1909.] OF SNAKES OF THE GENUS BOA. 927 



There is some variation among the Boine Snakes in the 

 arrangement of the pancreas and spleen*. It is, therefore, 

 desirable to record the conditions that I have found in Boa 

 occidentalis. I find in that snake that the large rounded pancreas 

 which lies in connection with the duodenal wall is connected with 

 the spleen by an isthmus of pancreatic tissue not of very great 



Text-fiff. 285. 



PC 



End of liver of Boa occidentalis. 

 c. Coelomic sac of liver partly removed, p.c. Postcardinal vein. 



length, but slender and widening out at its contact with the 

 spleen. The latter organ is lobate, and in consequence somewhat 

 mulberry-like in contour. I have no observations concerning 

 these various glands in Boa madagascariensis. 



* For a summary of the facts see mv paper upon Corallus already' quoted in 

 P. Z. S. 1908, p. 147. 



