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adult animal animal's Argonauta Arion arms attached beautiful belemnoids bivalves blood body brood pouch burrow byssus called capsules cells cephalo cephalopods chambered nautilus chitons chromatophores cilia clam class of mollusks coast color Cooke creatures cuttlefish Decapoda diameter dibranchs edge eggs Eledone epiphragm eyes feet female fish fishermen flukes forms fresh-water funnel gastropod shells genus giant squid gills gland groups head host Ianthina inches invertebrate jaws known land larva layer length light live Loligo pealii male mantle cavity marine gastropods membrane modified molluscan mollusk shell mollusks mouth mussel nacre nautiloid nerve Octopoda octopus organs oyster pair paper nautilus pearls pelecypods Philippine Plate pods possession radula rasp scaphopod sea-ears secretes shape shipworms siphons skin slugs snails species specimen sperm Spermatophore Spirula stage string structure subkingdom suckers surface swimming teeth tentacles tion tooth tree snails upper usually valves ventral vertebrates wood worm