Definitions

from The Century Dictionary.

  • Regular sea-urchins, with biserial ambulacral plates, centric mouth, and aboral anus interior. Also called Endocyclica.

from the GNU version of the Collaborative International Dictionary of English.

  • noun plural (Zoöl.) A division of Echini which includes the circular, or regular, sea urchins.

Etymologies

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Examples

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