806 Proceedings of Royal Society of Edinburgh. [sess. 
made a most careful search for the bile duct in both the wall of the 
last gastric cavity and the duodenum, hut could find no trace of it ; 
we therefore came to the conclusion that it must open lower down 
in the duodenum.* Of this part of the alimentary canal some 
6 inches attached to the stomach has been examined. Immediately 
after the constriction at the pylorus, the intestine expands to a 
diameter of 1J inches; the mucous membrane is at first thrown 
into longitudinal ridges, which become irregularly convoluted at a 
distance of 5 inches from the pylorus. 
The intestine measures from pylorus to anus 97 feet in an adult 
animal, so that the length of the intestine is to that of the body as 
7 is to 1 — about the usual proportion in Delphinidse. There is no 
separation into large and small intestine. 
The structure of the wall of the duodenal portion has been already 
mentioned. In the intestine the muscular layers attain consider- 
able thickness, both the outer longitudinal and the inner circular 
layers of the muscular coat being well formed, whilst the mus- 
cularis mucosae is exceedingly thick, and is thrown into folds 
from which bundles of muscular tissue extend between the gland 
follicles. 
The glands, as we have seen, are in the form of bundles of 
follicles, separated by well-marked septa of fibrous tissue. The 
secreting tubes appear to have a somewhat simple acinal arrange- 
ment, and present the appearance of modified Brunner’s glands : — 
several tubules opening into a single duct, which in turn opens 
on the surface. The secreting cells lining the tubules have the 
ordinary appearance of columnar epithelium. The supporting 
framework of connective tissue is highly cellular, and here and 
there small masses of lymph follicular tissue are seen. 
* Since the above was read, Professor Sir ¥m. Turner has published an 
account of the stomach of a full-time foetal Narwhal (Jour, of Anat. andPhys., 
vol. xxiii. p. 486, “ On the Stomach of Ziphioid and Delphinoid Whales ”), 
in which he states that “ the duodenum arose from the right and posterior 
aspects of the fifth compartment. It was somewhat dilated at its commence- 
ment, but soon became a cylindriform tube The mucous lining of the 
dilated portion was smooth, that of the cylindriform tube was elevated into 
valvulse conniventes. Close to where the cylindriform part of the duodenum 
began was a semilunar fold of mucous membrane, which bounded the orifice 
of the hepatico-pancreatic duct.” 
