Abstract
IN the subtentacles and marginal bodies of the Mediterranean medusa Rhizostoma pulmo a violet pigment occurs which can be extracted by means of distilled water at 2°–4°. By filtering and evaporating to dryness the deep violet-coloured solution in vacuum, and redissolving it three or four times, we finally obtained an amorphous violet residue, insoluble in common organic solvents, but giving with antimony trichloride in chloroform a blue carotenoid-like reaction. The violet colour is constant between pH 1.4–10.0. Over and below this pH it becomes pink. Addition of hydrogen peroxide decolorizes the solution. The violet solution shows a bluish fluorescence in ultra-violet light, and a characteristic absorption spectrum with three peaks at 6150 A., 5750 A. and 5250 A. (Fig. 1).
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