May 1897. East African Collection of Mammals — Elliot. 129 



there is a great depression, causing the facial region to be on a 

 considerably lower level than the occipital. Frontals, rather 

 short and narrow. The nasals are very long and pointed pos 

 teriorly. The premaxillae are long and broad and do not reach 

 the nasals, but this is not a unique character, as it is seen in 

 other gazelles, such as G. pchelni. The auditory bullae are rather 

 small, but long for their width and slightly compressed laterally. 

 The mesopterygoid fossa is narrow and very long, while the pal- 

 atines are comparatively short. The tooth row is short and the 

 teeth small and of the brachyodont type. The orbit is very large 

 and surrounded by bone, and there is a slight antorbital depres- 

 sion. The foramen ovale is very large, irregularly oval. Rami 

 of the mandible, very long and slender, and the posterior portion 

 is also comparatively narrow, the lower edge of the angle being 

 on a line with that of the rami, and its posterior edge only slightly 

 concave. The coronoid process is long and slender and inclined 

 backwards, its tip projecting somewhat behind the condyle. It 

 is a singularly long and narrow skull, the greatest width just in 

 front of the horns, and from the eyes tapering rapidly to the nose, 

 giving the animal when viewed from the front in life a very pecu- 

 liar and unusual expression. The horns are lyrate, curving back- 

 wards, and then suddenly upward and slightly forward at the tip. 

 They are annulated irregularly nearly to the tip, and average 

 about 12 inches along the curve. Extreme length is between 

 15 and 16 inches, but such horns are rare. They vary some- 

 what in the style of the curve, and in some cases the tips tura 

 inwards toward each other instead of forward. 



INCHES. 



Total length 10.25 



Anterior edge of nasals to tip of premaxilla 1.20 



Median length of nasals 3.20 



Posterior end of nasals to fronto-parietal suture (median line). 2.40 



Width of skull at anterior edge of orbit 2.40 



Length of skull from fronto-parietal suture to supraoccipital. . 3.45 



Center of external auditory meatus to supraoccipital 2.60 



Inferior rim of orbit to alveolus of third upper molar i.io 



Inferior edge of ramus to alveolus of first lower molar 70 



Extent of upper premolars 85 



" " " molars 1. 15 



" " lower premolars 70 



" " " molars 1.30 



Length of premaxilla; 2.77 



Length of diastema of the lower jaw 2.50 



Circumference of horns at base 5.10 



Length of horns along the curve 12.70 



