Abstract
1. The histology and enzyme histochemistry of the stomach and digestive gland of Arctica islandica were examined. Several enzymological and morphological features contribute to a well-developed system of extracellular digestion in this species.2. Extracellular exopeptidases and alkaline phosphatases are largely derived from primary and secondary ducts. The epithelium of these ducts also secretes esterases and acid phosphatases. In all cases, secretory activity of the ducts overshadows that of the stomach wall. Other digestive enzymes, including acid endopeptidases, are supplied by fragmenting digestive cells. Starvation has little apparent effect on most enzyme activity, but does depress secretion of alkaline phosphatases and intracellular production of acid phosphatases. These enzymes can be induced under appropriate feeding conditions.3. The primary ducts in A. islandica are organized into many ciliated folds, rather than separate rejection and acceptance tracts characteristic of anisomyarian bivalves. ...
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