Incomplete shell. Washed up on beach
Double shark fins! The smaller male is stacked on the larger female (who is attached to a Brown Turban), just like the photo in Lamb and Hanby, p. 218.
Broken, but it was beautiful enough to want to know what it is!
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 .