Abstract
The family Rissoidae comprises 24 British species, occurring, many in great profusion, in both littoral and sublittoral marine habitats. On rocky shores the most prolific species is Rissoa parva (da Costa), which occupies a number of microhabitats, algae in particular, centred on the infralittoral fringe but reaching as high as M.T.L., and may also be found sublittorally off these shores.

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