The Sea Shore

algae amphipod anemones animals and plants Ascophyllum attached balanoides barnacles bivalves body boring bottom British burrow byssus Chthamalus coasts cockles colour common common periwinkle commonest crabs crustaceans D. P. Wilson desiccation dog-whelks eggs encrusting estuary exposed exposure extend fauna feeding female fish foot fresh water fronds Fucus gills grow growth habit hydroids inches long inhabitants intertidal isopod Laminaria larger larvae limpets live low tide low water lower marine molluscs mouth movement muscles mussels numbers occurs oyster Pelvetia periwinkles plankton polyzoans population prawns protection ragworms razor-shells red weeds region reproduction rock pools rocky shores rough periwinkle rounded salinity sand sandy shores sea-squirts seaweeds shell valves shelter shipworms shown in Plate shrimps siphons snails spawn species spines sponge spring tides squat lobsters starfish stones sub-littoral sub-littoral zone surface swimming temperature tentacles tidal tide marks top-shells tube tube-worms usually weed wide winter worms young