. The elasmobranch fishes . 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 elasmobranch fishes . 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 littoralis), or they may empty independently into the sinus venosus by a half-dozen smaller mouths {Raja rubens). In Raia erinacea numerous vessels receive blood from the large triangular area lying parallel to the posterior margin of the sinus venosus and empty it directly into the sinus venosus. The vessels of Thebesius in the Elasmobranchs, according to Parker and Davis (1899), are deep in the walls of the heart and are connected with the coronary veins. They may be detected by immersing the heart in water and
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