1. The conduction of information from the eyes of two basommatophoran snails has been investigated.

2. In the optic nerves of Helisoma trivolvis and Planorbis corneus a flash of light to the eye produces a procaine-insensitive DC potential that is graded with stimulus intensity and lasts as long as the stimulus.

3. The similar spectral sensitivities, time courses and latencies of the ERG and the slow wave of the optic nerve suggest that the DC response is a decrementally conducted receptor potential.

4. Superimposed on the DC shift are procaine-sensitive oscillations.

5. The oscillations may be either local or propagated regenerative events.

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