2QO 



COMPARATIVE ZOOLOGY 



of solution, the stomach is usually simple, and lies nearly 

 in the course of the alimentary canal ; but in proportion 

 as the food departs more widely in its composition from 

 the body itself, and is therefore more difficult to digest, 

 we find the stomach increasing in size and complexity, 



FIG. 251. Section of Horse's Stomach; A, FlG. 252. Stomach of the 



left sac; B, right sac; C, duodenum. Porpoise: c, cardiac open- 



ing; /, pyloric opening. 



and turned aside from the general course of the canal, 

 so as to retain the food a longer time. The inlet from 

 the esophagus is called cardiac opening; the outlet 

 leading into the intestines is called pyloric opening. 



In the carnivores, 

 apes, and most odd- 

 toed quadrupeds, the 

 stomach resembles 

 that of man. That 

 of the toothless ant- 

 eater has the lower 

 part turned into a 



FIG. 253. Stomach of the Lion: c, cardiac orifice, or kind of gizzard for 

 f esophagus; A pyloric orifice. crushing its fo^ 



The elephant's is subdivided by numerous folds. In the 

 horse, it is constricted in the middle ; and in the rodents, 

 porpoises, and kangaroos, the constriction is carried so 



