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It is spontaneous, for example, in the Pelagia phosphorea, but not in the allied Pelagia noctiluca, a very common form in the Mediterranean. In both of the jelly-fishes just mentioned the phosphorescence, when displayed at all, is on the surface of the swimming disk, and this is most commonly the case with the whole group. Sometimes, however, the phosphorescence is specially localized.
The lower portion of it is fixed in the muddy bottom of the sea, but the upper portion is free, and gives off a number of branches, on which the individual polyps are seated. The whole colony thus has the appearance of a highly ornamental pen. There is one British species, Pennatula phosphorea, which is found in tolerably deep water, and is from two to four inches in length.
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