448 



74. Anas. Bill broader than high, depressed ; teeth 

 long, lamelliforra ; hind toe simple. 



75. Fuligula. Bill broader than high, depressed ; teeth 



lamelliform ; hind toe lobated. 



76. Mergus. Bill slender, hooked ; teeth subulate. 



Family Steganopodes. 

 * Bill seamed above. 



77. Pelecanus. Bill much depressed ; edges entire. 



78. Phalacrocorax. Bill cylindrical, hooked; edges 

 entire, feet entirely palmated ; outer toe longest ; tail 

 rounded. 



7 ( J. Tachypetes. Bill cylindrical, both mandibles hook- 

 ed, edges entire ; feet semipalmated ; middle toe much 

 the longest ; tarsi feathered ; tail forked. 



80. Sula. Bill stout, straight, compressed; ed^es serrated. 



** Bill not seamed. 



81. Phaeton. Bill cultrate; edges serrated; face 

 feathered. 



82. Plotus. Bill subulate ; edges serrated ; face naked. 



83. Heliornis. Bill subulate ; edges entire ; face 



feathered. Toes lobated, lobes scalloped, connecting 

 membrane rudimentary. 



Family Pygopodes. 



* Four-toed. 



84. Podiceps. Toes lobated : lora naked ; no tail. 

 S5. Colymbus. Toes palmated : lora feathered. 



** Three-toed. 



86. Uria. Bill nearly straight, pointed : nostrils half 

 closed by a feathered membrane. 



