Fine tracing on tissue. Principal toucan circa 18" long (Gould's birds are "the size of life" unless stated otherwise) with a strongly hooked bill (appreciably shorter than that of Gould item 2036), rather like Pteroglossus hypoglaucus. Not found in the published editions of the Monograph of the Ramphastidae, or family of toucans. What the purpose of these drawings may have been is unclear; perhaps Gould intended a further revision and extension of the work. Gould item 2036-2041 share a dynamic that suggests the hand of Hart; all 5 include a principal bird perching, or in the case of Gould item 2040 flying, in a downward diagonal.