Spisula subtruncata (DA COSTA)

Mollusc shell, Spisula subtruncata (DA COSTA) (bivalve); 2 of the 4 shells are quite good; dredged from seabed from the Quaternary (Holocene) deposits, of Eddystone Shell Gravel Sula B2, Eddystone, Plymouth, Devon, England collected by Plymouth Marine Biological Station