资料来源 : Webster's Revised Unabridged Dictionary (1913)

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