Melt 16 marshmallows in 1 cup milk; pour over 1 package of lime Jello. Add 2 (3 ounce) packages of Philadelphia cream cheese. Mix well. Add 1 (#2) can drained crushed pineapple. Cool; whip and add 1/2 pint whipping cream and 2/3 cup mayonnaise. Pour in mold and chill until firm.