UK / US crochet term:

Chain stitch – ch

Double crochet / Single crochet – dc/sc

Treble / Double crochet – tr / dc

Shell: work 3tr/dc + 2ch + 3tr/dc in the same space.

Spiral: work 15ch, skip 2ch, work 3dc/sc in each of the next 11ch, 1ch.

Stitch – st

Beginning

Make spiral with 1tr/dc: make 15ch, skip 2ch, work 3dc/sc in each of the next 11ch, make 1ch and 1tr/dc in last (15th) ch.

Row 1: Make one more spiral (without tr/dc) and work 3tr/dc + 2ch + 3tr/dc + 2ch + 3tr/dc in space under tr/dc, turn.

Row 2: Make 1 spiral, work shell in first space of 2ch, 3ch, shell in next space of 2ch, turn.

For all the next rows work:

1. The beginning of a row - "BR": make spiral and shell in shell.

2. The end of a row - "ER": make shell in shell and turn.

Row 3: Make "BR" (see above), 5ch, 1dc/sc in space of 3ch, 5ch, 1dc/sc in the same space, 5ch, work "ER".

Row 4: "BR", 3ch, 1dc/sc In 1st space of 5ch, 5ch, 1dc/sc in 3rd space of 5ch, 3ch, "ER".

Row 5: "BR", 3ch, 1dc/sc in space of 3ch, 9tr/dc in space of 5ch, 1dc/sc in space of 3ch, 3ch, "ER".

Row 6: "BR" 5ch, 1dc/sc + 5ch + 1dc/sc in space of 3ch below, 5ch, skip 3tr/dc, 1dc/sc in each of the next 3tr/dc, 5ch, 1dc/sc + 5ch+ 1dc/sc in space of 3ch, 5ch,"ER".

Row 7: "BR", 3ch, 1dc/sc in space of 5ch, 5ch, skip 1space of 5ch and work 1dc/sc in next space, 3ch, 1dc/sc in second dc/sc, 3ch, 1dc/sc in space of 5ch, 5ch, skip space of 5ch, 1dc/sc in next space, 3ch,"ER".

Row 8: "BR", * 3ch, 1dc/sc in space of 3ch, 9tr/dc in space of 5ch, 1dc/sc in space of 3ch; rep from *one more time, 3ch, "ER".

Row 9: "BR",* 5ch, 1dc/sc + 5ch + 1dc/sc in space of 3ch, 5ch, skip 3tr/dc, 1dc/sc in each of the next 3tr/dc; rep from * one more time, 5ch, 1dc/sc + 5ch + 1dc/sc in space of 3ch, 5ch, "ER".

Row 10: "BR", * 3ch, 1dc/sc in space of 5ch, 5ch, skip 1space of 5ch and work 1dc/sc in next space, 3ch, 1dc/sc in second dc/sc; rep from * one more time, 3ch, 1dc/sc in space of 5ch, 5ch, skip space of 5ch and work 1dc/sc in next space, 3ch, "ER".

Row 11: "BR", * 3ch, 1dc/sc in space of 3ch, 9tr/dc in space of 5ch, 1dc/sc in space of 3ch; rep from *(two more times for this row), 3ch, "ER".

Row 12: "BR",* 5ch, 1dc/sc + 5ch + 1dc/sc in space of 3ch, 5ch, skip 3tr/dc, 1dc/sc in each of the next 3tr/dc; rep from *(two more times for this row), 5ch, 1dc/sc + 5ch + 1dc/sc in space of 3ch, 5ch, "ER".

Row 13: "BR", * 3ch, 1dc/sc in space of 5ch, 5ch, skip 1space of 5ch and work 1dc/sc in next space, 3ch, 1dc/sc in second dc/sc; rep from *(two more times for this row), 3ch, 1dc/sc in space of 5ch, 5ch, skip 1space of 5ch and work 1dc/sc in next space, 3ch, "ER".

Repeat rows 11 - 13 until you have reached your desired length.

Last row

Make the last row after "row 12":

Work 3tr/sc in space of 2ch of the shell below, make 1 spiral, 3tr/dc in the same space of the shell, * make spiral, 1dc/sc in fist space of 5ch, 4ch, skip space of 5 ch and work 1dc/sc in next space, make 1 spiral, 1dc/sc in second dc/sc below; rep from *, make spiral, 1dc/sc in fist space of 5ch, 4ch, skip space of 5 ch and work 1dc/sc in next space, make 1 spiral, 1dc/sc in space of 2ch of the shell below, make 1spiral, 1dc/sc in the same space.