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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..

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

Medusae :: Medusae (pl. ) of Medus.

Scapulet :: Scapulet (n.) A secondary mouth fold developed at the base of each of the armlike lobes of the manubrium of many rhizostome medusae. See Illustration in Appendix.

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

Hydromedusae :: Hydromedusae (pl. ) of Hydromedus.

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..

Velarium :: Velarium (n.) The marginal membrane of certain medusae belonging to the Discophora.

Taeniola :: Taeniola (n.) One of the radial partitions which separate the internal cavities of certain 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..

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

Pulmograde :: Pulmograde (a.) Swimming by the expansion and contraction, or lunglike movement, of the body, or of the disk, as do the medusae..

Craspedota :: Craspedota (n. pl.) The hydroid or naked-eyed medusae. See Hydroidea.

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..

Hydromedusa :: Hydromedusa (n.) Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusae..

Vesiculata :: Vesiculata (n. pl.) The campanularian medusae.

Ciliograde :: Ciliograde (a.) Moving by means of cilia, or cilialike organs; as, the ciliograde Medusae..

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..

Lithocyst :: Lithocyst (n.) A sac containing small, calcareous concretions (otoliths). They are found in many Medusae, and other invertebrates, and are supposed to be auditory organs..

Tentaculocyst :: Tentaculocyst (n.) One of the auditory organs of certain medusae; -- called also auditory tentacle.

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