soft-shelled

Two species of the former are known to New Yorkers, one as the "round," another as the "long" or "soft-shelled" clams.

Soft-shelled crabs require a somewhat different kind of preparation.

But you can't catch soft-shelled crabs on a string and a chunk of meat.

The six little Bunkers had often seen the fishermen on Clam River dig down after these soft-shelled fellows.

After breakfasting on a dish of prawns and another of soft-shelled crabs, I was off across the bay.