Yes. Just a big clam that is really hard to catch. digging for them and trying to catch them is fun. One of my good memories of Puget Sound childhood. As food, they are pretty tough and chewy. But just a clam.
I had some in Seattle's chinatown. My brother ordered it. Not something I would order again. It tastes like a clam, but the pieces of meat are big and that accentuates the chewy aspect.