Mash 1 cup of blueberries. In 2 qt. saucepan, stir together sugar and cornstarch. Gradually stir in the water until smooth. Stir in mashed blueberries and lemon rind. Cook over medium heat, stirring, until thickened and boiling. Boil 1 minute. Turn into a bowl; cover with wax paper. Cool. Fold in remaining berries. Whip cream until double in volume. Spread 1 1/2 cup of whipped cream over bottom and up sides of pie shell. Fill with blueberry mixture. Garnish with remaining whipped cream. Chill until set -about 3 hours.