The elasmobranch fishes . elasmobranchfish03dani Year: 1934 214 THE ELASMOBRANCH FISHES propterygium joins the lateral abdominal vein independent of the brachial (Raia erinacea, fig. 194b) . In Raja nasuta two independent brachial branches join the lateral vein. In Heptmichus it was seen that the subscapular vein (, fig. 187) is an important tributary of the lateral abdominal, emptying, in common with the brachial as a brachioscapular vessel, blood from the pectoral girdle and from the lateral cutaneous vessel. In Mustelus kcnlei a short subscapular trunk joins the brachial but all blo
The elasmobranch fishes . elasmobranchfish03dani Year: 1934 214 THE ELASMOBRANCH FISHES propterygium joins the lateral abdominal vein independent of the brachial (Raia erinacea, fig. 194b) . In Raja nasuta two independent brachial branches join the lateral vein. In Heptmichus it was seen that the subscapular vein (, fig. 187) is an important tributary of the lateral abdominal, emptying, in common with the brachial as a brachioscapular vessel, blood from the pectoral girdle and from the lateral cutaneous vessel. In Mustelus kcnlei a short subscapular trunk joins the brachial but all blood from the lateral cutaneous reaches the heart through the postcardinal. Squalus sucklii is of interest as a type which actually bridges these two extremes. In it the lateral abdom- inal {, fig. 197), just before entering the duct of Cuvier, re- ceives the brachioscapular trunk which includes the subscapular vein (). Now the subscapu- lar vein dorsally comes in contact with, and has an opening into, the postcardinal sinus (). The lateral cutaneous vein (Lev.) empties into the subscapular near the union of the subscapular with the postcardinal sinus, so that the blood from the lateral cutaneous Fig. 197. Diagram of relations of postcardinal to lateral abdominal system, Squalus sucTclii. ', brachial vein; , brachioscapular; , coracoid vein; , duct of Cuvier; , lateral abdominal vein; , lateral cutaneous vein; , postcardinal sinus; , subclavian vein; , subscapular. vein after entering the subscapular may pass dorsally into the postcardinal sinus or ventrally into the lateral abdominal vein. In other words, if the sub- scapular vein of Squalus sucklii had no connection with the postcardinal sinus, Squalus would be in all essentials of the type of Heptanchus. If, however, that segment of the subscapular between the entrance of the lateral cutaneous (Lev., fig. 197) and the brachial vein () were dropped out
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