Microscope studies of the stinging structures or cnidocytes found in sea-anemones.
Plate 1 figures 1-10, including details from specimens identified by the author as Corynactis viridis, Sagartia bellis and Cyathina smithii.
Unpublished illustrations from the manuscript version of the paper 'Researches on the poison apparatus of the Actiniadae' by Philip Henry Gosse, in Proceedings of the Royal Society of London, vol.9 (1857-1859), pp.125-128.