The original had the tips curving up. That is how I have always tied them. They started to be produced commercially with the tips curving down and now that's the way most people tie them. It probably doesn't matter at all, except for personal preference.
I have seen a fly tied by Doug Prince. It was tied with a black or very dark gray ostrich herl body instead of peacock. I don't remember it having a prominant rib. The tips of the biot wings curved up. And it was quite large, maybe a size 6 or 8 long shanked hook.
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