Abstract
1. 1. The digestive diverticula, kidney and mantle tissue of Anodonta kennerlyi (Lea), Mytilus californianus (Conrad), Saxidomus giganteus and Compsomyax subdiaphana (Carpenter) were investigated. 2. 2. Ornithine transcarbamylase, argininosuccinate synthetase, argininosuccinate lyase and arginase were detected in the digestive diverticula of all species examined. 3. 3. Argininosuccinate synthetase was found to be rate limiting in urea biosynthesis. 4. 4. The full complement of uricolytic enzymes—uricase, allantoinase, allantoicase and urease—was found in the digestive diverticula of all four species. 5. 5. Uricase and allantoicase were found to be equally rate limiting. Carbam ylphosphate synthetase activity could not be detected. 6. 6. None of the enzymes investigated were found in the kidney or the mantle.
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