. The elasmobranch fishes . Fig. 16. Carcharias gJaucus. (From Garman.) of prey, the head is pointed, and the rounded body tapers gracefully into a powerful organ of locomotion, the caudal fin; while in ZJrolophus, which spends much of its time on the bottom, the head and body are depressed, carry- ing the branchial clefts to a ventral position, and the pectoral fins, extending

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