. The structure and life of birds . Head of Archseoptery: This ancient bird was about the size of a rook. Histail was long, consisting of twenty vertebrae, at leastthe twelve hindmost bearing a pair of well-developed. Fig. 14. —Part of wing of , carpal bone ; d, i, 2, 3, digits ; m, metacarpal; r, radius ; u, ulna. feathers. His breast-bone seems to have been wing was strong and well-developed, the humerusremarkably big at the near end, the bones of the fore- D 2 36 THE STRUCTURE AND LIFE OF BIRDS chap

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