Image of Petricola Lamarck 1801

Description:

In this inside view, the anterior end of the shell is up and posterior is down. The well-defined pallial line is visible in both shells, as well as the deep pallial sinus near the posterior end. Both the anterior and posterior adductor muscle scars are visible near the hinge, with the posterior scar most evident. A good deal of brown, adhering periostracum can still be seen near the hinge of this individual.