PLATE 11. 



-ESSER BLACK-BACKED GULL. 



(See p. 172.) 



COMMON GULL. RICHARDSON'S SKUA. 



(See p. 16?.) (See p. 364.) 





COMMON SKUA. 



{.See p. 361.) 



NOTE. /H referring lo the eggs the above names should be read from left tv right. 



