18/6.] 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. B. 



milliui. millim. 



Total length 110 110 



Length of nasal bone 33 38 



Length of frontal suture 39 38 



Least width of nasal bone 9 8 



Length of fronto-intermaxillary suture .... 9 7 



Least width of interorbital space 39 40 



Distance between incisor and first molar 29 30 



Length of upper molar series 24 25 



Width of palate between the second molars. . 9 8 



The skull of this species resembles much that figured by Blainville 

 (Osteogr. Hystrix, pi. ii.) under the name of Atherura fasciculata. 

 I have not seen the skull of this species ; but I should have expected 

 it to be more similar to that of A. macrura than it would appear from 

 Blainville's figure. 



Trichys, g. n. 



Allied to Atherura, but with the tail reduced to a scarcely per- 

 ceptible projection of the skin. Dentition as in Atherura, but with 

 the lower incisors more compressed. Facial portion of the skull com- 

 pressed, 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 pro- 

 ject 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 Atherura, 

 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. 



in. lin. 



Total length 17 



Distance from nose to ear 3 



Length of ear 1 



Length of sole of fore foot I 6 



Length of sole of hind foot 2 6 



Length of one of the longest flat spines .... 1 8 



Skull (figs. 2, 2 a , pp. 740-1). — The following notes refer chiefly 

 to points in which Trichys differs from Atherura. Especially 

 remarkable is the development of a postorbital process, and of the 



