144 ornithologist's text-boo£. 



III Fam. Alcadae. — Uria, Cephus, Mergulas, 

 Phaleris, Fratercula, Alca, Spheniscus, Catarr- 

 hades, Aptenodytes. 



IV Fam. Pelecanidse-. — Onocrotalus, Phalacro- 

 cor ax, Sit la, Tachy petes, Phaeton, Plot as. 



V Fam. Laridae. — Sterna, Rhynchops, Larus, 

 Stercorarius, Diomedea, Haladroma, Procellaria, 

 Pachyptila, Puffinus, Thalassidroma. 



5 orders, 5 tribes, 45 families, 60 subfamilies, 

 404 genera. 



