

ANATOMY OF VERTEBRATES. 



306 



compact triangular form in the Rattlesnake, 1 where it is closely 

 at I ached to the commencement of the intestine, and is perforated by 

 the biliary ducts. The pancreas is small and flattened in Lizards, 

 usually dividing as it recedes from the attachment by the duct to 



the duodenum into a portion accompanying 

 the biliary duct, and another extending to 

 or towards the spleen. It is very small in 

 the Iguana. In the Crocodile the pan- 

 creas is divided into two elongated lobes, 

 and sometimes sends its secretion into the 

 duodenum by two ducts. In Chelydra 

 serpentina the pancreas extends from the 

 pylorus some inches along the duodenum, 

 dividing and again uniting, forming a loop, 

 and giving off a process which extends to 

 the spleen. In the Turtle ( Chelone Midas) 

 the pancreatic duct terminates on a pa- 

 pilla, which projects into the terminal ex- 

 pansion, or ' ampulla,' of the bile-duct. 

 The pancreas in carnivorous Terrapins (JEmys) is more bulky 

 and compact in form than in the fucivorous Turtles ( Chelone). 



Thus in the vegetable-feeding Gopher the pancreas is -3^^ of 

 the total weight of the animal : whilst in the carnivorous Snapper 

 it is -g-^y of the total weight of the animal. As the proportion 

 of fat consumed by Carnivora must be greater than that by 

 Herbivora, the results of the above comparative observations 

 accord with the view of the use of the pancreas in preparing 

 fatty matters for absorption. 2 



Liver, pancreas, and spleen of 

 the Frog (Sana), ccxxsi. 



1 xx. vol. i. p. 235, no. 778. 



2 Dr. Jones, ccxlv. p. 107, ascertained the weight of the body and of the pancreas 

 in several American Reptilia, and gives the relative weight of the latter in the sub- 

 joined form. 



Rana Catesbiana (Bull-frog) 

 Heterodon niger (Black viper) 

 Psammophisjlagelliformis (Coachwhip snake) 

 Coluber guttatus (Corn snake) . 

 Coluber constrictor (Black snake) 

 Crotalus durissus (Banded rattlesnake) 

 Chelone caretta (Loggerhead turtle) . 

 Chelydra serpentina (Snapping turtle) 

 Emys terrapin (Salt-water terrapin) . 

 Emys reticulata (Chicken terrapin) 

 Emys serrata (Yellow-bellied terrapin) 

 Testudo Polyphemus (male Gopher) . 



Number of times 



the weight 

 of its pancreas. 



1088 



537 



1353 



1371 



472 



965 



518 



630 



994 



763 



1067 



3500 



