In an age of specialization it comes almost as a surprise to find that a symposium honouring the scientific contributions of one man should bear such a broad title: the Biology of Marine Invertebrates. Wyn Knight‐Jones has his specialization, as the long series of papers on the ecology and taxonomy of Spirorbidae reveals; but the earlier papers, offering new leads into several diverse facets of marine ecology, appealed to and stimulated many young biologists. Several of these here present some of their own recent research, which either sprang directly or indirectly from Wyn's own work or guidance to them as graduate students or is offered by colleagues in respect of friendship over many year