There is an institution in Woods Hole (Mass) that provides marine animals for research and education. I forgot its name but you might find it online.

The Marine Resources Department at Woods Hole, Marine Biology Laboratory in Massachusetts, USA can help. You might also just connect with field biologists at any of the eastern U.S. marine laboratories. Cyrtopleura costata has a wide range along the western Atlantic (US) and you might find colleagues who have access to these bivalves. Local marine/coastal invertebrate zoologists will have best sense of where to find these (they burrow into a variety of substrata from sand to clay to muds).

Steffen Kiel Thank you Steffen, I will search it.

Kenneth M Towe

Kenneth M Towe