22 



Stercorarius crepidatifs, Gmel. 

 Arctic or Richardson's Skua. 



GWYLAN DROED-DUU. 



Order PYGOPODES. 



Family ALCID.E. 



Alca torda, Linn. 



Razoi'bill. 

 Llursen. Carfil Gylfin Dd. 



Una troile, Linn. 

 Guillemot. 



GWILYM. GWYLOG. MoRIAB. 



Merrfulus alle, Linn. 



Little Auk. 

 Carfil Bach. 



Fratercnla arctica, Linn. 



Putlin. 

 PwFFiN. Pal. 



Family COLYMBID.F:. 



Colynibus gladalis, Linn. 



Great Northern Diver. 

 Trochydd Mawr. 



Colyvihus sejytentrionalis, Linn, 



Red-throated Diver. 

 Trochydd Brith Gwddwgoch. 



Family PODICIPEDID.^l 



Podicipes cristatits, Linn. 

 Great Crested Grebe. 



GWYACH GORKIOG. 



Podicipes aurifus, Linn. 

 Sclavonian Grebe. 



GWYACH GlUSTIOG. 



