from The Century Dictionary.
- An order of fossil crinoids: synonymous with Cystoidea (which see).
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) 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.
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