Abstract
1. 1. In dilute media, sodium, potassium and calcium ion concentrations in the blood were hypertonic, in high salinities ion regulation was less effective. 2. 2. Hypertonic regulation, except magnesium, was effected by extra-renal mechanisms. The principal function of the antennary gland is the maintenance of a hypotonic magnesium concentration. 3. 3. No consistent effect of temperature on cation regulation was demonstrated. A gradual impairment of the magnesium regulatory mechanism resulted from increased temperature. 4. 4. Seasonal differences to regulate sodium and potassium were not consistent. Calcium regulation by winter animals was more effective. Magnesium regulation was identical summer and winter. 5. 5. It is suggested that the principal site of ion uptake is the lamellar epithelium of the gill.
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