Trachymedusae

Trachymedusae, an order of Hydrozoa belonging to the class Craspedota (q.v.), including those jelly~fish in which the tentacles are solid, except sometimes in the adult. The adult is produced by a series of metamorphoses from a small free larva, in the form of a small Hydralike animal. It includes two suborders, the Narcomedusae and Trachomedusae.