. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 134 DIETRICH C. SMITH AND MARGARET T. SMITH traction and in the denervated trunk an expansion of the erythrophores. This curious reversal of the responses to heat and cold on the part of certain chromatophores after denervation has previously been noted in connection with the melanophores of FnnJulus heteroclitus (Smith, 1928). Such reversals are not apparently the rule among fishes as at- tempts on other occasions to evoke the same response in the chromato- phores of other forms (Phoxinus hevis, Scorpcena ustulata, Trigla s
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 134 DIETRICH C. SMITH AND MARGARET T. SMITH traction and in the denervated trunk an expansion of the erythrophores. This curious reversal of the responses to heat and cold on the part of certain chromatophores after denervation has previously been noted in connection with the melanophores of FnnJulus heteroclitus (Smith, 1928). Such reversals are not apparently the rule among fishes as at- tempts on other occasions to evoke the same response in the chromato- phores of other forms (Phoxinus hevis, Scorpcena ustulata, Trigla sp.) have been unsuccessful, the direction of the response of the chromato- phores of these fishes to temperature changes remaining the same whether denervated or innervated. This was also true with another lU-rmudian form, the surgeon fish, Acantlmnts he put us. The extent to which this peculiarity characteristic of the chromatophores of Fitu- dulus and Holocentrus is spread among other fishes should be a matter worth investigating FIG. 2. Pulsating erythrophores in the contracted phase in N/10 NaCl. The scales of the squirrel fish upon microscopical examination proved to be favorable objects for direct observations upon the activity of the chromatophores. Three types were present, erythrophores, xantho- phores, and melanophores. the erythrophores being the most numerous with an even distribution throughout the pigmented area of the scale. while the xanthophores, less abundant than the erythrophores, were largely confined to the distal corners. The melanophores were rela- tively scarce and were more or less irregularly scattered throughout the In sea water isolated scales showed chromatophores in the semi- expanded condition, that is with only the proximal one-third or less of the processes of the cell filled with pigment. In N/10 NaCl, however. the pigment distribution was no longer a static affair, the erythrophores and the xanthophores instead alternating
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