1991 242 p., num. figs (some col.), paperbound. Journal of Molluscan Studies Supplement.In all 23 papers on Opistobranchs, including: Rudman, The evolution of colour in chromodorid nudibranchs / McDonald & Nybakken, Preliminary report on a worldwide review of the food of nudibranchs / Cervera et al., The genus Runcina in the Strait of Gibraltar / Cattaneo-Vietti, Nudibranch molluscs from the Ross Sea, etc. [including descriptions of new species].