Abstract
1. 1. The activities of lysozyme, acid and alkaline phosphatases, β-glucuronidase, amylase, lipase, glutamic-oxalacetic transaminase, and glutamic-pyruvic transaminase in the whole hemolymph and 4000 g pellets and supernatants of Crassostrea virginica and Mercenaria mercenaria were assayed. All of these enzymes, except for amylase, occurred in whole hemolymph as well as in the fractions of both species of molluscs. 2. 2. Amylase only occurred in the whole hemolymph and serum of C. virginica. Since this mollusc possesses a crystalline style, the amylase is believed to have originated from this structure. 3. 3. It is postulated that the lysosomal enzymes detected in the serum of both species of molluscs had been released from certain hemolymph cells and may play a role in destroying certain invading organisms.
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