{{explanation}}
3s & 4s start on opp sides

1-8
: 1s & 4s cross RH, cast in 1 place (2s+3s step up/down) & dance 1/2 Figs
  of 8 round end couples.  2 1 (4) (3)
9-16
: 1s & 4s dance Ladies' Chain
17-24
: 1L with 2s & 4L with 3s dance RH across, 1M with 2s & 4M with 3s dance
  LH across
25-32
: 1s+4s dance 1/2 R&L (omit polite turn) & dance 1/2 RSh reels of 4 on
  sides. (3) (1) 4 2
33-40
: All set, cross RH & all circle 8H round to left 1/2 way to end  2 4 (1)
  (3)