A seashell or sea shell, kent simply as a shell an aw, is a haurd, pertective ooter layer creatit bi an ainimal that leeves in the sea. The shell is pairt o the bouk o the ainimal. Empie seashells are eften foond washed up on beaches bi beachcombers. The shells are empie acause the ainimal haes dee'd an the saft pairts hae been eaten bi anither ainimal or hae rotted oot.

Seashells washed up on the saunds in Valencia, Spain; nearly aw are single valves o bivalve molluscs, maistly o Mactra corallina