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abalone ammonite aperture apex Basket-shell beaches body whorl burrow California CaUiostoma cephalopod Class Cockle coiled collecting collector color columella Common Bivalve concentric lines conspicuous cuttlefish epidermis Figure 12 flattened foot four inches Gastropod Shells Geoduck Giant Chiton Girdle bears Gray Haminoea heavy shell hinge inside Jackknife Clam Johnson and Snook knobs left valve ligament Limpet Figure lines of growth living mollusk margin microscopic Modiolus mollusk body Mud flats muscle Mussel N.C.S. Diameter N.C.S. Height N.C.S. Length Nassarius nearly numbers one-half inch operculum outer lip oyster Pacific Coast Paper Nautilus periostracum Piddock plates posterior end prominent pupils purple radula rasping reach nine inches reaches one inch reaches three inches reaches two inches rough rounded Scallop Seashore Animals Shell absent Shells continued shells gape Shells thin shipworm siphons smooth snail species specimen spiral ridges spiral shell surface teeth tide TOOTH SHELLS umbo univalve usually valve varices Varix