Webster’s Revised Unabridged Dictionary · 1913
Phoronis
Pho·ro′nis (fō·rō′nĭs), n. [NL., fr. L. Phoronis, a surname of Io, Gr. Φορωνίς.] (Zoöl.) 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.