HAG-FISH, BORER or GLUTINOUS HAG (Myxine), one of the Cyclostomata (q.v.). It is elongated in shape and feeds on fish, eating its way into them and devouring everything but the skin, skeleton, and nervous system. It is found in the temperate seas, and is especially abundant on the east coast of Scotland and the coast of California, where it causes considerable damage to the fisheries. It secretes a glutinous substance in large quantities. (See FIsH. )