Outside of left valve
Species
Photographer / copyright holder
Steve Wilkinson
Length = 40mm. Collected from Isle of Sheppey on 1971 by Joan Llewellyn-Jones.
<em>Zirfaea crispata</em> (Linnaeus, 1758)
Distributed from Norway south to the Bay of Biscay.
Bores into peat, clay, shale, red sandstone, oolite or soft rock and rarely into wood.
Shell up to about 9cm in length and white in colour. Sculpture of concentric ridges folded at the anterior of the shell to create a very rough surface. Periostracum brown.