Abstract
The course of the oceanic plankton from over the deep water west of the British Isles is traced as it overflows on to the continental shelves west and north of Scotland, to Faroe, and penetrating the Faroe Shetland Channel to reach the North Sea. The data are based on monthly averages from 1951 to 1966 of the numbers of exotic species, none of which breed in this area. This oceanic plankton has its greatest abundance in May west of the British Isles and takes until August to reach Faroe and the Faroe-Shetland Channel, and until September and October to reach the North Sea.

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