Below you can see a close up. I haven't been able to find directions online, but I am sure if you look through the masses of patterns on Ravelry you will be able to find something similar or exactly like it.
Row 1: sc in 2nd chain from hook and in each chain across, turn (125 sc)
Row 2: Ch 3, sk next sc, *5 dc in next sc**, skip next 3 sc, repeat from * across ending last repeat at **. Skip next sc, dc in last sc, turn.
Row 3: Ch1, sc in first dc, ch 2, sc in center dc of next dc group [ch 3, sc in center dc of next dc group] across, ch 2, sc in last stitch (which is the first ch 3 of row 2) turn.
Row 4: Ch 3, 5 dc in each sc across, ending with dc in last sc, turn. Repeat rows 3 and 4 until it is as long as you want. Then you will crochet 5 dc shells evenly spaced at the ends and beginnings of each row plus the un-crocheted side of the initial chain.