CLASSIFICATION OF BIRDS 



769 



There is no pygostyle. The vertebrae seem to have been either 

 amphicoelous or with flat ends ; the ribs are very slender, without 

 uncinate processes ; there seem to have been " abdominal ribs " ; the 



Fig. 461. — Restoration of Archaeopteryx. — By kind permission 



of Mr. W. P. Pycraft. 



The figure shows the teeth in the jaws, hints of the biserial tail feathers, 

 and the three claws on the outstretched wings which are seen 

 from the ventral aspect. 



sternum is not clearly known ; there is a U-shaped furcula. The 

 metacarpals seem to have remained separate ; the first finger has 

 two phalanges, the second three, the third three or four, and all 

 are clawed. There is a tarso-metatarsus and four toes, as in the 

 pigeon. 



49 



