90 
b. Hind and fore limbs subequal in length, withers not appreciably higher 
_ than hind-quarters. Cranium more convex longitudinally. Horns longer 
than the face, spirally twisted. 
a’, Horns present only in the male, inserted just behind eye and rising so 
as to form an obtuse angle with the plane of the face. 
a. Horns flat behind at the base, with a strong external basal ridge and 
rarely more than two complete turns. 
a°®. Hoofs normal, short ; back of the pasterns covered with hair. 
2. TRAGELAPHUS. 
63. Hoofs exceedingly long; back of the pasterns naked. 
3. LiIMNorraeus. 
b?. Horns rounded behind at the base, without external basal ridge, 
forming an open corkscrew spiral, with three complete turns. 
4. STREPSICEROS. 
b'. Horns present in both sexes, inserted farther behind the eye and 
directed straight backwards in the plane of the face. 
5. 'TAUROTRAGUS. 
