CONTENTS. XXIX 



Page 

 Subfamily LAEIN^ 186 



Genus Paqophila 186 



Pagopliila eburnea. Ivory Gull 186 



Genus RisSA 187 



Kiasa tridactyla. Kittiwake 187 



Genus Labus 187 



Larus glaucus. Glaucous Gull 187 



Larus leucopterus. Iceland Gull 188 



Larus argentatus. Herring-Gull 188 



Larus fuscus. Lesser Black-backed Gull 189 



Larus canus. Common Gull 189 



Larus marinus. Greater Black-backed Gull 189 



Larus atricilla. Laughing Qull 190 



Larus ichthyaetus. Great Black-headed Gull 190 



Larus melanocephalus. Adriatic Qull 191 



Larus ridibundus. Black-headed Gull 191 



Larus minutus. Little Gull . . r 191 



Larus Philadelphia. Bonaparte's Otdl 192 



Genus Rhobostethia 193 



Rhodostethia rosea. Cuneate-tailed Gidl 192 



Genus Xema 193 



Xema sabinii. Sabine's Gull 193 



Subfamily STEECORARIINiB 193 



Genus SxEBCOBAEitrs 193 



Stercorarius catarrhactes. Common Skua 194 



Stercorarius pomatorhinus. Pomatorhine Skua 194 



Stercorarius crepidatus. Richardson's Skua 195 



Stercorarius parasiticus. Buffon's Skua 195 



Order TTJBINARES 199 



Family PfiOCELLARIID^ 196 



Genus Peocbllaeia 196 



ProoeUaria pelagica. Storm-Petrel 196 



Procellaria leucorrhoa. Leach's Petrel 196 



Genus Oceanitbs 197 



Oceanites oceanicus. Wilson's Petrel 197 



