Source : Webster's Revised Unabridged Dictionary (1913)

Actinotrocha \Ac`ti*not"ro*cha\, n. pl. [NL.; Gr. ?, ?, a ray +
   ? a ring.] (Zo["o]l.)
   A peculiar larval form of {Phoronis}, a genus of marine
   worms, having a circle of ciliated tentacles.

Phoronis \Pho*ro"nis\, n. [NL., fr. L. Phoronis, a surname of
   Io, Gr. ?.] (Zo["o]l.)
   A remarkable genus of marine worms having tentacles around
   the mouth. It is usually classed with the gephyreans. Its
   larva ({Actinotrocha}) undergoes a peculiar metamorphosis.