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Somatocyst :: Somatocyst (n.) A cavity in the primary nectocalyx of certain Siphonophora. See Illust. under Nectocalyx.

Siphonostomata :: Siphonostomata (n. pl.) An artificial division of gastropods including those that have siphonostomatous shells.

Parasita :: Parasita (n. pl.) A division of copepod Crustacea, having a sucking mouth, as the lerneans. They are mostly parasites on fishes. Called also Siphonostomata..

Hydrozoa :: Hydrozoa (n. pl.) The Acalephae; one of the classes of coelenterates, including the Hydroidea, Discophora, and Siphonophora..

Siphonia :: Siphonia (pl. ) of Siphoniu.

Velella :: Velella (n.) Any species of oceanic Siphonophora belonging to the genus Velella.

Asiphonea :: Asiphonea (n. pl.) Alt. of Asiphonid.

Physalia :: Physalia (n.) A genus of large oceanic Siphonophora which includes the Portuguese man-of-war.

Dactylozooid :: Dactylozooid (n.) A kind of zooid of Siphonophora which has an elongated or even vermiform body, with one tentacle, but no mouth. See Siphonophora..

Hydrophyllium :: Hydrophyllium (n.) One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora..

Siphonostomatous :: Siphonostomatous (a.) Having the front edge of the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; -- said of certain gastropods.

Siphonage :: Siphonage (n.) The action of a siphon.

Siphonostome :: Siphonostome (n.) A siphonostomatous shell.

Siphonophora :: Siphonophora (n. pl.) An order of pelagic Hydrozoa including species which form complex free-swimming communities composed of numerous zooids of various kinds, some of which act as floats or as swimming organs, others as feeding or nutritive zooids, and others as reproductive zooids. See Illust. under Physallia, and Porpita..

Siphonopoda :: Siphonopoda (n. pl.) A division of Scaphopoda including those in which the foot terminates in a circular disk.

Siphonophore :: Siphonophore (n.) One of the Siphonophora.

Siphonet :: Siphonet (n.) One of the two dorsal tubular organs on the hinder part of the abdomen of aphids. They give exit to the honeydew. See Illust. under Aphis.

Siphonal :: Siphonal (a.) Of or pertaining to a siphon; resembling a siphon.

Phragmosiphon :: Phragmosiphon (n.) The siphon of a phragmocone.

Diphyozooid :: Diphyozooid (n.) One of the free-swimming sexual zooids of Siphonophora.

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