Spat`an*goi"de*a (?), n. pl. [NL. See Spatangus, and -oid.] Zool.

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.

 

© Webster 1913.

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