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It has been observed that the pH in the different parts of the alimentary canal of Corophium is nearer neutrality; while the medium in the ventral hepatopancreatic caeca is more acidic, being in the neighbourhood of 6.2.Investigations on the qualitative estimation of enzymes indicate that none of the enzymes are secreted by the gut proper. However, the ventral caeca only secrete many of the carbohydrate splitting enzymes; proteases and lipase are also secreted by the caecal cells of CorophiumIt has also been estimated that the optimum pH for the activity of the caecal amylase lies in the neighbourhood of 5.8.

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Summary. Corophium volutator Pallas is a small amphipod crustacean which burrows in inter‐tidal mud on the British coast, and feeds on organic detritus, mainly vegetable, by selecting particles from the mud. The alimentary canal consists of foregut, midgut and hindgut. The midgut is produced into a pair of anterior dorsal caeca, a pair of ventral caeca and a pair of posterior dorsal caeca. The cardiac stomach has a large number of chitinous plates or ridges beset with hooks and spines for the trituration of food. The pyloric stomach has long fine bristles which form an eifective filter apparatus and allow only fine particles of food to pass into the midgut, where they are digested and absorbed. The hepato‐pancreas secrete digestive enzymes and store reserve food material as oil globules.