The intertidal rock crevice habitat in western Norway has been investigated. The fauna consists of two elements; the marine, and terrestrial component. The distribution of twenty-one crevice species in western Norway is given. Three distinct environments were recognized, each with its own characteristic fauna. The west Norwegian crevice fauna is compared with the faunas of Anglesey in North Wales, and Plymouth in southwest England. A number of lusitanian species seemingly reach their northern limits in Britain, and were not encountered in western Norway.
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Craig B. Kensler (1964) studied this question.
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