Configuration of the palate, precoracoid, pelvis, intestinal convolutions, copulatory organ, &c. Loss of the keel is co-ordinated with the power of using the forelimbs for locomotion; although a " Ratite " character, it is not sufficient to turn a Notornis, Cnemiornis or Stringops, not even a Phororhacos into a member of the Ratitae.
The small and mobile forelimbs bear four complete fingers, with the thumb reduced to a bony spur.
Forelimbs absent; hind-limbs transformed into a pair of scale-covered flaps.
In the forelimbs the bones corresponding to the third and fourth metacarpals of the pig's foot are fused into a cannon-bone; and a similar condition obtains in the case of the corresponding metatarsals in the hind-limbs.
The forelimbs are always a pair of wings, the fifth digit or "little" finger being enormously elongated for the support of a smooth flying membrane (seen in specimens from the lithographic stone of Bavaria).
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