Eocene Bivalve

This is a particularly well preserved shell of a bivalve from the London clay. When seen on the beach they look beautiful but when they dry out the shell turns to powder! In this case only a small corner was showing and I let it dry in its covering of clay. I slowly removed the clay and applied lacquer to preserve the exposed parts.
As the dentition is not visible, positive identification is difficult. I believe that it is a Calpitaria sp.
I get pleasure from a story. The circular hole in this shell tells the story of one little death. This shell was seized in the muscular foot of a carniverous gastropod and a hole drilled with its radula to reach the soft flesh.