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CIDE DICTIONARY

spatangoidea

CIDE DICTIONARY

spatangoidean. pl. [NL. See Spatangus, and -oid.].
     An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side.  [1913 Webster]

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