Thick Top Shell (Monodonta lineata)

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
(Mysia undata)	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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Shell up to 1 inch high, grey or greenish with overlapping grey lines, slight 'tooth' on inside of aperture and mother-of-pearl tinge.