1. Cerastoderma edule. Anterior and posterior of very large live-taken specimen; 68.3mm long, intervalve-width 49.4mm, shell mass 67g. Brown periostracum retained between close scale-spines and ribs on recent stages. Earlier sculpture eroded. Orkney
2. Cerastoderma edule. Anterior and posterior of very large live-taken specimen; 68.3mm long, intervalve-width 49.4mm, shell mass 67g. Brown periostracum retained between close scale-spines and ribs on recent stages. Earlier sculpture eroded. Orkney

Cerastoderma edule. Anterior and posterior of very large live-taken specimen; 68.3mm long, intervalve-width 49.4mm, shell mass 67g. Brown periostracum retained between close scale-spines and ribs on recent stages. Earlier sculpture eroded. Orkney