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From: Webster's Revised Unabridged Dictionary (1913)

 Ve·lel·la n.  Zool. Any species of oceanic Siphonophora belonging to the genus Velella.
 Note: ☞ These creatures are brilliantly colored and float at the surface of the sea. They have an oblong, disklike body, supported by a thin chitinous plate, from which rises a thin diagonal crest which acts as a sail. The feeding and reproductive zooids hang down from the under side of the disk.
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