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Genus V. ANTIDORCAS. 
Type. 
Antidorcas, Sund. Pecora, K. Vet.-Ak. Handl. 1845, p. 271 (1847). . <A. EUCHORE. 
General characters as in Gazella, but, as in Saiga tatarica alone of Rumi- 
nants, with only two lower premolars, and the upper anterior premolar reduced 
to half the size of the second. Back with a peculiar elongate evertible 
fold in the skin. 
Skull with small but particularly deep anteorbital fosse, no anteorbital 
vacuities, and very broad and open posterior nares. 
Horns medium, lyrate, twisted inwards, with a double serpentine curvature, 
convex inwards and in front below, outwards and behind above. The points 
turned inwards or backwards. 
Range of Genus. Africa south of the Zambesi. 
