from the GNU version of the Collaborative International Dictionary of English

  • A division of Crinoidea including numerous fossil species in which the body is covered with tessellated plates.

from The Century Dictionary and Cyclopedia

  • A group of tessellate Paleozoic sea-urchins, synonymous with Palæchinoidea.
  • Tessellated crinoids; an order of Crinoidea, having the calyx formed entirely of calcareous plates, and the oral surface without ambulacral furrows, as in the genera Actinocrinus and Cyathocrinus.


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