The Large Necklace Shell (Euspira Catena) is a distinctive marine snail found around the British Isles, extending to the North Sea and Mediterranean. This particular specimen was recorded as having been collected in the Bay of Biscay.

The species inhabits sandy seafloors from low water levels to depths of 125m, feeding primarily on bivalves (molluscs with a two-part hinged shell). The shell is typically buff or pale yellow in colour and grows to around 3 cm.

The Large Necklace Shell is named for the elegant row of brown markings that delicately encircle the last whorl of its smooth, glossy shell, resembling a necklace. The Large Necklace Shell is also known for its unique egg-laying behaviour, with eggs arranged in a collar-shaped jelly mass.