Larus hyperboreus -- Glaucous Gull; Gaviota blanca, goéland bourgmestre. Alternate name on piece: Larus glaucus [Glaucous gull] Tracing on tissue. Tissue containing drawing of feet of adult bird pasted on. Position of young bird in published plate changed back to an earlier form existing in this drawing but largely obscured, by pasting on Gould item 1912; both pieces show traces of adhesive. Artist's name(s): Gould, John; Hart, William Matthew.