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From The Collaborative International Dictionary of English v.0.48:
Phoronis \Pho*ro"nis\, n. [NL., fr. L. Phoronis, a surname of Io, Gr. ?.] (Zool.) 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. [1913 Webster]