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Pectostraca :: Pectostraca (n. pl.) A degenerate order of Crustacea, including the Rhizocephala and Cirripedia..

Cirrigrade :: Cirrigrade (a.) Moving or moved by cirri, or hairlike appendages..

Cirripedia :: Cirripedia (n. pl.) An order of Crustacea including the barnacles. When adult, they have a calcareous shell composed of several pieces. From the opening of the shell the animal throws out a group of curved legs, looking like a delicate curl, whence the name of the group. See Anatifa..

Cirri :: Cirri (pl. ) of Cirru.

Cirrostomi :: Cirrostomi (n. pl.) The lowest group of vertebrates; -- so called from the cirri around the mouth; the Leptocardia. See Amphioxus.

Tubicolae :: Tubicolae (n. pl.) A division of annelids including those which construct, and habitually live in, tubes. The head or anterior segments usually bear gills and cirri. Called also Sedentaria, and Capitibranchiata. See Serpula, and Sabella..

Pedunculata :: Pedunculata (n. pl.) A division of Cirripedia, including the stalked or goose barnacles..

Cirrus :: Cirrus (n.) A soft tactile appendage of the mantle of many Mollusca, and of the parapodia of Annelida. Those near the head of annelids are Tentacular cirri; those of the last segment are caudal cirri..

Cirriferous :: Cirriferous (a.) Bearing cirri, as many plants and animals..

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

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..

Cirrobranchiata :: Cirrobranchiata (n. pl.) A division of Mollusca having slender, cirriform appendages near the mouth; the Scaphopoda..

Comatula :: Comatula (n.) A crinoid of the genus Antedon and related genera. When young they are fixed by a stem. When adult they become detached and cling to seaweeds, etc., by their dorsal cirri; -- called also feather stars..

Spirable :: Spiodea (n. pl.) An extensive division of marine Annelida, including those that are without oral tentacles or cirri, and have the gills, when present, mostly arranged along the sides of the body. They generally live in burrows or tubes..

Cirrate :: Cirrate (a.) Having cirri along the margin of a part or organ.

Cirriped :: Cirriped (n.) One of the Cirripedia.

Abdominalia :: Abdominalia (n. pl.) A group of cirripeds having abdominal appendages.

Tergum :: Tergum (n.) One of the dorsal plates of the operculum of a cirriped.

Cirrhiferous :: Cirrhiferous (a.) See Cirriferous.

Articulus :: Articulus (n.) A joint of the cirri of the Crinoidea; a joint or segment of an arthropod appendage.

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