Drawings, abdominal integument and mammary glands of the Ornithorhynchus paradoxus [platypus] by [Richard Owen] Plate 18, figures 1, 2, and 5 (labelled here as figure 1-2) showing the abdominal integument, mammary areola, and a magnified view of a lobule of the mammary gland of the Ornithorhynchus paradoxus [platypus]. Inscribed with publication and plate details. A pencil inscription above reads 'Ovae'. A faint outline of figures 3 and 4 is visible below the drawings. A very faint pencil inscription, largely illegible, appears to provide an explanation in the figures akin to the explanation that appears in the text. Not signed. Subject: Zoology Published in Philosophical Transactions as part of paper titled 'On the mammary glands of the Ornithorhynchus paradoxus' by Richard Owen. Read to the Royal Society on 21 June 1832. [1832]