. The elasmobranch fishes . U"^ "^ Fig. 29. Section of the integument of the Leopard shark, Triakis semifasciatus. , basal membrane; , dermal papilla; €.0., enamel organ; , goblet or gland cell; gr., basal or germinative layer of epidermis; , lateral line canal; n., ramulus of vagus nerve; pg., pigment; , sensory column.

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