- A group of soft-bodied Alcyonaria, of which Alcyonium is the type. See Illust. under alcyonaria.
- An order or suborder of Alcyonaria where skeleton is composed of free spicules embedded in a well-developed canaliferous cœnenchyma without axial skeletal pole. The group provides the people Xeniidæ, Alcyonidæ, and Nephthyidæ. Nearly comparable to Alcyoniaceæ.
- comprising the soft corals