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Medusoid :: Medusoid (a.) Like a medusa; having the fundamental structure of a medusa, but without a locomotive disk; -- said of the sessile gonophores of hydroids..

Medusa :: Medusa (n.) The Gorgon; or one of the Gorgons whose hair was changed into serpents, after which all who looked upon her were turned into stone..

Velum :: Velum (n.) The circular membrane that partially incloses the space beneath the umbrella of hydroid medusae.

Medusae :: Medusae (pl. ) of Medus.

Rhopalium :: Rhopalium (n.) One of the marginal sensory bodies of medusae belonging to the Discophora.

Manubrium :: Manubrium (n.) The proboscis of a jellyfish; -- called also hypostoma. See Illust. of Hydromedusa.

Polypomedusae :: Polypomedusae (n. pl.) Same as Hydrozoa.

Rhizostomata :: Rhizostomata (n. pl.) A suborder of Medusae which includes very large species without marginal tentacles, but having large mouth lobes closely united at the edges. See Illust. in Appendix..

Jellyfish :: "Jellyfish (n.) Any one of the acalephs, esp. one of the larger species, having a jellylike appearance. See Medusa..

Trachymedusae :: Trachymedusae (n. pl.) A division of acalephs in which the development is direct from the eggs, without a hydroid stage. Some of the species are parasitic on other medusae..

Gymnophthalmata :: Gymnophthalmata (n. pl.) A group of acalephs, including the naked-eyed medusae; the hydromedusae. Most of them are known to be the free-swimming progeny (gonophores) of hydroids..

Meconidium :: Meconidium (n.) A kind of gonophore produced by hydroids of the genus Gonothyraea. It has tentacles, and otherwise resembles a free medusa, but remains attached by a pedicel..

Medusa :: Medusa (n.) Any free swimming acaleph; a jellyfish.

Acalephae :: Acalephae (n. pl.) A group of Coelenterata, including the Medusae or jellyfishes, and hydroids; -- so called from the stinging power they possess. Sometimes called sea nettles..

Strobila :: Strobila (n.) A form of the larva of certain Discophora in a state of development succeeding the scyphistoma. The body of the strobila becomes elongated, and subdivides transversely into a series of lobate segments which eventually become ephyrae, or young medusae..

Hydranth :: Hydranth (n.) One of the nutritive zooids of a hydroid colony. Also applied to the proboscis or manubrium of a hydroid medusa. See Illust. of Hydroidea.

Ephyra :: Ephyra (n.) A stage in the development of discophorous medusae, when they first begin to swim about after being detached from the strobila. See Strobila..

Semaeostomata :: Semaeostomata (n. pl.) A division of Discophora having large free mouth lobes. It includes Aurelia, and Pelagia. Called also Semeostoma. See Illustr. under Discophora, and Medusa..

Sea Jelly :: Sea jelly () A medusa, or jellyfish..

Quarl :: Quarl (n.) A medusa, or jellyfish..

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