1891.] ANTELOPES FROM SOMALI-LAND. 207 



be of so much interest zoologically, one of them representing not 

 only a new species, and that a most beautiful one, but even a new 

 genus, that I have thought it well to go through the whole collection, 

 to record the length of the horns in all the specimens, such records 

 of their local development being often very useful, and to make such 

 notes upon them as appeared necessary. 



The species represented in the collection are 8 in number, and, 

 with the exception of the new one, Ammodorcas clarkei, have all been 

 obtained in Somali-land before, although they have not in all cases 

 been recorded. 



Besides the Antelopes, Mr. Clarke obtained in Somali-land a skin 

 of Proteles cristatus, Sparrm., a species, so far as I am aware, not 

 hitherto recorded north of Angola. 



1. Oryx beisa, Riipp. 

 c?.L.' 781 millim. CM 58. 



2. LiTHOCRANIUS ^ WALLERI, BrOokc. 



d". L. 336. C. 140. Rings 27. 



d. L. 311. C. 133. Rings—. 



c?. L. 313. C. 130. Rings 31. 



As usual with Somali collections, several Gerenook Gazelles were 

 obtained. This remarkable species has been made the type of a 

 distinct genus by Dr. Kohl, and I believe rightly, for not only has it 

 a very different skull from that of Gazella, but its external form and 

 its habits are both quite unlike those of any member of the genus. 



3. Ammodorcas clarkei *, g, et sp. n. (Plates XXI. & 

 XXII.) 



a. L. ° (round curve posteriorly) 286 ; do. anteriorly 279 ; base 

 to tip in a straight line 222. C. 120; tip to tip 114. Rings 10. 



b. L. (round curve posteriorly) 267 ; do. anteriorly 254 ; base 

 to tip in a straight line 222. C. 114; tip to tip 89. Rings 8. 



c. L. (round curve posteriorly) 245 ; do. anteriorly 245 ; base 

 to tip in a straight line 221. C. 112; tip to tip 134. Rings 7. 



This most remarkable animal combines the horns of a Reed-buck 

 (Cervicapra) with the essential characters of a Gazelle, showing a 

 special relationship to that most aberrant Gazelle the Gerenook 

 (Lithocranius wa/Zen), and appears certainly to be worthy of generic 

 distinction. On the first arrival of the specimens, before the skulls 

 were cleaned, and before Mr. Sclater had received from Mr. Swayne 

 the face-skins mentioned below, the animal was naturally supposed 

 to be a Reed-buck from the character of its horns, little likely as it 



1 Length round curves anteriorly. ^ Circumference at base. 



3 '' Litucranius" Kohl, Ann. Mus. Wien, i. p. 82 (1886). 



* Preliminary description of the species given, under the erroneous generic 

 name of Cervicapra, Ann. Mag. N. H. (6) vii. p. 304 (March 1891). See also 

 Mr. Sclater's remarks, above, p. 1 97. 



" For the benefit of sportsmen and others not having metric measures avail- 

 able, it may be noted that the five measurements of the horns of a, in English 

 inches, are 11:^, 11 '0, 8|, 4|, and 4| respectively. 



