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PROF. OWEN ON ARGILLORNIS LONGIPENNIS.
or wingless bird, was "pneumatic," therefore part of a bird of flight. But if tibial, the proportions of the humerus of such a bird would far exceed those of the fossils exhibited and referred to that bone. Prof. Owen then pointed out in the supposed tibial fragment intermuscular ridges which, with the more obvious characters he had described, would receive from palæontologists the same interpretation as his own.
