Abstract
1. The concentrations of Na, K and Cl of pellets of sedimented sperm of Arbacia, Mytilus and Phascolosoma have been determined. With the aid of inulin space determinations on the pellets, it can be shown that sperm resemble other cells studied in maintaining, relative to the sea water environment, high internal K concentrations and low Na and Cl.2. Sperm of the three species were separated into head-midpieces and tail fractions. The former retain the ionic selection properties of the whole sperm. Isolated tails appear freely diffusible to all constituents including inulin.3. Using radioactive tracers it is shown that Na and K of sperm are freely exchangeable with the environment.
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