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. Diomedea. 
Family Lamellosodentat 
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. 
