. The elasmobranch fishes. Chondrichthyes. 212 THE ELASMOBRANCH FISHES sinuses. Where the two vessels fuse together the walls between the two sides are more or less broken down and the remaining walls are supported by trabeculae. These hepatic sinuses may empty by relatively small apertures near the middle line into the sinus venosus (Scyllium). In certain types the hepatic veins enter the outer tips of the duet of Cuvier (Torpedo, Raja). DEVELOPMENT OF HEPATIC POETAL SYSTEM In the embryo, the vitelline veins from the yolk sac (, fig. 195) are among the first vessels to appear. These are f

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. The elasmobranch fishes. Chondrichthyes. 212 THE ELASMOBRANCH FISHES sinuses. Where the two vessels fuse together the walls between the two sides are more or less broken down and the remaining walls are supported by trabeculae. These hepatic sinuses may empty by relatively small apertures near the middle line into the sinus venosus (Scyllium). In certain types the hepatic veins enter the outer tips of the duet of Cuvier (Torpedo, Raja). DEVELOPMENT OF HEPATIC POETAL SYSTEM In the embryo, the vitelline veins from the yolk sac (, fig. 195) are among the first vessels to appear. These are followed by the subintestinal vein (), previously mentioned, which unites with the vitelline to form an omphalo- ^ i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Daniel, J. Frank (John Franklin), 1873-1942. Berkeley,Calif. , University of California press

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