130 GREAT GAME OF THE WORLD. 



their number amounting to 10 in the oldest specimen available a 

 number probably but seldom much exceeded. 



Skull diverging from that of Gazella and approaching that of 

 Lithocranius by being unusually low, long in the occipital region 

 with a comparatively straight cranio-facial angle with very small 

 bullse with the postero-internal wall of the suborbital fossae imperfect, 

 and with a remarkably small and slender lower jaw. On the other 

 hand, it differs from the same skull by being peculiar to a less extent 

 in all these points by the greater development of the premaxillae 

 posteriorly, where they have a broad articulation with the nasals, by 

 the larger nasals and smaller interparietal, and by the larger and more 

 powerful teeth, which are absolutely larger in the smaller animal. 



In its skull characters, therefore, Ammodorcas stands just inter- 

 mediate between Gazella and Lithocranius ; in its muzzle and in the 

 characters of its markings it agrees fairly with both, but in general 

 form with the latter only, that animal, like it, being peculiar for its 

 extraordinarily long neck, and finally, in the curvature of its horns it 

 differs absolutely from both, as also from any of the other Gazelline 

 genera, while it agrees with a group so different from it in all essential 

 respects that the resemblance must evidently be an accidental one 

 and not indicative of any relationship. Presumably the whole of 

 the horn of this species is homologous with the terminal three or 

 four inches of the Gerenook's horns, that is to say, with the 

 upwardly curved part the greater part of the horn having become 

 obsolete while the upwardly curved tips have attained to a remark- 

 able proportionate development. 



The following are the dimensions of the skull of specimen : 



Length, occiput to gnathion, 210 millim., tip of nasals to occiput 

 176, greatest breadth 95 ; height, crown to angle of lower jaw, 94 ; 

 nasals, length 67, breadth 26 ; interparietal, length 24, breadth 39 ; 

 height of orbital opening 35, gnathion to front of anterior premolar 

 63 ; length of molar series 53 ; lower jaw, condyle to front of 

 symphysis 153 ; height from coronoid process to angle 70 ; height of 

 ramus at centre of m. 15*4, at posterior end of symphysis 9. 



In a letter addressed by Mr. Clarke to Mr. Rowland Ward, the 

 following notes on the appearance and habits of this species are 



