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This looks like an empty cocoon of a luna moth (Actias luna; Lepidoptera: Saturniidae) - they often are found wrapped in a leaf or leaves - see http://tinyurl.com/yg2tfc9 for an example.
Interesting. I had not seen it before Friday and I frequently pass by the Quince bush. I had hoped it was a recent structure, since one of the leaves incorporated (other side of the cocoon) is green.