CHI >RDATA 



581 



attain a length of four and a quarter meters, with a skin nearly 

 five centimeters thick. 



The ruminants comprise by far the largest number of Ungu- 

 lata ; there are usually no incisors or canines in the upper jaw, 

 and the stomach consists of several chambers, usually four. The 

 food, which is vegetable, when first swallowed, passes from the 

 oesophagus into the first chamber of the stomach, then into the 



FlG. 372. Camelus bactrianus, the camel. (From Brehm's Thierleben.) 



second, and after a time goes upward through the oesophagus to 

 the mouth again, where it is masticated ; then it passes to the 

 third stomach, the opening into the first and second being 

 temporarily closed, and finally into the fourth and thence to 

 the small intestine. The camel family has only the third and 

 fourth digits present, and the toes are provided with fleshy pads 

 on which the animal walks; it includes the genus Camelus 

 (Fig. 372), living in Asia and Africa, with two species, the one- 



