21 



Sterna fliiviatilis, Naum. 



Common Tern. 

 MoK Wennol Ysgbaell. 



Sterna macrura, Naum. 

 Arctic Tern. 



YSGRAELL Y GoGLEDD. 



Sterna mimifa, Linn. 

 Little Tern. 



MonwENNOL Leiaf. 



Subfamily Larin^. 



Larus minutus, Pall. 

 Little Gull. 



Y Wylan Leiaf. 



Larus ridibundns, Linn< 



Black-headed Gull. 

 Gwylan Benddu. 



Larus canus, Linn. 

 Common Gull. 



Y ^YYLAN GyFFREDIN. 



Larus argentatus, Gmel. 



Herring Gull. 

 Gwylan y Penwaig. 



Larus fuscus, Linn. 



Lesser Black-backed Gull. 



GWTLAN Gefnddu Leiaf. 



Ljarus ?narinus, Linn. 



Great Black-backed Gull, 



GwvLAN Gefnddu Famr. 



liissa tridactyla, Linn. 



Kittiwake. 

 Gwylan Benwen. Gwylan Gernyw, 



Subfamily Stercorariin.e. 



Stercorarius catarrhactes, Linn. 



Great Skua. 

 Gwylan Lwyd-ddu. 



