[f. mod.L. cystis CYST + -ID.]

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  1.  Geol. A member of the order Cystidea or Cystoidea of fossil echinoderms; a cystidean.

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1862.  Dana, Man. Geol., 162. The Cystids are the most anomalous of Radiates.

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1877.  Le Conte, Elem. Geol. (1879), 299. Stemmed Echinoderms or Crinoids, may be divided into three families, viz.: 1. Crinids, 2. Cystids, 3. Blastids.

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  2.  Zool. ‘The sac-like ciliated embryo of some of the Polyzoa’ (Syd. Soc. Lex.).

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1877.  Huxley, Anat. Inv. Anim., viii. 459. From one end of this cystid, one or more polypides are developed from thickenings of the wall of the sac.

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