12th Round. Same as 6th round but having ch 3 before and after each shell.
13th Round. Same as 7th round but having ch 3 before and after each shell. Repeat the last 2 rounds once.
16th Round. * Ch 3, 2 tr c, 3 d tr c, 2 tr c with ch 2 between each st in next ch 5 loop, ch 3, 1 s c, ch 5, 1 s c in center of next shell, repeat from * all around ending with ch 3, 2 tr c, 3 d tr c, 2 tr c with ch 2 between each st in next ch 5 loop.
17th Round. * Ch 3, s c between 1st 2 d tr c of next shell, ch 5, s c in next loop of same shell, ch 3, 2 tr c, 3 d tr c, 2 tr c with ch 2 between each st in next ch 5 loop, repeat from * all around ending with ch 3, s c between 1st 2 d tr c of next shell, ch 5, s c in next loop of same shell.
18th Round. * Ch 3, 2 tr c, 3 d tr c, 2 tr c with ch 2 between each st in next ch 5 loop, ch 3, s c between 1st 2 d tr c of next shell, ch 5, s c in next loop of same shell, ch 5, repeat from * all around ending to correspond.
19th Round. Same as 17th round.
20th Round. Work in same manner as 18th round but having 3 tr c, 2 d tr c, 3 tr c with ch 2 between each st in each shell.
21st Round. * Ch 3, 1 s c, ch 5, 1 s c in center of next shell, ch 3, 3 tr c, 2 d tr c, 3 tr c with ch 2 between each st in next ch 5 loop, repeat from * all around ending to correspond.
22nd Round. * Ch 2, work a shell of 2 tr c, 2 d tr c, 2 tr c with ch 2 between each st in next ch 5 loop, ch 2, skip 1 loop of next shell, 1 s c, ch 5, 1 s c in next loop of same shell, Ch 2, skip 1 loop of same shell, work a shell of 2 tr c, 2 d tr c, 2 tr c with ch 2 between each st in next loop, ch 2, skip 1 loop of same shell, 1 s c, ch 5, 1 s c in next loop, repeat from * all around ending to correspond. All shells are worked in same manner for remainder of lampshade cover.
23rd Round. * Ch 2, 1 s c, ch 5, 1 s c in center of next shell, ch 2, shell in next ch 5 loop, repeat from * all around ending to correspond.