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A short tubular opening at the top of a retort, or at the top or side of a bottle; a tubulation.

Invested with, or as if with, a sheath; as, a vaginate stem, or one invested by the tubular base of a leaf.

A genus of Infusoria which form minute vaselike or tubular cases in which they dwell.

One of the tubular florets in composite flowers. Henslow.

ot.) Same as Lady's comb. (b) (Zoöl.) A species of Murex (M. tenuispinus). It has a long, tubular canal, with a row of long, slender spines along both of its borders, and rows of similar spines covering the body of the shell. Called also Venus's shell. -- Venus's fan (Zoöl.), a common reticulated, fanshaped gorgonia (…

species of marine Bryozoa belonging to Vesicularia and allied genera. They have delicate tubular cells attached in clusters to slender flexible stems.

One of a system of tubular excretory organs having external openings, found in many invertebrates. They are believed to be analogous in function to the kidneys of vertebrates. See Illust. under Trematodea, and Sporocyst.

rubby plants, and is found to a less extent in herbaceous stems. It consists of elongated tubular or needle-shaped cells of various kinds, usually interwoven with the shinning bands called silver grain.