monactinellinæ

Century Dictionary and Cyclopedia

1. n. A group, subordinal or other, of fibrosilicious or ceratosilicoid sponges, having comparatively little ceratode, the skeleton being mostly composed of single straight silicious spicules, whence the name. The breadcrumb sponge, Halichondria panicea, is a characteristic example. See Monaxonida.