Hepatopancreatic ceca of the Amphipod are lined with epithelial cells located on a basement membrane, which is enclosed by a thin muscle network covered with connective tissue (Schultz, 1974; Schmitz and Scherrey, 1983). The epithelial cells are known to facilitate the digestion of food and assimilation of nutrients (Schmitz and Scherrey, 1983; Agrawal, 1965).