Mergus merganser -- Common Merganser; grand harle, Mergo mayor. Alternate name on piece: Mergus serrator [Merganser] Layout drawing (apparently over Gould's sketch), rather rough, with color added; 6 notes on color, 3 on form; at least 17 points of correction marked graphically. Title in pencil by Sotheran, bookseller. Artist's name(s): Gould, John; Richter, Henry Constantine.