Onycha

"A nail; claw; hoof, (Heb. sheheleth; Ex. 30:34), a Latin word" "applied to the operculum, i.e., the claw or nail of the strombus" "or wing-shell, a univalve common in the Red Sea. The opercula of" "these shell-fish when burned emit a strong odour "like" "castoreum." This was an ingredient in the sacred incense."