. The elasmobranch fishes . 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
. The elasmobranch fishes . 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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