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Show 1904.] ANATOMY OF THE LAOERTILIA, 439 have seen this vessel throughout its whole course only on the right side of one specimen. Iii this specimen the vein bifurcates at about the middle of the liver, and the one branch joins the first of the ventral hepato-parietals; the other branch is prolonged forwards and joins the brachial vein. Lettered Abdominal veins.-These veins in Iguana are short, and perhaps this condition is to be correlated with the conspicuous development of the lateral epigastrics *". Each springs close to the root of the anterior abdominal on either side in company with two small parietal veins (text-fig. 88). I could trace them forwards only as far as the level of the suprarenal bodies, where they become continuous with the veins of the same. Azygos vein.-Anteriorly the azygos vein is exposed on the left side for a space of three or four vertebra?. I traced it beneath the subclavian artery and as far as the third following intercostal artery. On the right side the vein disappeared from view at the level of the origin of the right subclavian. Two specimens were alike. The gastro-intestinal branches of the Portal vein are either four or five and they are as follows:-Posterior to the opening of the Text-fig. 89. Alimentary portal system of Iguana tuberculata. Ant.Abd., anterior abdominal vein ; G., gastric veins; G.Hep., gnstro-hepatir ; Li., trunk from large intestine; Si., branches from small intestine; Spl., splenic vein; P., pancreatic vein. anterior abdominal vein is a branch supplying the stomach and pancreas ; this follows the curvature of the stomach, and is connected anteriorly with the last of the gastro-hepatic veins. Then follows another gastric vein which draws blood from the opposite side of the stomach; in the second individual this vein joins the first k * According to Hochstetter this vein is absent in Uromaslix. |