资料来源 : Webster's Revised Unabridged Dictionary (1913)

Velella \Ve*lel"la\, n. [NL., dim. from L. velum a veil, a
   sail.] (Zo["o]l.)
   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.