fried whole belly clams
Check out Gage & Tollner in Brooklyn (it's listed in the phone book). Had the BEST clam bellies there. They were not fried but I'm sure they make 'em fried there, too. Also, excellent she-crab soup.
It was years ago so I hope this beautiful old restaurant is still good.
re: Jessica S.
Yup, Gage & Tollner is still there, and the food is excellent. Yes, they have fried whole clams, and great fried oysters.
NYC prices and portions tho'. Not like Cape Cod (where whole bellies are becoming more expensive every year--often a fried whole clam roll costs more than a lobster roll).
Several places in the city serve them, but none of them seem to be very good. Search for "fried clams" (without the quotes) in the Search box on the Chowhound main page, and you'll find a number of discussion threads. Then, follow each thread up and down to read all the messages, since the search engine doesn't always present its results in the most logical order.
PLEASE: If you find good clams, let the rest of us know!
Where did you eat clams in Mystic? Was it that ice-cream stand along route 1?