MAMMALIA. . 341 
have either one or two humps upon the back, composed of 
fatty matter; in the paunch are several cells (Fig. 364, a) 
Fic. 364.—a, Water-cells in the paunch of the camel ; 4, foot, showing the 
pad. 
that contain a supply of water to last them in the dry coun- 
try in which they live. Their feet (Fig. 364, 4) are equally 
adapted to the dry sand, the two toes uniting nearly to 
FIG. 365.—The true camel (Camelus dromedartus). 
