Abstract
1. 1. Haemolymph osmolality and ion (Cl −) concentration were studied in 2 intertidal crabs, Pachygrapsus marmoratus and P. transversus. 2. 2. The haemolymph osmolality hardly changed throughout the year. 3. 3. Both crabs were hyper-osmotic at salinities less concentrated than sea water, and hypo-osmotic at salinities of 125, 150, 175 and 200% sea water. 4. 4. Low (Cl −) concentration changed with the ambient salinities. It rose steeply at 200% sea water. 5. 5. Dehydration caused a rise in haemolymph osmolalities in both species but more significantly in P. transversus.
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