OCR Text |
Show 186 MR. W. A. FORBES ON THE KOALA. [Jan. 18, The bile- and pancreatic ducts open into the duodenum 2J inches from the pylorus. The pancreatic duct is dilated terminally into a vesicle, which does not receive the bile-duct, the latter opening alongside the former into the intestine. Liver of Koala, from above; three fifths the natural size. though small, are quite distinct. The livers of Belideus sciureus and B. brevi-ceps, Acrobatapygmcea, and Dromicia (nana?), though differing among themselves considerably in the relative degree of development of their constituent lobes, all agree in having a distinct and free caudate lobe, as well as a Spigelian, and in no system of secondary sulci attaining any degree of development. In Phascolomys wombat the left lateral lobe is the largest; the right central is also large ; but the left central is very small, as is the right lateral fissure. T h e umbilical fissure is distinct, as is the cystic fissure, which allows the gallbladder, which reacheB to the anterior margin of the liver, to appear superficially. There are no distinct caudate or Spigelian lobes, though the former is indicated. There is a tendency, particularly on the left lateral and right central lobes, to develop accessory sulci. As in the Koala, too, the small right lateral lobe is pointed below. |