The elasmobranch fishes . elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 215 ventral vessel. Anteriorly, in the embryonic amphibian, it enters tlie duct of Cuvier, but later, by secondary twigs, it comes to empty directly into the liver. From these characteristics it appears likely that the ventral abdominal in Amphibia is homologous with the lateral abdominal of Elasmobranchs. VEINS or HEART Three sets of vessels return blood, distributed ])y the coronary arteries, from the heart itself. These are a small right coronary, a median cardiac vein, and a larger left coronar}- vein. The
The elasmobranch fishes . elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 215 ventral vessel. Anteriorly, in the embryonic amphibian, it enters tlie duct of Cuvier, but later, by secondary twigs, it comes to empty directly into the liver. From these characteristics it appears likely that the ventral abdominal in Amphibia is homologous with the lateral abdominal of Elasmobranchs. VEINS or HEART Three sets of vessels return blood, distributed ])y the coronary arteries, from the heart itself. These are a small right coronary, a median cardiac vein, and a larger left coronar}- vein. These veins enter the sinus venosus, near the sinu- auricular opening, usually bj^ two or more apertures. The right and left systems in Acanthias, however, join and empty into the sinus venosus by a single large aperture. Fig. 198. Cutaneous system of veins, Squalus sucTclU. (Helen Hopkins, orig.) , caudal vein; ?. and }, superior and inferior lateral cutaneous veins; ', median vein; , posteardinal vein; , posterior dorsal cutaneous vein ; , posterior ventral cutaneous; , subscapular vein. The right coronary may drain the right side of the ventricle and the dorsal side of the conus {Carcharias litforalis), emptying into the sinus venosus by its own aperture at the right side of the sinu-auricular opening; or the right may arise as two vessels on the dorsal and ventral sides of the conus and on the ventral side of the ventricle. These two continue separately and open inde- pendently {Raia erinacea). The left coronary in Raia erinacea is of consider- able size and drains the ventral and lateral parts of the ventricle. In other forms it is a vessel of importance {Carcharias littoralis, Cetorhi^ius, Scyl- lium), draining the ventral and lateral parts of the ventricle. The cardiac veins drain the dorsal part of the ventricular wall. They may form as a double vessel and unite to enter the sinus venosus with the left coronarj^ {Carcharias littoral
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