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Journal of Experimental Biology 37,390-397 (1960)
Published by Company of Biologists 1960

The Shadow Reaction of Diadema Antillarum Philippi : III. Re-Examination of the Spectral Sensitivity

M. YOSHIDA ¹ and N. MILLOTT ²

¹ Department of Zoology, Bedford College, University of London; The Marine Laboratory, Shibukawa, Tamano City, Okayama, Japan.
² Department of Zoology, Bedford College, University of London

1. The action spectrum of the shadow reponse of Diadema spines was redetermined by a matching method and a procedure which eliminated certain defects of that previously used.

2. Maximal sensitivity occurs between 455 and 460 mµ. When compared with the curve previously obtained the maximum is shifted 5-10 mµ toward the violet, but the form of the curves is similar and when the earlier curve is corrected by a factor obtained in the present study the two coincide.