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.
- Shell possesses a median groove
- Front margin draw out into a beak with very rough sculpture
Bores into peat, clay, shale, red sandstone, oolite or soft rock and rarely into wood.
Distributed from Norway south to the Bay of Biscay.