Found in one of the rockpools at Poppit Sands, at the base of a cliff.
Second one of these found washed up on beach. No idea? Part of a shell or a fish gill or what? An operculum- the 'door' on a gastropod shell.
The Neotaenioglossa is an taxonomic name for a large group of mostly sea snails. The name was originally created by Haller in 1882. Ponder and Warén (1988), and Marquet (1997), assigned this name to the superorder Caenogastropoda. ITIS considers the order Neotaenioglossa to be a synonym of Cerithioidea Férussac, 1819 .