07 Gibbula magus. Large old specimen, height 25.5 mm, breadth 31.5 mm. Cardigan Bay, Wales. 2015.

1: unstained white recent growth.
2: old outer layer stained dark.
3: outer layer worn thin, showing grey of inner nacre layer.
4: outer layer completely eroded, revealing silver nacre (also at apex of shell).
5: dark red-brown epiphytic growth.
6: green algal growth (also on base of shell where epipodium has shielded it from abrasion by sand).