A peculiar larval kind of Phoronis a genus of marine worms having a circle of ciliated tentacles
- A peculiar larval form of Phoronis, a genus of marine worms, having a group of ciliated tentacles.
(n. pl.) A peculiar larval type of Phoronis, a genus of marine worms, having a circle of ciliated tentacles.
On quitting the shelter of the parent tentacles the embryo becomes a pelagic larva, known as Actinotrocha (fig.