Edc: Extended double crochet
Extended dc: Yo, insert hook in specified st or sp and draw up a lp, yo and draw through 1 lp on hook, [yo and draw through 2 lps on hook] twice.
Closed mesh: Edc in next 3 Edc (or 2 Edc in next ch-2 sp, Edc in next Edc).
Open mesh: Ch 2, skip next 2 sts, Edc in next Edc.
Make 2 squares with each color.
Edc are used throughout squares to obtain taller stitches to help squares come out square.
SQUARES (make 12)
With appropriate color, ch 67 loosely.
Row 1 (RS): Working in back bump of chs, Edc in 5th ch from hook (skipped chs count as first Edc), Edc in each rem ch across - 64 Edc (21 closed mesh).
Row 2: Ch 3 (counts as Edc), turn; Edc in next 3 Edc, [ch 2, skip next 2 Edc, Edc in next Edc] 19 times, Edc in next 2 Edc, Edc in first skipped ch - 2 closed mesh and 19 open mesh.
Rows 3-21: Work according to chart and Special Terms. On each row, ch 3, turn at beginning of row and work last Edc of last closed mesh into 3rd ch of turning ch. Do not fasten off.
Round 1 (RS): Ch 1, 3 sc in top of last Edc made, working along left edge, work 62 sc evenly spaced down left edge, working in free lps on bottom edge, 3 sc in first ch, sc in each ch across to last ch, 3 sc in last ch, work 62 sc evenly spaced up right edge, 3 sc in 3rd ch at beginning of Row 21, sc in each Edc across; join with slip st in first sc -260 sc. Fasten off, leaving a long tail for sewing.
With RS together, whip stitch squares together into 4 rows with 3 squares in each row as per assembly diagram. Using yarn needle, weave in all ends.
Round 1 (RS): With RS facing, join F with sl st in center sc in any corner, ch 1, 2 sc in same sc as joining, sc in each sc around, working 3 sc in center sc in each corner, sc in same sc as joining; join with slip st in first sc - 928 sc.
Round 2: Ch 1, 2 sc in same sc as joining, sc in each sc around, working 3 sc in center sc in each corner, sc in same sc as joining; join with slip st in first sc - 936 sc.
Round 3: Ch 3, 2 dc in same sc as joining (beg shell made), *skip next 2 sc, (slip st, ch 3, 2 dc) in next sc (shell made); rep from * around; skip last 2 sc; join with slip st in same sc as joining sl st - 312 shells. Fasten off.
Weave in ends.