272 



EASTERN ETHIOPIA 



XXI 



nearest ally of the hartebeest, bridging the gap between 

 gnus and the rest of the antelope sub-family. 



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

 horns arise in connection with the frontal bones. It is 



The Skull of a Bubaline Antelope. 



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

 frontal sinus extends into the base of the 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 fossae are hollowed 

 out by extensions of the nasal chamber ; these spaces, 

 known as the frontal sinuses, contain air and are in 

 direct communication with the nasal fossae. The air- 



