540 MR. P. JL. SCLATER ON [Nov. 18, 



form of the horns is much the same in both specimens. The chief 

 differences are in the slightly greater size and greater length of the 

 horns in Mr. James's specimen, and especially in the more decided 

 twist forward at their anterior extremities. On the whole, however, 

 I think it better to conclude that they belong to the same species 

 until the contrary is shown. 



The external form of Gasella walleri (assuming this view to be 

 correct) may be shortly described as follows : — Horns lyrate, strongly 

 ringed, running backward almost in a line with the face, and bent 

 forward at the tips. Length, following the curve along the upper 

 surface, 14 inches; in a straight line from base to tip, 11 inches; 

 distance between the point at the tips 3 inches ; extreme width 7\ 

 inches ; circumference of horn near the base 5 inches. 



Colour. Nose, front of face, top of head, neck above and on 

 each side, and brown dorsal band (6 to 7 inches in width) extending 

 all down the back dark brown, almost chestnut. Flanks, separated 

 by a well-marked margin from the dorsal colour, pale brown ; sides 

 of face round the eyes, chin , and line below the throat, and body 

 beneath white. Length of skin, from nape to the base of the tail, 

 about 48 inches. 



Hab. Somali-land, vicinity of Berberah. 



I may remark that of two pairs of horns in the British Museum 

 received from Sir John Kirk and determined as Gasella walleri, one 

 pair nearly resemble the typical specimen and the other Mr. James's 

 head. 



4. Gazeljla spekii, Blyth, Cat. Mamm. Mus. As. Soc. p. 172 

 (1863). 



The skin of a small species, probably the same as that to which 

 Mr. Blyth gave this name from Speke's specimens obtained at 

 Berberah l . 



5. Eauus asinus somalicus, sp. (aut subsp.) nov. (Plate L. 

 fig. 1.) 



Of the Wild Ass of Somali-land Mi 1 . Hagenbeck has not only 

 furnished us with the flat skin which I now exhibit, but has also 

 sent us on deposit a fine living male specimen, which was re- 

 ceived on the 11th of August last, and is now in excellent con- 

 dition. 



We have also, fortunately, living in the Gardens a specimen of 

 another African Wild Ass, from the Nubian Desert, purchased in 

 May 1881 ; so that it is easy to institute a comparison between the 

 two, and to assure ourselves that they belong apparently to distinct 

 species or subspecies. 



As will be seen by Mr. Smit's drawings which I now exhibit, the 

 Somali Ass (PI. L. fig. 1) differs from that of the Nubian Desert 

 (PI. L. fig. 2) in its generally paler and more greyish colour, in the 

 entire absence of the cross-stripe over the shoulders, in the very 

 slight indication of the dorsal line, and in the numerous black rnark- 



1 Cf. Blanford, Geol. & Zool. Abyss, p. 361. 



