Painting, dugong skull and tusks by W H [William Home] Clift Plate 13 showing the base of the skull of a dugong [Dugong dugon] with milk tusks; with details of the permanent tusk appearing in situ and a section of the adult tusk. The work is inscribed with publication and plate details. Signed lower left 'W. H. Clift del.' Royal Society stamp verso. Subject: Zoology Published in Philosophical Transactions as part of paper titled 'On the milk tusks, and organ of hearing of the Dugong' by Everard Home. Read to the Royal Society on 13 April 1820. [1820]