XXXll 



SYSTEMATIC INDEX. 



Podiceps 403 



Heliornis 404 



Mergus 404 



Uria 405 



Cephus 405 



Alca 406 



JPratercula 406 



Alca proper 406 



Aptenodytes 407 



Aptenody tes proper 407 



Catarrhactes 407 



Spheniscus 408 



LONGIPENNES 408 



Procellaria 408 



Procellaria proper 409 



Puffinus 410 



Halodroma 410 



Pachyptila 410 



Diomedea 411 



Larus 411 



Goelands 412 



Mauves 412 



Stercorarius 413 



Sterna 413 



Noddies 415 



Rynchops 415 



TOTIPALMAT^ 415 



Pelecanus 416 



Pelecanus proper 416 



Phalacrocorax 416 



Tachypetes 417 



Sula 417 



Plotus 418 



Phaeton 418 



LAMELLIROSTRE^ 419 



Anas ' 419 



Cygnus 419 



Anser 421 



Auser proper 421 



Bernacles 421 



Cereopsis 421 



Anas proper 422 



Oldemia 423 



Clangula 423 



Somateria 424 



Rynchaspis 426 



Tadorna 426- 



Mergus 428 



