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The principal objectives of the present study are: (1) To investigate sodium transport across the midgut as well as the hindgut of Ca11inectes sapidus and the functioning of these two regions of the gut in osmotic and ionic regulation of the animal, and (2) to elucidate the mechanism of glucose absorption across the midgut of Q. sapidus and to assess its role in nutrient absorption. The transport processes across the gut tissues were studied with an in vitro perfusion technique. I demonstrated a net mucosal to serosal sodium transport across the midgut of C. sapidus. This net flux was within the same order of magnitude as the fluxes of isolated gut tissues of many other animal species. The flux displayed. saturation kinetics and was ouabainsensitive. The flux did not vary with environmental salinity, thus providing no evidence for an active regulatory role of the midgut in sodium balance. A reduction of passive permeability with salinity, however, was suggested. There was no measurable net sodium transport across the hindgut of the animal •

Sodium and glucose transport across the in vitro perfused midgut of the blue crab, Callinectes sapidus Rathbun