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