LIST OF ILLUSTRATIONS IN THE TEXT 



ILLUSTRATION PAOE 



1. Diagrams Illustrating the Structure of a Feather. (After 

 Pycraft) 6 



From The Book of Nature Study. 



2. Contour Feathers (Pheasant and Emu) showing the Hypo- 



RHACHis OR After-shaft. (After Pycraft) 8 



From The Book of Nature Study. 



3. A Developing Filoplume showing the Rami which later dis- 

 appear, and the Main Shaft which remains to form the 



" Filoplume ". (After Pycraft) 10 



From The Transactions of the Linnean Society. 



4. Pterylosis of Acanthidositta chloris showing the Feather 

 Tracts. (After Pycraft) 13 



By permission of the Editors of The Ibis. 



5. Wing of a Bird, Slightly Diagrammatic, to show the Arrange- 

 ment OF the " Quill " or " Flight-feathers ". (After Pycraft) - 13 



6. Dissection showing the Lungs and Air-sacs of a Bird. (After 



Strasser) 18 



7. Types of the C.«ca, or Blind Gut, of Rhea, Owl and 

 Martineta Tinamou -----23 



By permission of the Editors of The Ibis, and of the Zoological Society. 



8. Skulls of Nestling Penguin and Emu to show the Sutures 

 Dividing the Separate Elements of the Cranium - - - 31 



From Specimens in the British Museum of Natural History. 



9. Hip-girdles of a Dinosaur, an Embryo Bird and a Nestling 

 Emu. (After Marsh) 33 



10. The End of the Shank and Middle Bones of the Foot (Tarso- 

 metatarsus) of a Young Bird Compared with the same 

 Bones in an Adult Reptile (Dinosaur). (After Marsh) - 34 



11. The Skeletons of Two Extinct Fossil Birds, Hesperornis 



and Ichthyornis 36 



12. One of the Pro-Aves. (After Pycraft) 39 



13. Restoration of Arch^opteryx. (After Pycraft) - - - - 42 



XV 



