Dr. A. Giinther on some East-African Antelopes. 427 



Measurements. 



Col. Coke's Mr. Thoiuson's 



spec. spec, 



inches. inches. 



Length of the skull 17 



Entire length of horn, measured round 



the curvature 16 I65 



Length of horizontal branch of horn 7 7^ 



Length of distal half of horn 7 1 8|- 



Greatest circumference of horn .... 8 9i 



Mr. Thomson has also brought from the same expedition two 

 frontlets (male and female) of a gazelle, similar to Gazella 

 Graw^n, which, however, after full consideration and compari- 

 son with the specimens in the Natural History Museum, I 

 must consider specifically distinct. Both specimens come 

 from animals which are not only fully adult, but, to judge 

 from the sutures of the preserved part of the skull, of some- 

 what advanced age. The horns start much in the same direc- 

 tion as in Gazella Grantii^ showing, however, scarcely any 

 divergence in the male, and but a slight one in the female ; also 

 their curvature is much less than in Gazella Grantii. The 



b ^— ' c 



Gazella Thomsonii : a ^ ,b and c cJ , 



annulations are strongly marked, not less so behind than in 

 front of the horn, closely arranged and about twenty in 

 number ; only a short distal portion of the horn is smooth. 

 The horns are compressed, without enlargement of the base of 

 the bony core, and much less developed as regards thickness 



