1910. 



CUTANEOUS SCENT-GLANDS OF RUMINANTS. 



981 



them tightly together; and the upper portion of the'^interdigital 

 cleft in front is deepened, showing the beginning of the differ- 

 entiation of the glandular pouch. Hardly more advanced is the 

 hind foot of the Muntjacs of the genus Cervulas, except that in 

 C. muntjac part of the glandular area is markedly more pocket- 

 like. A further stage is exemplified by the hind foot of the Hog- 

 Deer {A. 2)orcinus) and of the Axis Deer (^1. axis), where the web 



A. Median vertical section of foot of Lama vicugna ; gl., glandular area. 



B. Anterior aspect of foot of Dicotyles collaris. 



C. Median vertical section of dorsal gland of the same. 



D. Anterior aspect of foot of Phacochoerus. 



extends further forwards from the heels, holding the hoofs more 

 securely and tightly together, the interdigital cleft being shallower 

 owing to the greater space between the anterior and posterior 

 walls of the pastern-web. It is quite easy to imagine the steps 

 by which the comparatively narrow pocket-like gland of Ilazama, 

 Gervulus, and Ranyifer has been derived from a much longer and 

 Proc. Zool. Soc— 1910, No. LXIV. 64 



