. The elasmobranch fishes. Chondrichthyes. 184 THE ELASMOBRANCPI FISHES sucliii, fig. 172a). In certain forms they may extend forward in a number of strands {Cetorhinus, fig. 172b). The posterior cerebrals in Squalus (, fig. 172a) loop around the inferior lobes of the brain and fuse into a single strand. By the union of right and left posterior cerebrals behind and the anterior cere- bral in front a circle of Willis is formed somewhat like that in man. Further-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - color
. The elasmobranch fishes. Chondrichthyes. 184 THE ELASMOBRANCPI FISHES sucliii, fig. 172a). In certain forms they may extend forward in a number of strands {Cetorhinus, fig. 172b). The posterior cerebrals in Squalus (, fig. 172a) loop around the inferior lobes of the brain and fuse into a single strand. By the union of right and left posterior cerebrals behind and the anterior cere- bral in front a circle of Willis is formed somewhat like that in man. Further-. 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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