258 
Allen’s naturalist’s library. 
ties. Thus Mr. Ogilvie Grant writes : — “ Their general 
structure presents many striking Columbine characters, as in 
the vocal organs, pterygoid bones, and the presence of basi- 
pterygoid processes {bp) in the skull (fig.i), the shoulder-girdle. 
sternum, and especially the great deltoid process of the humerus, 
or upper-wing bone; but the digestive organs are like those 
of the True Game-Birds.” 
Fig. 3. — Sternum of Pterocles alcltafus. 
