Lapidary snails?

Lapidary snails?

Observation - Lapidary snails? - UK and Ireland. Description: Snails with a flat shell up to 2cm in diameter with a very obvious sharp keel. Very numerous all along a dry stone wall and crawling up an ash tree.

Snails with a flat shell up to 2cm in diameter with a very obvious sharp keel. Very numerous all along a dry stone wall and crawling up an ash tree.