Malacolimax tenellus. Photographer David Lindley.

Malacolimax tenellus. Photographer David Lindley.

Helcion pellucidum, North Wales. Photographer Peter Topley.

Hermaea bifida, Wales. Photographer Peter Topley.

Chlamys varia with a think coating of sponge surrounded by bryozoan-encrusted saddle oyseter and other colonial organisms. Phptographer Peter Topley.

Rissoa lilacina from Traeth Crugan, Wales. Photographer Peter Topley.

Gibbula magus at Traeth Crugan, Wales. Photographer Peter Topley.

Limax cinereoniger (juv) at Cannop Ponds, Forest of Dean. Photographer Ron Boyce.

Malacolimax tenellus found at Foxes Bridge, Forest of Dean. Photographer Ron Boyce.

Pale form of Arion flagellus foune at Foxes Bridge. Photographer Ron Boyce.