Abstract

1.Sodium. potassium and magnesium ion concentrations in the blood of Ocypode were hypoionic (0 normal and concentrated sea water. 2. Over the entire salinity range tested calcium ion concentration was found to remain fairly constant and hyperionic to all media. 3. The changes in haemolymph sodium concentration reflect the changes in tQtal osmotic concentration. 4. Death from desiccation related directly to weight loss,indicatiogthaf wa~er loss probably as circulatin& ha~molymph volume was the critical factor, rather than ionic concentration.

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