12 Field Museum of Natural History — Zoology, Vol. XIII. 



Order Colymbiformes. 

 Family Gavidae — Loons. 



Order Sphenisciformes. 

 Family Spheniscidae — Penguins. 



Order PROCELLARIIFORMES. 

 Family Procellariidae — Petrels, Shearwaters, etc. 

 " Pelecanoididae — Diving Petrels. 

 " Diomedeidae — ^Albatrosses. 



Order ALCIFORMES. 

 Family Alcidae — ^Auks and Puffins. 



Order Lariformes. 



Family Stercorariidae — Jaegers and Skuas. 

 " Laridae — Giills and Terns. 

 " Rhynchopidae — Skimmers. 



Order Charadriiformes. 

 Suborder Chionides." 

 Family Chionidae — Sheath-bills. 



Suborder Attagides. 

 Family Thincorythidae — Seed Snipes. 



Suborder Charadrii. 

 Family Phalaropodidae — Phalaropes. 



Recurvirostridae — Stilts and Avocets. 

 Scolopacidae — Snipes and Sandpipers. 

 Charadriidae — Plovers . 

 Aphrizidae — Turnstones and Surf -birds. 

 Oedicnemidae — Thick-knees. 

 Haematopodidae — Oyster Catchers. 



Suborder Jacanae. 

 Family Jacanidae — Jacanas. 



Order GRUIFORMES. 

 Suborder Grues. 

 Family Gruidae — Cranes. 



