THE CONTROL OF THE DERMAL MELANOPHORES IN ELASMOBRANCH FISHES

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Abstract
The common dogfish, Mustelus canis, has both dark and light phases due to the expansion and contraction of its dermal melanophores. The light phase is induced through the action of contracting nerves, and is not merely the result of the absence of pituitary secretions. The dogfish is the first form to be described in which the cutting of nerves induces a contraction of the melanophores and a consequent lightening of the skin.

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