272 



EASTERN ETHIOPIA 



XXI 



nearest ally of the havtebeest, bridging the gap between 

 gnus and the rest of 1,he antelope sub-family. 



In all antelopes, indeed in all the bovine family, the 

 horns arise iu connection with the frontal l:)ones. It is 



The Skull of a Bubaline Antelope. 



Tlie horn is shown in section in order to demonstrate that the 

 frontal sinus extends into the base of tlie horn core. 

 (Museum, Royal College of Surgeons, England.) 



also well known that those portions of the frontal bones 

 which are in relation with the nasal fossre are hollowed 

 out l)y extensions of the nasal chanil)er ; these spaces, 

 known as the frontal sinuses, contain air and are in 

 direct communication with the nasal fossas. The air- 



