1. Cerastoderma edule. Shell length 23.9mm. Anterior and posterior ends. External ligament on posterior. 6 or 7 annual growth lines visible on anterior, others may be crowded and indistinct. Dee Estuary, Chesh. Oct. 2011.
2. Cerastoderma edule. Shell length 23.9mm. Anterior and posterior ends. External ligament on posterior. 6 or 7 annual growth lines visible on anterior, others may be crowded and indistinct. Dee Estuary, Chesh. Oct. 2011.

Cerastoderma edule. Shell length 23.9mm. Anterior and posterior ends. External ligament on posterior. 6 or 7 annual growth lines visible on anterior, others may be crowded and indistinct. Dee Estuary, Chesh. Oct. 2011.