[Vision in the edible snail: the spectral sensitivity of the dark-adapted eye].

The spectral sensitivity of the dark-adapted eye of Helix lucorum L. was investigated using a semi-intact preparation "ball of the eye--optic nerve--cerebral ganglion". The amplitudes of responses of the electroretinogram to monochromatic stimuli of different intensities were used for a reconstruction of the spectral sensitivity. The averaged curve of the spectral sensitivity coincided well with the Dartnall's nomogram for a pigment having the maximum of spectral sensitivity near 496 nm.