122 THE DIGESTIVE SYSTEM. 



is pepsin, hydrochloric acid being present in the watery part in 

 the strength of about 2 parts to the 1000 of water. Externally 

 this stomach is somewhat conical in shape, the apex being the 

 part joining the intestines. It possesses three coats. The in- 

 ternal surface, however, differs in appearance from that of the 

 other stomachs, being red and shining, the mucous membrane 

 being very vascular, the glands secreting the gastric juice, being 

 embedded in its folds. By its internal surface being in the form 

 of plaits arranged lengthwise, the digestive capacity of the organ 

 is considerably increased. The entrance to this stomach is close 

 to the entrance of the omasmn, the exit being situated at the 

 apex, which is closed by the valve called the pylorus, which is a 

 duplicature of the miicous lining of the viscus. 



