Drawing depicting: Morus serrator -- Australasian Gannet. Alternate name on piece: Sula australis [Australian gannet], Layout sketch by Gould, with perhaps a few lines added by Richter; a sketch of another form of one of the heads in the margin., Interesting sequence: Gould's sketch here, Richter's development at Gould 1516 and 1520, and the published plate.