Preheat Oven To 400 Degrees F (200 Degrees C). Place The Butter Or Margarine In 9X13 Inch Glass Baking Dish, And Place In Oven Until Butter Melts. Bring A Large Pot Of Lightly Salted Water To A Boil. Add Pasta And Cook For 8 To 10 Minutes Or Until Al Dente. Drain, And Transfer To A Large Serving Bowl. Stir The Shrimp, Garlic, And Lemon Juice Into The Melted Butter. Return Dish To Oven. Bake For 3 Minutes. Remove From The Oven, And Mix In Parsley; Continue Baking Until Shrimp Are Opaque, About 2 Minutes Longer. Season With Salt And Pepper. Spoon The Shrimp And Butter Sauce Over The Linguini, And Toss To Coat The Pasta. Serve Immediately.