COMPARATIVE WEIGHTS OF THE PANCREAS. 107 



Comparative Weights of the Pancreas of Carnivorous Fishes and Reptiles. 





Number of times the 

 weight of its pancreas. 



Weight of Tiygon sahina (Female Stingray) ..... 



1071 





ZygcFjia malleus (Hammerhead Shark) .... 



1045 





ZygcEiia ynallevs (Hammerhead Sliark) .... 



156.3 



i ( 



Lepisostens ossetis (Female Garfish) .... 



193 



n 



Lepisostetis ossetis (Garfish) ..... 



272 



t ( 



Jiana cateshceana [BnWh'Og) ..... 



1088 



1 1 



Ileterodon niger (Black Viper) ..... 



537 





Psammophis flagelUformis (Coachwhip Snake) 



1353 





Coluber guttatus (Corn Snake) ..... 



1371 





Colnber constrictor (Black Snake) ..... 



472 



1 i 



Crotalus durissus (Banded Rattlesnake) .... 



965 





Ghelonia carctta (Loggerhead Tnrtle) .... 



518 



1 1 



Cheloniira serpentina (Snapping Turtle) .... 



630 



i t 



Emys terrapin (Salt-water Terrapin) .... 



994 





Emys reticulata (Cliicken Terrapin) .... 



763 



t ( 



Emys serrata (Yellow-bellied Terrapin) .... 



1067 





Emys serrata (Male Yellow-bellied Terrapin) 



1200 



n 



Emys serrata (Female Yellow-bellied Terrapin) 



1343 



Comparative Weights of the Pancreas of Frvgivorovs Chelonians. 





Number of times the 

 weight of its pancreas. 



Weight of Testudo polyphemns (Male Gopher) .... 

 " Testudo polyphemus (Male Gopher) .... 



3500 

 3061 



Comparative Weights of the Pancreas of Carnivorous Mammals. 





Number of times the 

 weight of its pancreas. 



Weight of Procyon lotor (Female Raccoon) ..... 



" Procyon lotor (Female Raccoon) ..... 



" Procyon lotor (Female Raccoon) ..... 



" Procyon lotor (foetus of Raccoon) ..... 



" Common Cat ....... 



" Pointer Dog ....... 



" Didelphis Virginianus (Opossum) ..... 



241 



155 

 259 

 583 

 402 

 337 

 192 



Comparative Weights of tJie Pancreas of Frugivorous and Granivorous Mammals. 





Number of times the 

 weight of its pancreas. 



Weight of common sheep ....... 



" Sciurus Carolinensis (Gray Squirrel) .... 



1125 

 3026 



By comparing these numbers, we arrive at the following conclusions : — 

 1. The pancreas of the Garfish [Lepisosteus ossem), a powerful, voracious and 

 active fish, is much larger than that of more sluggish species. The Garfish con- 

 sumes large numbers of small fishes, which it readily captures with its long and 

 well armed jaws. The tissues and organs, especially the liver of fishes, contain 

 much oil, and consequently a large gland is needed to afford a sufficient amount of 

 the peculiar substance absolutely requisite for the preparation of the oleaginous 



