Pinna
a genus of Aviculidæ; shell sometimes two feet long, equivalve; umbones anterior, posterior side truncated and gaping; hinge, edentulous; animal with a doubly fringed mantle and an elongated grooved foot; shell attached by a strong byssus spun by the animal; sometimes mixed with silk and woven into gloves; known species, recent, 30 from the United States, Great Britain, into gloves; known species, recent, 30 the Mediterranean, Australia, etc.