Histochemical analyses of the fluid and the solid state of the adhesive materials produced by the pre- and postmetamorphosed Cyprids of Balanus eburneus Gould

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Two distinct eosinophilic zones of granules found in the larval (cyprid) cement gland of Balanus eburneus Gould are referred to as medial and inner granules, according to their morphological position within the gland.No such differentiation of the secretory materials are present in the adult cement cells.Histochemical tests show that the granules, which represent the fluid state of the cement material, in the cyprid and adult, are basic protein, characterized as collagenous substances.The hardened cement produced by the cyprid and the adult that is found on the basal plate are histochemically unreactive protein masses, but the two substances are not histochemically identical.