Melt butter with 2 tablespoons oil in heavy large skillet over medium heat. Add garlic, basil and fennel and sauté 1 minute. Add shrimp and scallops and sauté until both are just opaque, about 4 minutes.
Place linguine in bowl. Toss with remaining 2 tablespoons oil. Pour sauce over linguine and toss. Add 1/3 cup Parmesan and toss again. Pass additional Parmesan separately.
Yield: 4 first or 2 main course servings