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Show 356 MR. I'. E. BEDDARD ox T H E [Feb. 16, which arise at fairly equidistant intervals of about an inch. The two lobes of the liver are served by different arteries, all of which spring from a continual longitudinal hepatic artery which runs between the oesophagus and the liver. The exact arrangement of these branches in the case of one artery is shown in the accompanying drawing (text-fig. 71), and the others do not differ greatly. Text-fig. 71. One of the hepatic arteries of Ophiophayus. Ao., aorta ; L.L., branches of hepatic artery to left liver-lobe ; CPS., oesophageal branches; B.L., branches of hepatic artery to right line. The superior mesenteric artery arises a little behind the gallbladder, and divides into the usual two branches-one gastric, the other intestinal. The inferior mesenteric arises just behind the !11iterior spermatic artery. It crosses the anterior kidney ventrally, and gives off a branch to it on the way. After this artery there are 5 intestinal arteries. The next to the inferior mesenteric arises behind the anterior kidney. The four following arteries are somewhat crowded together. In addition to these, some of tire renal arteries give off branches to the intestine. Gastric Arteries.-Six arteries arise from the aorta after the end of the liver and supply the walls of the stomach. Five of these are fairly close together and at the anterior end ; the sixth is much further away, though not quite halfway between the fourth gastric artery and the origin of the gastric branch of the superior mesenteric, which may be regarded as a seventh gastric artery. These arteries combine to form two longitudinal vessels running along the stomach, which practically commence with the first of these arteries, though slender anastomoses exist anteriorly. I call, in fact, that artery the first of the gastric series which begins the longitudinal arteries and has at least no marked branch to the liver. It m a y further-more be pointed out that the six purely gastric arteries pass ventrally of the portal vein, while the gastric branch of the superior mesenteric lies dorsally to that vein. The first two gastric arteries divide into |