CHARACTERS OF THE CAMELIDiE. 



547 



naked, depressed glandular area, overlapped by hair, was about 

 four times as long as wide, and gradually narrowed at its distal 

 end. In a male Alpaca the glandular area Avas more exposed 

 than in the Vicuiia, was not depressed but flat, and was only 

 overlapped by hair at the extreme margin above distally. It was 

 also shorter and differently shaped, its length being 1| inches and 

 its breadth | of an inch; the lower border was sinuously convex 

 and the upper had a submedian bulge; its proximal and distal 

 ends Avere approximately equal in width, the former being 

 7| inches from the hock, the latter 5 inches from the fetlock. 

 (Text-fig. 39, A.) 



The feet of Gamelus dromedarius are more specialized than 

 those of Lama. The two digits are fused nearly up to the hoofs, 

 so that their under sides form a continuous sole, about as wide as 

 long, with at most, a shallow, irregular, median crease to mark 



Text-figure 44. 



Upper view of foot of Camelus dromedaritis. 



the line of union. At the digital end of the sole there is a 

 tolerably deep angular emargination where the digits are free 

 and diverge from one another. The fore foot is both wider and 

 longer than the hind foot, and in the specimen examined was 

 narrowed posteriorly, the hinder edge of the sole, or heel, showing 

 a shallow angular emargination. In the hind foot, on the con- 

 trary, the posterior border of the sole was convexly rounded, and 

 formed a continuous curve with the lateral margins, which, like 

 those of the fore foot, were tolerably evenly but lightly convex. 

 This hind foot was asymmetrical, the inner digit being larger 

 than the outer, and the proximal cleft between them Avas tAvisted 

 externally at its deepest part. On the upper side of both fore 

 and hind foot there is a deep, long interdigital depression lined 

 throughout with hair, and glandular, the secietion having a 

 strong odour like the urine of Mus musculus. The skin of the 

 PROC. ZooL. See— 1923, No. XXXYI. 36 



