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Updated: May 20, 2025
Investigations had been made on the Hydroid stock, described as Coryne, and upon its Medusoid offspring, described as Sarsia, named after the naturalist Sars, whose beautiful papers upon this class of animals have associated his name with it; but the investigations by which all these facts have been associated in one connected series are very recent.
Mysterious destiny! yet not so mysterious as that of the free medusoid young of every polype and coral, which ends as a rooted tree of horn or stone, and seems to the eye of sensuous fancy to have literally degenerated into a vegetable. Of them you must read for yourself in Mr. Gosse's book; in the meanwhile he shall tell you something of the beautiful Madrepores themselves.
Furnished with these facts, it is not difficult to recognize true beroidal forms in the embryos of sea-urchins and star-fishes, published by Muller in his beautiful plates, and thus to trace the medusoid origin of the echinoderms, as the polypoid origin of the medusae has already been recognized.
At the right moment this film is torn open by the convulsive contractions of the animal, which, thus freed from its envelope, begins at once to expand. By this time this little bud has assumed the form of a Medusoid or Jelly-Fish disk, with its four tubes radiating from the central cavity.
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