EEGIONAL SUBDIVISIONS OF THE STOMACH. 



59 



In the ostrich, as shown \nFig. 11, the local distribution of the glan- 

 Fi d- n- _ duke very obviously marks out a regional dis- 



tribution of function. C is the cardiac cav- 

 ity, the mucous membrane of which is stud- 

 ded here and there with glands ; G G are the 

 surfaces of the gizzard. Among the higher 

 quadrupeds, the evidences of a similar divis- 



Fig. 12. Fiy. 13. 



Interior of stomach of African ostrich. Stomach of dormouse. Stomach of Cape hyrax. 



ion of function are presented. Thus, in the dormouse, fig. 12, there are 

 two compartments : a cardiac, C, and a pyloric, P ; the same Digestive com . 

 being exhibited more perfectly in the Cape hyrax, Fig. 13. partments of 

 In these -cases the cardiac compartment is often lined with 

 cuticle, but the pyloric not. An increase in the number of these cavities 

 occurs as the food becomes more heterogeneous. In the porcupine, Fig. 

 14, there are four, and in the porpoise, Fig. 15, five. The stomach of 



Fig. 14. Fig. 15. Fig. 10. 



Stomach of porcupine. Stomach of porpoise. Stomach of kangaroo. 



the kangaroo, as shown in Fig. 16, possesses a multitude of these cham- 

 bers or compartments, and therefore offers a good illustration of the sub- 

 divisions of stomach digestion. 



. IT. The case of ruminants 



possesses a special inter- 

 est. In these there- are 

 what might be termed 

 four different digestive 

 chambers, as is shown in 

 Fig. 17, in which a is the 



Digestive cavities of a ruminant. O3SOphagUS ; b, the inglu- 



