Preheat oven to 350F. Combine ricotta cheese, spinach, eggs, 2 tb Parmesan cheese, parsley, nutmeg and pepper. Mix well. Pour 1 cup sauce into a 11 x 7 x 2" baking dish. Arrange 3 lasagna noodles in a single layer on top of sauce. Spoon 1/3 of spinach and ricotta mixture over top and 1/2 cup mozzarella and rest of Parmesan cheese. Pour 1 1/2 cups of tomato sauce over cheese. Place another layer of noodles on top and repeat layering, using mozzarella cheese only. Cover tightly with aluminum foil and bake for 1 hour. Remove foil and bake 10 minutes longer. Let stand 10 minutes before cutting.