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Isopoda :: Isopoda (n. pl.) An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure..

Sessile :: Sessile (a.) Attached without any sensible projecting support.

Acorn-shell :: Acorn-shell (n.) One of the sessile cirripeds; a barnacle of the genus Balanus. See Barnacle.

Sertularian :: Sertularian (n.) Any species of Sertularia, or of Sertularidae, a family of hydroids having branched chitinous stems and simple sessile hydrothecae. Also used adjectively..

Cystidea :: Cystidea (n. pl.) An order of Crinoidea, mostly fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were sessile, others had short stems..

Sertularia :: Sertularia (n.) A genus of delicate branching hydroids having small sessile hydrothecae along the sides of the branches.

Sessile-eyed :: Sessile-eyed (a.) Having eyes which are not elevated on a stalk; -- opposed to stalk-eyed.

Spike :: Spike (n.) A kind of flower cluster in which sessile flowers are arranged on an unbranched elongated axis.

Medusoid :: Medusoid (a.) Like a medusa; having the fundamental structure of a medusa, but without a locomotive disk; -- said of the sessile gonophores of hydroids..

Patella :: Patella (n.) A kind of apothecium in lichens, which is orbicular, flat, and sessile, and has a special rim not a part of the thallus..

Gonocalyx :: Gonocalyx (n.) The bell of a sessile gonozooid.

Sessile :: Sessile (a.) Permanently attached; -- said of the gonophores of certain hydroids which never became detached.

Pedicellaria :: Pedicellaria (n.) A peculiar forcepslike organ which occurs in large numbers upon starfishes and echini. Those of starfishes have two movable jaws, or blades, and are usually nearly, or quite, sessile; those of echini usually have three jaws and a pedicel. See Illustration in Appendix..

Sessile :: Sessile (a.) Resting directly upon the main stem or branch, without a petiole or footstalk; as, a sessile leaf or blossom..

Medusoid :: Medusoid (n.) A sessile gonophore. See Illust. under Gonosome.

Barnacle :: Barnacle (n.) Any cirriped crustacean adhering to rocks, floating timber, ships, etc., esp. (a) the sessile species (genus Balanus and allies), and (b) the stalked or goose barnacles (genus Lepas and allies). See Cirripedia, and Goose barnacle..

Stalking-horse :: Stalk-eyed (a.) Having the eyes raised on a stalk, or peduncle; -- opposed to sessile-eyed. Said especially of podophthalmous crustaceans..

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