1. The aim of the present investigation was to confirm the results obtained in the previous paper with the aid of the microelectrode.

  2. It is concluded that the two components, H-I and H-II, originate from different structures in the receptor layer.

  3. It is shown that a difference in the steady potential ranging from 10 to 50 mV is maintained across the basement membrane.

Cambaras clarkii in the previous paper.

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This section was prepared by Mr T. Samuta. We appreciate his kindness in permitting the use of his preparation.

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