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1. Membrane constants of the closer muscle of the ghost crab, Ocypoda cursor, were determined before and after treatment in hypertonic glycerol solution and return to an artificial sea-water (A.S.W.) solution.

2. Muscle contraction was abolished after return of the muscle to A.S.W.

3. The membrane capacitance was reduced from 29·0 µF/cm² to 10·5 µF/cm².

4. Other passive properties of the muscle membrane, not dependent on capacitance, were not changed.

5. The presynaptic nerve, transmitter release, post-synaptic sensitivity to transmitter and ionic mechanisms of synaptic action were unaffected by glycerol treatment.

6. More than 60% of the membrane capacitance/unit area is contributed by the complex tubular system.

7. The tubular system in crustacea is necessary for excitation-contraction coupling.