The elasmobranch fishes (1934) The elasmobranch fishes elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 275 canal {lime.) passes backward from the infraorbital to the region of the hyoid arch; and a fourth, the mandibular (wic), traverses the lower jaw. Various modifications of these and their accessory parts will be noted later. The formation of the lateral and cephalic canals may first be briefly de- scribed. The earliest rudiment of the lateral line appears as a flattened plate

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