984 Mu. R. I. PococK ox THE [June 14, 



some of the Hartebeests, the Sassahy {Bamaliscusllunatus), for 

 exain})le, are extraonliuaiily fleet of foot. 



5. In the Cervica[)iina', the hirger species of Kobus find Adenota 

 have no interdigital clefts or glands ; only in the comparatively 

 small and lightly l)uilt genus Felea are the clefts retained in the 

 form of Siiccular glands with a small orifice. 



6. All the Duikers (Cephalophina') are of small or very small 

 size and live in the foiest on soft yielding ground or in fairly open 

 country overgrown with scrub. They have large interdigital 

 clefts and pedal glands, the scent of which is probably useful for 

 tracking individuals concealed l)y the bush, through which they 

 dive away when alarmed. 



7. The Keotragina' {Ix'ap/iicerus, Madoqua, Ourehia) are also of 

 small size and liglitly Iniilt, and mostly frequent country overgrown 

 with bush or scrub. They have lai-ge interdigital clefts and glands, 

 by means of which one individual could silently follow by scent 

 another hidden from view. iJorcotracjns, on the contrary, lives 

 on rocky hill-sides and has the hoofs shortened to lessen their 

 spread at the tips, the heel-tie thickened to hold them tightly 

 together, and the sole and heel modified to form a soft pad to 

 break the force of a leap and prevent slipping, the inteidigital 

 cleft and gland being at the same time retained. 



8. The Klipspringer [Oreotrayus), commonly believed to be 

 related to the Neoti-aginse, although of small size and light weight, 

 has lost the interdigital clefts. His habitat is rocky crags, where 

 he leaps surelootedly from ])oint to point, the hoofs although 

 separable being firmly bountl together by the thick interungual 

 integument, 



9. All the Antilopinje (Gazella, Aniilope, Antidorcas) Uve in the 

 plains or more or less open country. They are, on the average, of 

 small size, although larger than the Neotragina?, and of light build, 

 and depend for safety upon their great speed in the open. 

 Although the interdigital clefts are large, the hoofs are held 

 together by a fold of integument running forwards from the heels 

 and restricting their spread to a greater extent than in the Cepha- 

 lophinaj and, on the average, than in the Neotragin;e. 



10. I do not know why Ammodorcas has lost and Lithocranhis 

 has retained the interdigital clefts, unless the explanation may 

 be sought in the totally diflerent modes of progression of the 

 two Antelopes, which more than one observer has recorded. 

 L'dhocrunivs runs with a skulking action, ducking under the 

 bush, with the head stretched forwards ; Ammodorcas, on the 

 contrary, moves with a bold stepping action, holding tail and 

 neck erect. This at least suggests that the Dibatag is more 

 easily kept in view by its companions than the Gei-enuk, and has 

 therefore less need of pedal scent-glands to indicate the direction 

 taken. 



11. In the Ca})iina' the only wild forms which possess well- 

 developed pedal glands lielong to the genus Ovis, the others {Ammo- 

 trayns, J'seiidois, I/emilrayus, and Capra) being without them. 

 'J'he latter difler markedly from Sheep in superior activity and in 



