… shells of molluscs, crustaceans or echinoderms and cuttle-bone, unworked or simply prepared but not cut to shape, …
Explanatory notes
… shells of molluscs, crustaceans or echinoderms and cuttle-bone, unworked or simply prepared but not cut to shape, … or simple cutting. The heading includes cuttle‑fish bone, crushed or powdered shells used as animal foodstuffs, …