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 fossa 3 . The air- 
