GREAT BLACK-BACKED GULL. _Larus marinus_ 327 Great Black-headed Gull. _Larus ichthyaëtus_ 330 BLACK-HEADED GULL. _Larus ridibundus_ 328 Little Gull. _Larus minutus_ 330 SABINE’S GULL. _Xema sabinii_ 330 COMMON SKUA. _Stercorarius catarrhactes_ 330 Pomatorhine Skua. _Stercorarius pomatorhinus_ 333 RICHARDSON’S SKUA. _Stercorarius crepidatus_ 333 Buffon’s Skua. _Stercorarius parasiticus_ 333 _Order_ TUBINARES. STORMY PETREL. _Procellaria pelagica_ 333 LEACH’S PETREL. _Procellaria leucorrhoa_ 335 Wilson’s Petrel. _Oceanites oceanicus_ 336 MANX SHEARWATER. _Puffinus anglorum_ 336 Sooty Shearwater. _Puffinus griseus_ 337 Greater Shearwater. _Puffinus major_ 337 Dusky Shearwater. _Puffinus obscurus_ 337 FULMAR. _Fulmarus glacialis_ 337 Capped Petrel. _Œstrelata hæsitata_ 339 Bulwer’s Petrel. _Bulweria columbina_ 339 _Order_ PYGOPODES. GREAT NORTHERN DIVER. _Colymbus glacialis_ 340 BLACK-THROATED DIVER. _Colymbus arcticus_ 341 RED-THROATED DIVER. _Colymbus septentrionalis_ 342 GREAT CRESTED GREBE. _Podiceps cristatus_ 342 Red-necked Grebe. _Podiceps griseigena_ 345 Sclavonian Grebe. _Podiceps auritus_ 345 Eared Grebe. _Podiceps nigrocollis_ 345 LITTLE GREBE. _Tachybaptes fluviatilis_ 344 RAZORBILL. _Alca torda_ 345 COMMON GUILLEMOT. _Lomvia troile_ 347 Brünnich’s Guillemot. _Lomvia bruennichi_ 351 BLACK GUILLEMOT. _Uria grylle_ 350 Little Auk. _Margulus alle_ 351 PUFFIN. _Fratercula arctica_ 351 INDEX 353 LIST OF ILLUSTRATIONS. _COLOURED PLATES._ GOLDEN EAGLE _By A. Thorburn_ _Frontispiece_ BEARDED TITMOUSE „ _To face p._ 89 GOLDFINCH „ „ 126 BITTERN „ „ 224