. Animal biology. Zoology; Biology. 340 METAZOAN PHYLA The circulation of the dogfish is typical of fishes generally (Fig. 229). The blood passes from the ventricle forward in a ventral aorta and by afferent branchial arteries to a capillary network in the gills, where it is oxygenated and where the carbon dioxide is given off. It is collected again by efferent branchial arteries which carry it to the dorsal aorta, Olfactory bulb Olfactory tract. Medulla Fig. 230. —Brain of a European dogfish shark, Scyllium canicula Cuvier. Dorsal view. {From a Zieglcr model, after Wiedersheim.) The roots of
. Animal biology. Zoology; Biology. 340 METAZOAN PHYLA The circulation of the dogfish is typical of fishes generally (Fig. 229). The blood passes from the ventricle forward in a ventral aorta and by afferent branchial arteries to a capillary network in the gills, where it is oxygenated and where the carbon dioxide is given off. It is collected again by efferent branchial arteries which carry it to the dorsal aorta, Olfactory bulb Olfactory tract. Medulla Fig. 230. —Brain of a European dogfish shark, Scyllium canicula Cuvier. Dorsal view. {From a Zieglcr model, after Wiedersheim.) The roots of the cranial nerves are marked by roman numerals. by which, in turn, it is distributed throughout the body. Returning from the peripheral vessels by the veins the blood is carried back to the heart, that from the tail passing through a renal-portal system in the kidney, that from the ahmentary tract through a hepatic-portal system in the liver. A portal system is a capillary system interposed in the course of a vein. All of the venous blood is received by the sinus venosus, from which it passes into the auricle, or atrium, and then into the veiv-. 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 Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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