The elasmobranch fishes . elasmobranchfish03dani Year: 1934 216 THE ELASMOBRANCH FISHES then inflating the left coronary vein with a blow pipe, whereupon bubbles of air emerge from the left atrial wall into the atrium {Acanthias). No bubbles, however, appear upon the inflation of the right coronary vein. The same may Fig. 199a. Veins of, and in the region of, first dorsal fin, Squalus sucTclii. (L. H. Bennett, orig.) c, vein connecting dorsal and lateral cutaneous systems; , vena circularis; , dorsal cutaneous vein; dfv., vein draining dorsal fin. ])e demonstrated in the coronary ar
The elasmobranch fishes . elasmobranchfish03dani Year: 1934 216 THE ELASMOBRANCH FISHES then inflating the left coronary vein with a blow pipe, whereupon bubbles of air emerge from the left atrial wall into the atrium {Acanthias). No bubbles, however, appear upon the inflation of the right coronary vein. The same may Fig. 199a. Veins of, and in the region of, first dorsal fin, Squalus sucTclii. (L. H. Bennett, orig.) c, vein connecting dorsal and lateral cutaneous systems; , vena circularis; , dorsal cutaneous vein; dfv., vein draining dorsal fin. ])e demonstrated in the coronary arteries but with more difficulty. In Raia evinacea by inflating either right or left vein a similar bubbling occurs from the inner surface of the atrium, although none occurs from the ventricle. In the Elasmobranchs, then, the superfi- cial veins of the heart empty into the sinus venosus and the deeper Thebesian vessels enter the atrium direct. CUTANEOUS SYSTEM OF VEINS The cutaneous veins consist of the dor- sal, ventral, and lateral vessels of the skin. The dorsal cutaneous vein collects blood from the skin on the back {Squalus sucklii, fig. 198, ). It ex- tends along the middorsal line from the caudal fin to the endolymjihatic ducts, and surrounds both dorsal fins in closed loops {, fig. 199a). Posterior to the loop surrounding the first dorsal in Mustelns antarcticus according to T. J. Parker (1886) a median vein passes downward to the left of the column to join the left renal portal. This is essen- tially the condition found in Squalus except that this deep vessel arises as a
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