Cys*tid"e*a (s?s-t?d"?-?), n. pl. [NL., fr. Gr. a bladder, pouch.] Zool.

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.

 

© Webster 1913.

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