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.
Found on http://thinkexist.com/dictionary/meaning/cystidea/

Cystidea

Cys·tid'e·a noun plural [ New Latin , from Greek ............ a bladder, pouch.] (Zoology) 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.
Found on http://www.encyclo.co.uk/webster/C/211
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