On this strandline shell the periostracum and spiral striae have been lost or are barely visible on most of the shell. Nacre deposited by the mantle just within the aperture (<b>1</b>) has protected the brownish periostracum below it. In this specimen some of the nacre has flaked off; its edge was probably directly from 1 to 1 along the brownish line. Height 21.2 mm, South Devon, England, May 2017, Leg. H. Morgenroth & K. Rose.