IN most of the recent literature1,2 concerning the food, feeding habits and digestive processes of the lamellibranchs, it is claimed: (1) that the food of this class (septibranchs excepted) consists of minute particles mainly of plant origin; (2) that the digestion of protein and fat is exclusively intracellular and takes place either in the cells of the digestive diverticula or in wandering phagocytes; (3) that the digestive diverticula are not organs of secretion.