Struthiomimus sedens skeleton in the Oxford University Museum of Natural History
is a 1.6" long hand bone of the ornithomimid dinosaur Struthiomimus sp.. Struthiomimus were long-legged, bipedal, ostrich-like dinosaurs with toothless beaks. It was estimated that they could reach a size of approximately 13 feet in length. It's thought that due to their abundance, they must have been herbivores or omnivores.
The proximal end of this bone has multiple repaired cracks, as well as a fairly large gap where the bone broke and is missing. It's likely that this came from the medial phalange.