Specimens of Archaeopteryx the results of his investigation was a talk at the Royal Society in London in November, and was published as an abstract in the Proceedings of the Royal Society the following year. Here he considered the single feather described by von Meyer in 1861 and assigned the new skeleton the same genus. Owen speculated possible short- and long-tailed forms of "Archaeopteryx" and on these grounds assigned the London specimen the species name "macrura", meaning "long-tailed". Owen, who published a monograph on the specimen in 1863, generally considered the animal to be a bird despite describing its structure and proportions as
Specimens of Archaeopteryx on the main slab. Both arms are preserved close to their natural articulation with the shoulder girdle, though displaced. The ulna is more robust and curved than the slender radius. A confusing jumble of metacarpals has led some researchers to conclude the beginning of fusion between carpals and metacarpals; this has been rejected by later researchers. Most manual bones of the right wing are missing, and the left wing preserves two metacarpals, the semilunate carpal, and two long, slender phalanges with large, strongly-curved claws. The missing third finger led Owen to conclude a two-fingered hand for "Archaeopteryx" in his original