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 GorvuUur albicollis, showing 

 the segithognathous arrangement of the palate 

 bones 3 



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



schizognathous arrangement of palate bones 4 



,, 5. Base of the skull of ISerpentarius secretarius, show- 

 ing the desmognathous arrangement of the palate 

 bones 5 



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

 second type of the desmognathous arrangement 

 of the palate bones 6 



,, 7. Base of the skull of i)ro;?icsMs, showing the dromaeo- 



gnathous arrangement of the palate bones 7 



8. Foot of Upupa africana 10 



9. Upupa africana 11 



10. Tail of Irrisor viridis 13 



11. Irrisor viridis 15 



12. Wing of Cypselus africanus 20 



13. 'Foot oi Cypsekis africanus 20 



14. Cypselus africanus 22 



15. Foot of Tachornis parva 28 



16. Tail of ChcBtura stictilcema 30 



17. Foot of Caprimulgus europczus 31 



18. Caprivmlgus fossii 40 



19. Wing of Cosmetornis vexillarius 43 



20. Coracias ^nosamhicus 52 



