Abstract
1. 1. The ability to digest protein is compared in seven species of the genus Macoma (Bivalvia: Tellinacea). 2. 2. Protein digestion in all species, with the exception of Macoma secta is largely intracellular and largely under the influence of acid endopeptidases. 3. 3. In M. secta there is a relatively strong extracellular, gastric digestion of protein. This is related to its diet of sand-grain epi-organisms and deposit particles. 4. 4. The gastric and digestive diverticular proteolysis capacities fluctuate, possibly according to tidal or other natural rhythms, and possibly according to quality and quantity of food. 5. 5. The intracellular alkaline endopeptidase of Macoma is chymotrypsin, and the extracellular alkaline endopeptidase is trypsin.
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