Abstract
1. Exposure to environmental salinities ranging from 120 to 720 mM. Cl/L. for 72 hours did not produce changes in fresh weights of the land crab (Gecarcinus lateralis), the ghost crab (Ocypode albicans) or the mangrove crab (Goniopsis cruentatus). There was an increase in weight of questionable significance after 24 hours in crabs exposed to distilled water. Only in distilled water was there any change in the blood specific gravity of ghost crabs. Even this change was of questionable significance.2. The total body water content of ghost crabs is significantly larger than those of land crabs and mangrove crabs, which are similar. The fractions of total water content which are available for the dilution of thiocyanate and inulin are similar in the three species. The volumes available for the dilution of inulin are about two-third the volumes in which SCN appears to be diluted. This suggests the interesting possibility of a functionally closed, lumen flow, circulation.3. The blood chloride concentration of m...
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