The Sea Shore

acorn-barnacle algae amphipod anemones animals and plants Ascophyllum attached balanoides barnacles bivalves body bottom British burrow byssus Chthamalus coasts cockles colour common common periwinkle commonest crabs crustaceans dog-whelk echinoderms eggs encrusting estuaries exposed exposure extend fauna feeding female fish foot fresh water fronds gill grow growth habit hydroids inches long inhabitants intertidal isopod jellyfish Laminaria larger larvae limpets live low tide low water marine molluscs mouth movement muscles mussels natural naturalist neaps numbers occurs oyster pairs Pelvetia periwinkles plankton plates polyzoans population prawns protection razor-shells red weeds region reproduction rock pools rocky shores rough periwinkle rounded salinity sand sandy shores sea water sea-squirts seaweeds shallow shell valves shelter shipworms shore animals shrimps siphons snails spawning species spines sponges spring tides starfish sub-littoral sub-littoral zone surface swimming temperature tentacles tidal tide marks tube upper usually weeds wide winter worms young