447 ' 



ORDER ANSERES. 



Family Longipennes. 



* Bill of one piece : nostrils immarginate : 4-toed. 



64. Rhincops. Lower mandible much longer than the 

 upper, truncated. 



65. Sterna. Bill subulate, straightish, compressed, acute. 



66. Larus. Upper mandible hooked. 



** Upper mand. seamed : nostrils immarginate: 4-toed. 



67. Lestris. Upper mandible hooked, covered at base 



with a cere. 



*** Both mandibles seamed : nostrils tubular : 4-toed. 

 A. Hind toe only a sharp nail. 



68. Thalassidroma. Bill weak, both mandibles curved ; 

 nostrils united in a common tube; second and third 

 primaries longest. 



69. Procellaria. Bill robust, lower mandible trunca- 

 ted ; nostrils in a single tube : first primary longest. 

 Tail of fourteen feathers. 



70. Puffinus. Both mandibles strongly curved : opening 

 of the nostrils distinct. 



B. No hind nail. 



71. DlOMEDEA. 



Family Lamellosodentati 



72. Anser. Bill higher than broad, stout, conic ; teeth 

 short, conic-acute ; lora feathered. 



73. Cygnus. Bill at base higher than broad, depressed ; 

 teeth laminar ; lora naked. 



