Sula dactylatra personata -- Masked Booby, Bobo enmascarado, Fou masqué. Alternate name on piece: Sula personata [Masked gannet] Layout and bird position retained, but head of male very much changed in the published plate. Interesting sequence: Gould's sketch here, Richter's development at Gould item 1517, and the published plate. Non-relevant sketch of a man, perhaps in nautical costume, in the top margin. Artist's name(s): Gould, John; Richter, Henry Constantine. Rough sketch by Gould.