Sir Charles Maurice Yonge who died in 1986 was the foremost authority on the Bivalvia and one of the greatest marine biologists of this century. The volume is a memorial to his achievements and comprises 22 papers presented at a symposium in his honour during the IX International Malacological Congress, Edinburgh, Scotland, 1986. It contains 4 sections Evolution, Feeding and Digestion, Functional Morphology, and Ecology, and will be of interest to all students of the Mollusca.