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An artificial division of gastropods including those that have siphonostomatous shells.

f the aperture of the shell prolonged in the shape of a channel for the protection of the siphon; -- said of certain gastropods.

Any parasitic entomostracan of the tribe Siphonostomata.

Destitute of a siphon or breathing tube; -- said of many bivalve shells. -- n.

A group of bivalve mollusks destitute of siphons, as the oyster; the asiphonate mollusks.

The siphon of a phragmocone.

A minute tube found in the protocon

An arrangement of siphon tubes for assisting circulation in a liquid.

The part which in some Siphonophora bears the male gonophores.

table mercurial barometer with tripod support, and long scale, for measuring heights. -- Siphon barometer, a barometer having a tube bent like a hook with the longer leg closed at the top. The height of the mercury in the longer leg shows the pressure of the atmosphere. -- Wheel barometer, a barometer with recurved t…

level or drainage gallery which has a vertical shaft at each end, and acts as an inverted siphon. Knight. -- Blind nettle (Bot.), dead nettle. See Dead nettle, under Dead. -- Blind shell (Gunnery), a shell containing no charge, or one that does not explode. -- Blind side, the side which is most easily assailed; a we…

. There are many species. They have a sack of inklike fluid which they discharge from the siphon tube, when pursued or alarmed, in order to confuse their enemies. Their shell is a thin horny plate, within the flesh of back, shaped very much like a quill pen. In America they are called squids. See Squid.…

m 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 ar…

A siphon, or bent pipe, for drawing liquors out of a cask.

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

One of the free-swimming sexual zooids of Siphonophora.

A Brazilian apocynaceous vine (Macrosiphonia longiflora) having woolly leaves.

ers of ocean steamers. -- Sea gauge, an instrument for finding the depth of the sea. -- Siphon gauge, a glass siphon tube, partly filled with mercury, -- used to indicate pressure, as of steam, or the degree of rarefaction produced in the receiver of an air pump or other vacuum; a manometer. -- Sliding gauge. (Mach.…

One of the branches bearing the female gonophores, in certain Siphonophora.

One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora.