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The sheltered beach of Kames Bay, Millport, Isle of Cumbrae, Scotland has been the scene of several important studies on intertidal zonation (Stephen, 1929; Elmhirst, 1931; Watkin, 1942). The last paper is most comprehensive and records in detail the zonation of over twenty species of animals. In the course of the present study I have found Watkin's account very accurate, but incomplete in respect to salinity variation in the interstitial water of the sands. My attention was initially directed to Kames Bay in a search for a population of Nereis diversicolor O. F. Müller inhabitating an essentially ‘marine’ environment in respect to salinity. The suitability of Kames Bay was suggested by a statement of Watkin (1942, p. 558):
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Ralph I. Smith (1955) studied this question.
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