Glass-robe Sponge

Glass-robe Sponge (Hyalonema), a Japanese flinty sponge (one of the Hxactinellida), the body of which is anchored in the mud or ooze by a spirally twisted wisp or rope of siliceous threads. The latter, stripped of the sponge and manipulated by the Japanese divers, is a common curiosity. See SPONGES.