PLATE 10. 



HERRING GULL. 

 (Seef. 169.) 





BLACK-HEADED GULL. KITTIWAKE. 



(See f. 160.) (See p. 206.) 





GREAT BLACK-BACKED GULL. 

 (.See p. 166.) 



NOTE. In re/erring to the eggs the above names should be read from lejt to right. 



