Thecaphora

Thecaphora, the Zoophytes of the sub-order of Hydroida (q.v.), in which the zooids or individuals of the colony are protected by cups or thecae. The best-known families in it are the Campanularidae, Sertulariidae, and Plumulariidae, which include many of the best-known of our English Sea-firs. The group is whol1y marine; the fossil forms assigned to it are of little interest.