Definitions

from The Century Dictionary and Cyclopedia

  • n. An order of Euechinoidea or sea-urchins, having an actinal central peristome and an abactinal periproct situated within the dorsocentral system, internal and external branchiƦ, jaws and teeth and a continuous perignathic girdle, and ambulacral plates continued beyond the peristome or as separate buccal plates.

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