Bivalve Shell

Bivalve Shell

Observation - Bivalve Shell - UK and Ireland. Description: Rough shelled bivalve, with concentric banding. 31mm across. Shell feels thin, but robust. I can't p

Rough shelled bivalve, with concentric banding. 31mm across. Shell feels thin, but robust. I can't place it with anything obvious, so was wondering if it (or rather they, as there were about 20 shells washed up) could be a young Mya arenaria.