The shell-fish opens the shells a little when paralysed by alcohols. The author, therefore, intended to improve the method of "Chemical Shucking" on the basis of this fact, and investigated how the shell movements of Paphia philippinarum, Corbicula leana and Mactra veneriformis would be changed with ethyl alcohol and how the resulting paralysis would happen, and found out the following facts. In normal state s , the shell-fishes have a tendency to close the shells as the concentration of alcohol increases, and therefore the time required for paralysis becomes longer. In th e shells opened a little by inserting a wood wedge between them, however, the time needed for paralysis is inversely proportional to the concentration of alcohol. Very irre gular shell movements are recognizable at low concentration of alcohol, and the states at which the paralysis begins in Paphia and Mactra differ from each other as is shown in Fig. 1.
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