454 SCHULTE, SEI WHALE. 



region of the hepatic hilum ventral to the portal vein. The ducts of the pancreas were not 

 examined. 



Spleen. The spleen is small and attached closely to the fundus of the first stomach by a 

 duplicature of the peritoneum of the greater sac. It is elongated and narrow, nearly trans- 

 verse in position, its dorsal extremity prolonged to touch the pancreas. To the right it lay in 

 peritoneal contact with the descending colon. The lesser sac failed to reach it. 



Adrenals. The left adrenal is oval, dorso-ventrally flattened, with a feebly convex mesal 

 border, notched a little above its middle. This notch is prolonged as a furrow on the ventral 

 surface where the adrenal vein emerges from it and descends to join the left renal vein. The 

 body rests against the left crus of the diaphragm slightly overlapping the left kidney; its lower 

 pole is in contact with the renal vein as it emerges from the kidney. Along its mesal border 

 it is adherent to the duodenum, the remainder of the ventral surface being covered by perito- 

 neum. The arteries enter its dorsal surface and are three in number, a branch from the aorta, 

 a twig from the renal to its caudal portion, another from the phrenic, rostral to the aortic branch. 

 Its dimensions are: length 10.5 mm.; breadth 6 mm.; thickness 2.5 mm. The right adrenal is 

 more triangular in shape. Resting against the right crus of the diaphragm, it is wedged in 

 between the postcava, the right kidney and the renal vein. ' Ventrally it is covered with peri- 

 toneum save that a strip along the mesal border is adherent to duodenum and at the upper pole 

 to the liver. The adrenal vein enters the postcava. The right adrenal is of about the same size 

 as the left but of slightly different proportions. Its length is 9 mm., its breadth 6, its thickness 

 3 mm. 



Peritoneum. It has been seen that the intestines have undergone a typical complete rota- 

 tion to the left beneath the arch of the colon, a condition which Weber l has found to be 

 characteristic of the Mysticete in contrast to the Odontocete. He has also pointed out the 

 non-development or rudimentary condition of the transverse colon, which he is inclined to find 

 represented by the arch between the oblique ascending and the descending colon. It would 

 appear preferable however in the light of other investigations, 2 especially those dealing with the 

 development of the alimentary canal to interpret this arch of the colon as the splenic flexure, 

 for this is present at a period long antecedent to the differentiation of a transverse colon and 

 is one of the fixed and almost invariable landmarks of the intestinal tract. It represents the 

 apex of the third of the fundamental intestinal loops, the left colic of Bardeen, and at the comple- 

 tion of rotation, or even when it fails to occur, regularly swings to the left and becomes fixed 

 below the spleen. The remainder of the colon at this period occupies an oblique position along 

 the under surface of the right lobe of the liver, and only with the secondary growth of the abdo- 

 men and the diminution of the bulk of the liver, gains space for the development of an hepatic 

 flexure, which establishes the limits of the ascending and transverse colon, these differentiating 

 out of the early oblique colon limb rather than by growth of the splenic flexure. Apart from 

 this point of interpretation, the general arrangement of the bowel conforms closely to the descrip- 

 tion of Hunter 3 and the more detailed study of Weber. 4 As the ileo-colic junction faces to the 



1 Weber, Max. Studien tiber Saugethiere. II. Jena, 1886. Die Saugethiere. Jena, 1904. 



2 Huntington, Geo. S. Studies in the development of the alimentary canal. Report of the Lying-in-Hospital of the City of New 

 York. 1893. The anatomy of the human peritoneum and abdominal cavity. Philadelphia and New York. 1903. Bardeen, C. R. 

 The critical period in the development of the intestines. Am. Jour. Anat., Vol. 16, No. 4, 1914. 



3 Hunter, John., op. oil. 

 * Weber, Max., op. cit. 



