Most of the abdominal organs are suspended from the dorsal wall of the body cavity by delicate membraneous sheets, or _mesenteries_. Similar sheets between the organs are the _omenta_. The stomach is suspended by a _mesogaster_, which extends as a free fold along the body as far as the anterior mesenteric and lienogastric arteries. It encloses these, and is attached to the spleen, pancreas, stomach, and anterior end of the intestine. The spleen is connected with the stomach by the _gastro-splenic omentum_, formed by an extension of the peritoneal coat of the stomach around the spleen. The liver is connected to the loop of the stomach by the _gastro-hepatic omentum_ in which are the hepatic duct, portal vein, and hepatic artery. Near the stomach it is joined by a fold of the peritoneum from the duodenum, the _duodeno-hepatic omentum_, which also unites with the mesogaster. The rectum and rectal gland are supported by a second median mesentery, the _mesorectum_. In Eugaleus the mesentery extends the entire length of the abdominal cavity. It forms a broad sheet attached to the anterior end of the proximal limb of the stomach (mesogaster), to the anterior end of the intestine (mesentery proper), and to the rectum (mesorectum). There is not the reduction of the mesentery which there is in Squalus. The gonads are suspended from the lateral faces of the mesentery above the stomach and intestine. The gastro-hepatic omentum forms a broad sheet between the limbs of the stomach, joining the mesogaster dorsal to the stomach and the mesentery above the intestine. A small division of the right lobe of the liver stands out between the main lobes. In this is located a long, narrow _gall-bladder_. Open the bladder by a longitudinal ventral incision. The opening into the _bile duct_ will be found near the anterior end of the bladder. In Eugaleus, which does not possess such a median lobe, the gall-bladder lies hidden in the right lobe of the liver. It can be opened and explored, but the connection with the duct can usually be demonstrated only by scraping. Do this later. The bile duct passes along the dorsal side of the gall-bladder and the edge of the gastro-hepatic and duodeno-hepatic omenta to the junction of the duodenum and large intestine, where it opens into the alimentary canal. Trace its oblique course through the wall of the intestine. The bile duct and the collecting (hepatic) ducts of the liver will be traced in the liver at a later stage of the dissection. The _pancreas_ consists of two lobes; a slender lobe lying dorsal to and parallel with the stomach, and a flattened oval lobe lying upon the ventral surface of the duodenum, connected with the dorsal lobe by a slender bar of glandular tissue. The _pancreatic duct_ passes from the extreme right end of the duodenal lobe obliquely through the wall of the intestine, opening into the anterior end of the large intestine. Free the edge of the lobe from the peritoneum and follow the duct.