WING OF BIRD 



743 



wing of a bird has much less flexibiUty of parts than the 

 arm of a Mammal. The radius and ulna do not move upon 

 each other. 





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The pelvic girdle consists of dorsal ilia fused to the 

 complex sacral region, of ischia sloping backwards, and of 

 pubes running parallel to the ischia. The incomplete 

 ossification of the acetabulum and the absence of ventral 

 symphyses are noteworthy. 



