into the white of the lower parts. Hairs of the long moustache black, the longest hairs having whitish terminations. m. lin. Total length .. . . . . • • . . . . . . . . . . .. ...... 17 0 Distance from nose to ear . • . • . . . . . . . . • . . . 3 0 Length of ear. . . . . . . . . . . . . . .. ......... 1 0 Length of sole of fore foot. . . . . . •• • • . . . . . . l 6 Length of sole of hind foot .... . . • • . . . . . . 2 6 Length of one of the longest flat spines .... 1 8 Skull (figs. 2, 28 , pp. 740-1 ):-The following notes refer chiefly to points in which T?'ichys dIffers from ;1therura. Especially remarkable is the development of a postorbItal process, and of the |