1. Eye position in Sepia was measured in restrained animals, using a scleral search coil technique.
2. Optokinetic nystagmus was elicited by drum rotations from 0.035 up to 35°/sec.
3. Passive rotation of Sepia in darkness evoked a transient nystagmus, followed by after-nystagmus at arrest.
4. Combination of these two stimuli yielded the best results, but the ratio eye velocity/surroundings velocity was usually not better than 0.5.
5. Eye movements were conjugate and a closed eye could be driven by a seeing eye. Monocular reactions were smaller than binocular ones, but equal in both directions.
6. Fixation movements could not be demonstrated in the present conditions.