… not otherwise worked; shells of molluscs, crustaceans or echinoderms and cuttle-bone, unworked or simply prepared but …
Explanatory notes
… not otherwise worked; shells of molluscs, crustaceans or echinoderms and cuttle-bone, unworked or simply prepared but … cuttle‑fish bone, crushed or powdered shells used as animal foodstuffs, and waste of shells. The heading excludes rods, rectangular (including square) plates and other …