The object of the present paper is to extend the previous observations of the author (3) on the nervous control of the cilia of the Molluscan velum and to provide a description of the cytoplasmic structure of the cells which bear these cilia. It is hoped that a revision of this subject, based as far as possible on observations made on the living cell rather than on fixed material, may be of use in the study of the mechanism of ciliary activity from both the chemical and structural points of view.

1

The thanks of the author are due to Dr Muriel Robertson for much help in the application of this method, which is described by her in a recent paper (15).

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