Abstract
An investigation of the cerebral nervous system was made in one caenogastropod and 59 heterobranch gastropods and gave the following results. Each order of the class Gastropoda shows characteristic features in the shape of its cerebral nerves. Homologies of the cerebral nerves in different gastropod taxa are recognized on the basis of their position and function. Consequences for the systematics of Gastropoda are a separation of Architectonicidae and Pyramidellidae, formerly united in the clade Allogastropoda (Hasz-prunar, 1985a); a derivation of the Archaeopulmonata from below the level of basal ‘cephalaspids’.

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