Abstract
1.1. During locomotion the pond snail Lymnaea stagnalis (L.) exhibits recurrent cyclical movements; in water this behaviour consists of anteriorly and posteriorly directed shell movements and on land these same movements are coupled with longitudinal contractions and extensions of the foot.2.2. Motoneurones innervating the foot, body wall and column have been identified. The activity of some of these neurones is correlated with shell movements during spontaneous locomotor discharges in reduced preparations.3.3. The structure of these motoneurones has been determined by intracellular injection of the fluorescent dye Lucifer Yellow CH.
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