CRAB AND SHRIMP CASSEROLE

Crab and Shrimp Casserole

1/4 cup butter
1 pound fresh mushrooms, sliced
5 tablespoons flour
2 cups light cream
1/4 cup sherry
2 cup mayonnaise
1/2 cup minced parsley
1/2 cup scallions, chopped
3 cups bread crumbs
1 pound crab, well cleaned
1 pound shrimp, cooked and peeled
2 (14 ounce) cans artichokes, chopped
Parmesan cheese, to taste