LIST or TEXT-FIGURES. 



List of Text- Figures. 



Page 



1. Embryo of Chionarchus minor to show the distribution of 



the down- and feather-tracts 131 



2. Half-fledged nestling of Chionis aiha 134 



3. Dorsal view of the skulls of Chionarchus crozettensis, C. 



minor, and Chionis alba 142 



4. Palatal views of the skulls of Chionis alba, Stercorarius 



crepidatus, and Larus canus 146 



5. Diagram showing the inter-relation of certain groups of 



Petrel parasites 260 



6. Transitional nestling tongues of Prinia mystacea and 



Cisticola clnerascens 293 



7. Portion of the skull of an embryo Chionarchus " minor " 



from Kerguelen 314 



8. Dorsal view of a young Crab- Plover to show the feather- 



tracts 322 



9. Skull of Dromas viewed from behind 324 



10. Dorsal view of the skulls of Dromas ardeola and Larus 



canus 326 



11. Palatal view of the skull of Dromcfs arrfeoZa .... 330 



12. Heads of a young example of Tachyeres cinereus, and of 



male and female T. patachonicus 489 



