LIST OF ILLUSTRATIONS IN THE TEXT. 



PAGE 



Fig. 1. Diagram of the Pigeon with the feathers removed to 

 show the arrangement of the feather tracts (after 



Nitsch) 2 



„ 2. Diagram of the modifications of the deep plantar 



tendons of the feet of birds 2 



„ 3. Base of the skull of Corvultur albicollis, showing 

 the segithognathous arrangement of the palate 



bones 3 



,, 4. Base of the skull of Orus pavonia, showing the 



schizognathous arrangement of palate bones 4 



„ 5. Base of the skull of Serpentarius secretarius, show- 

 ing the desmognathous arrangement of the palate 



bones 5 



,, 6. Base of the skull of Cathartes aura, showing the 

 second type of the desmognathous arrangement 



of the palate bones 6 



,, 7. Base of the skull of DromcBMs, showing the dromsBO- 



gnathous arrangement of the palate bones 7 



,, 8. Foot of Upupa africana 10 



„ 9. Upupa africana 11 



,, 10. Ta,il oi Irrisor viridis 13 



„ 11. Irrisor viridis 15 



,, 12. y^ing oi Cypselus africanus 20 



,, 13. 'Foot oi Cypselus africanus 20 



,, 14. Cypsehis africanus 22 



,, 15. Foot of Tachomis parva 28 



„ 16. Tail oi ChcBtura stictilczma 30 



,, 17. 'Eoot oi Gaprimulgus europceus 81 



,, 18. Gaprirmdgus fossii 40 



19. ^ ing oi Cosmetornis vexillarius 43 



20. Coracias mosambicus 52 



