Large Necklace Shell (Euspira catena)

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	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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Pale brownish, glossy shell with one row of reddish-brown markings on lower whorls. Large aperture, smaller hole next to it. Grows up to 1½ inches high. Lays its eggs in curls of jelly mixed with sand - these can often be seen on sandy beaches.