c 



Plate 27 



1. Ring-billed Gull 



2. Ring-billed Gull ? 

 Red-legged Kittrwake 

 Black-legged Kittiwake 

 Black-legged Kittiwake ? 

 Mew Gull <* 



Mev Gull ? 

 Ivory Gull ? 



3. 

 U. 



5. 

 6. 



7. 

 8. 



9. Ivory Gull <t 



9. 



