The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 213 (, fig. 195c) by the liopatic veins (), which were previously the anterior ends of the vitelline veins. In figure 195c and d the cardinal and renal systems are also well developed. LATERAL ABDOMINAL SYSTEM OF VEINS The lateral abdominal veins {, fig. 194) extend from the pelvic to the pectoral segments of the body just under the peritoneimi in the sides of the body wall. Posteriorly each vein may arise from a net of fine veinlets on the side of the rectal and cloa
The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 213 (, fig. 195c) by the liopatic veins (), which were previously the anterior ends of the vitelline veins. In figure 195c and d the cardinal and renal systems are also well developed. LATERAL ABDOMINAL SYSTEM OF VEINS The lateral abdominal veins {, fig. 194) extend from the pelvic to the pectoral segments of the body just under the peritoneimi in the sides of the body wall. Posteriorly each vein may arise from a net of fine veinlets on the side of the rectal and cloacal walls {Raja,&g. 194b) ; or right and left veins may be continuous across the pelvic cartilage {Mustelus antarcticus, fig. 194a; Scyllium canicula). Posteriorly a rectal branch joins the lateral abdomi- nal of Scyllium near the midven- tral line. The first important trib- utary (or tributaries) to the lat- eral abdominal system of veins is the iliac, resulting from a fusion of the cloacal and femoral veins from the cloacal and pelvic areas, respectively {Mustelus, fig. 194a) . In certain forms the cloacal and femoral veins join the lateral abdominal independently, as in Heptanchus. In Raja an acces- sory femoral vein also empties into the lateral abdominal (fig. 194b). The femoral veins () are formed in the pelvic fin from numerous veinlets, while the cloa- cal veins () drain the sides of the cloacal region. Blood collected from the deeper structures in the posterior region, then, whether from the cloaca or the pelvic fin, is carried forward by the lateral abdominal vessel. As this vessel passes anteriorly many veins from the body wall enter it. At the pectoral girdle the lateral abdominal vein receives important tribu- taries. The first of these is the brachial vein. In the sharks the brachial arises from the union of a dorsal, a median pterygial {, fig. 196), and a lateral pterygial vein {) of the fin. In rays where the pectoral fin is large in extent,
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