72 



pancroas. A hiiiiou is not generally appai'eui. Init ihe 

 pr(>senre of siicli is generally associated with a particular 

 phase of the activity of the gland which doubtless did not 

 coincide with the fixation of o\ir material of the organ. 

 J'hey are small and in a single transverse section are 

 composed of few polygonal cells. 



Xot only does the pancreatic tissue form a peri- 

 vascular investment in the vessels in the body cavity, but 

 it extends along the portal veins into the interior of the 

 liver. Text-fig. 1, A. represents a section of a part of the 

 latter organ, and shews a small portal vein cut in trans- 

 verse section with two veinules opening out from it and 

 passing between the hepatic cells. A single layer of 

 pancreatic gland acini forms an investment for the vessel, 

 and the Avhole lies within a space in the hepatic tissue 

 which is probably natural. The acini are elongated per- 

 pendicularly to the surface of the vessel, and the whole is 

 surrounded by a fibrous sheath which sends in partitions 

 between the acini, becoming continuous with the fibrous 

 wall of the vein. Here also a lumen is generally wanting, 

 or is only with diiticulty ajiparent in the acini. 



In Acipenser, Amia and Lepidostcus Macallum* has 

 described ver}^ similar relations for the pancreas, and the 

 description of the organ given by (iullandf for Salmo 

 answers in all essential respects to that stated above. 

 Maeallum+ has described the pancreas in Amiurus as being 

 imbedded in the liver round the interlobular veins. The 

 diffuse condition of the pancreas seems to be characteristic 

 of most Teleostomatous fishes hitherto investigated, and is 

 most probably quite general. 



* Loc. cit. 



t Life his tory of the Salmon ; Rep. to the Fishery Board of Scotland, 1898 



\ Proo. Canadian Institute, N.S., vol. ii., No. 0, pp. 3S7-il7, 1881. 



