198 



THE VOYAGE OF H.M.S. CHALLENGER. 



Specimen. 



Length of left 

 hepatic duct. 



No. 1 

 No. 2 



No. 1 

 No. 2 



Distance from 



pylorus of point 



of entrance into 



intestine of left 



hepatic duct. 



Length of right 

 hepatic duct. 



Pygosceles tceiiiahis. 



10 

 lOJ 



Ajitenodytes longirodris. 



25 

 30 



Distance from 



pylorus of point 



of entrance into 



intestine of right 



hepatic duct. 



13 



12 



37 

 37 



Length of gull 

 bladder. 



4i 



The Pancbeas. 



The pancreas of Emhjptes chrysocome from Tristan d'Acuuha (PI. XIII. fig. 5) con- 

 sists of an elongated glandular mass, measuring 6 inches in length. The upper end 

 or head is triangular in form, and lies in contact with the commencement of the 

 intestine, being wedged in between the latter and the right margin of the muscular 

 portion of the stomach. The remainder of the gland consists of a narrow flattened band, 

 having an average breadth of ^th of an inch. It lies in contact but is not continuous 

 with the enlarged portion or head, and is situated between the two layers of the 

 mesentery, close to the wall of the intestine. In a second specimen of Eudyi^tes 

 chrysocome from Tristan, this segment of the gland was divided into two distinct 

 portions, which, however, were in close contact with one another. In this specimen, 

 each of these portions possessed a duct which opened directly into the intestine. The 

 number of pancreatic ducts apparently varies not only in different species but in dif- 

 ferent specimens of one and the same species. In one specimen of Eudyptes chrysocome 

 from Tristan I found two, and in another three separate pancreatic ducts. In both 

 cases the upper pancreatic duct carried off the secretion from the upper portion or head 

 of the gland, while the remaining elongated riband-like portion was provided in one 

 specimen with a single, and in another with two ducts. The points of entrance of these 

 ducts into the intestine varied in different species as well as in different specimens of the 

 same species. These variations are indicated in the subjoined table. 



