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Every sea-pen is glorious in its light, in fact, nearly every eight-armed Alcyonarian is thus resplendent, and the social Pyrosoma, bulky and a free swimmer, glows like a bar of hot metal with a white and green radiance." Such accounts are enough to indicate how varied and how general a phenomenon is the phosphorescence of the sea.
The Actinozoa have already been described as formed on the type of the sea-anemone and the coral polyp, that is, they are all animals with a radiate structure, attached to one end, and having their only opening at the other end, which is surrounded by tentacles. In the Alcyonarian forms belonging to this great group these tentacles are always eight in number, and fringed on both sides.
Among mollusks and zoophytes, I found in our trawl's meshes various species of alcyonarian coral, sea urchins, hammer shells, spurred-star shells, wentletrap snails, horn shells, glass snails.
In the first group: organ-pipe coral, gorgonian coral arranged into fan shapes, soft sponges from Syria, isis coral from the Molucca Islands, sea-pen coral, wonderful coral of the genus Virgularia from the waters of Norway, various coral of the genus Umbellularia, alcyonarian coral, then a whole series of those madrepores that my mentor Professor Milne-Edwards has so shrewdly classified into divisions and among which I noted the wonderful genus Flabellina as well as the genus Oculina from Réunion Island, plus a "Neptune's chariot" from the Caribbean Sea every superb variety of coral, and in short, every species of these unusual polyparies that congregate to form entire islands that will one day turn into continents.
He then found, as he did in the great majority of cases which he studied, that the phosphorescence was confined to the motor muscles, and was manifested solely when these were in the act of contracting, manifested, too, not in continuous lines along the course of the muscles, but in rows of brilliant points. More interesting than the Annelids, however, are the Alcyonarian Actinozoa.
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