Cut Trough Shell (Spisula subtruncata)

Helical Shells

Large Necklace Shell Common Whelk Red Whelk Common Spindle Shell Common Winkle Flat Periwinkle Dog Whelk Netted Dog Whelk Sting Winkle Grey Top Shell Painted Top Shell Purple Top Shell Thick Top Shell Tower Shell Needle Shell Common Wendletrap Acteon Shell Pelican's Foot Shell

Bivalves

Cockle Dog Cockle Prickly Cockle Norwegian Cockle Pullet Carpet Shell Cross-cut Carpet Shell Banded Carpet Shell Smooth Clam Iceland Cyprina Common Mussel Otter Shell Sand Gaper Blunt Gaper Common Piddock American Piddock White Piddock Blunt Tellin Rayed Artemis Smooth Artemis Warty Venus Peppery Furrow Shell Edible Oyster Portuguese Oyster Pacific Oyster Saddle Oyster King Scallop Queen Scallop Variegated Scallop Hunchback Scallop Tiger Scallop Striped Venus Thick Trough Shell

Cut Trough Shell

Rayed Trough Shell Banded Wedge Shell Faroe Sunset Shell Wavy Venus Thin Tellin Baltic Tellin Pod Razor Razor Bean Razor Curved Razor

Everything Else

Bonnet Shell Common Limpet Black Footed Limpet China Limpet Slipper Limpet Common Tusk Shell Cowrie Shell European Cowrie

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Roughly triangular in shape with concentric markings, up to 1 inch long. Striations very conspicuous. Trough shell species can be often distinguished by their length / width ratio - in this case approximately 1.4.