Using Photoshop 7, there is indeed something there crossing the right leg, or more correct to say, lying next to it. After enhancing the contrast and brightness of the specimen, the entire image was put in negative and the part becomes somewhat distinctive. It are two slender elements which are seperated from another, though the identification leaves in doubt. On one hand it could a tail (based on the fact that it is somewhat curved, unexpected in a wing bone), but it could be a the last wingfinger of the wing as well. This element is connected to another, more rigid element, so, given what interpration mentioned above is right, it could be either a partial dorsal or sacral series or another wingfinger. Are we on the right track here David?