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Siphonostomata :: Siphonostomata (n. pl.) A tribe of parasitic copepod Crustacea including a large number of species that are parasites of fishes, as the lerneans. They have a mouth adapted to suck blood..

Nectostem :: Nectostem (n.) That portion of the axis which bears the nectocalyces in the Siphonophora.

Siphon :: Siphon (n.) A device, consisting of a pipe or tube bent so as to form two branches or legs of unequal length, by which a liquid can be transferred to a lower level, as from one vessel to another, over an intermediate elevation, by the action of the pressure of the atmosphere in forcing the liquid up the shorter branch of the pipe immersed in it, while the continued excess of weight of the liquid in the longer branch (when once filled) causes a continuous flow. The flow takes place only when the

Siphoniata :: Siphoniata (n. pl.) Same as Siphonata.

Siphon :: Siphon (n.) The siphuncle of a cephalopod shell.

Asiphonata :: Asiphonata (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..

Asiphonate :: Asiphonate (n.) An asiphonate mollusk.

Taster :: Taster (n.) One of a peculiar kind of zooids situated on the polyp-stem of certain Siphonophora. They somewhat resemble the feeding zooids, but are destitute of mouths. See Siphonophora..

Physograde :: Physograde (n.) Any siphonophore which has an air sac for a float, as the Physalia..

Siphonia :: Siphonia (n.) A former name for a euphorbiaceous genus (Hevea) of South American trees, the principal source of caoutchouc..

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..

Nectocalyx :: Nectocalyx (n.) One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ..

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

Caoutchouc :: Caoutchouc (n.) A tenacious, elastic, gummy substance obtained from the milky sap of several plants of tropical South America (esp. the euphorbiaceous tree Siphonia elastica or Hevea caoutchouc), Asia, and Africa. Being impermeable to liquids and gases, and not readly affected by exposure to air, acids, and alkalies, it is used, especially when vulcanized, for many purposes in the arts and in manufactures. Also called India rubber (because it was first brought from India, and was formerly used c

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.

Porpita :: Porpita (n.) A genus of bright-colored Siphonophora found floating in the warmer parts of the ocean. The individuals are round and disk-shaped, with a large zooid in the center of the under side, surrounded by smaller nutritive and reproductive zooids, and by slender dactylozooids near the margin. The disk contains a central float, or pneumatocyst..

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

Siphonophoran :: Siphonophoran (a.) Belonging to the Siphonophora.

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