n. A generic name applied by Sars to certain Polyps, under a misapprehension; hence, the actinula or fixed embryo of some hydrozoans, as a discophoran, which multiplies agamogenetically by budding, and gives rise to permanent colonies of hydriform polyps; an ephyra. See Scyphomedusæ, and cut under strobila. Also scyphistome, scyphostome.