COMPARATIVE ANATOMY OF PANCREAS. 



103 



The structure, position, and appearance of this gland do not differ in any 

 essential respect in the Alligator Cooter {Chelonura serpentina), Loggerhead Turtle 

 {Chelonia caretta), Salt-water Terrapin [Emrjs terrapin), Chicken Terrapin {Emys 

 reticulata). Yellow-bellied Terrapin {Emys serrata), and other carnivorous Terrapins. 

 The following figure represents the pancreas of the Yellow-bellied Terrapin {Emys 

 serrata) . 



Fig. 17. 



Pancreas of a carnivorous Cbelonian {Emys serrata). Reduced one-half diameter.— A. Inferior portion of the oesophagus 

 expanding into the stomach. B. Stomach. P. Pancreas. S. Spleen. 0. Small intestine. 



In the Gopher {Testudo polypliemus) ^ which is the only graminivorous Chelonian 

 in Georgia, the size and appearance of the pancreas are far different. 



It is a long, slender, delicate gland, consisting of several thin slender lobes, sub- 

 divided into numerous small lobules. Its size is far smaller than that of car- 

 nivorous Chelonians. The reason of this will be readily understood when we 

 consider the functions of the gland. 



Fig. 18. 



Pancreas of a graminivorous Chelonian (Testudo pohjphemus), Gopher. Reduced one-half diameter. — A, A. Inferior 

 portion of stomach and small intestine. P, P. Pancreas. S. Spleen. R. Large intestine, which contains grass. 



A comparison of Figs. 16, 17, and 18, illustrates the fact that the pancreas of 

 carnivorous Chelonians is larger than that of the graminivorous ones. 



In Birds, the pancreas is a conglomerate gland, generally of large size, invariably 

 lodged within a loop formed by the duodenum, and generally consists of two por- 



