65. _Certhia_, creeper. Beak arcuate, slender, acute: 25 species. 66. _Trochilus_, humming-bird. Beak slender, longer than the head, its tip tubular: 22 species. _Order III._ ANSERES. 67. _Anas_, swans, geese, and ducks. Beak lamellated at the margin, convex, obtuse: 45 species. 68. _Mergus_, merganser. Beak denticulate, cylindrical, the tip hooked: 6 species. 69. _Alca_, auk. Beak short, compressed, convex, furrowed; the lower mandible with a prominent angle: 5 species. 70. _Procellaria_, petrel. Beak a little compressed; the upper mandible hooked, the lower channelled and compressed at the tip: 6 species. 71. _Diomedea_, albatross. Beak straight; upper mandible hooked at the tip, lower abrupt: 2 species. 72. _Pelecanus_, pelican, gannet, shag. Beak straight, the tip hooked, unguiculate: 8 species. 73. _Plotus_, darter. Beak straight, sharp pointed, denticulate: 1 species. 74. _Phaeton_. Beak cultrate, straight, acuminate: 2 species. 75. _Colymbus_, diver. Beak slender, straight, sharp pointed: 11 species. 76. _Larus_, gull. Beak straight, cultrate, the tip a little hooked; the lower mandible with an angular prominence: 11 species. 77. _Sterna_, tern. Beak slender, nearly straight, acute, compressed: 7 species. 78. _Rynchops_, skimmer. Beak straight; upper mandible much shorter, lower abruptly terminated: 2 species. _Order IV._ GRALLAE, Waders. 79. _Phoenicopterus_, flamingo. Beak incurvated as if broken, denticulate; feet webbed: 1 species. 80. _Platalea_, spoonbill. Beak flattish, the tip dilated, rounded, and flat: 3 species. 81. _Palamedea_, screamer. Beak conical; the upper mandible hooked: 2 species. 82. _Mycteria_, jabiru. Beak acute; lower mandible trigonal, ascending; upper three cornered, straight: 1 species. 83. _Cancroma_, boatbill. Beak bulging; the upper mandible resembling a boat with the keel uppermost: 2 species. 84. _Ardea_, cranes and herons. Beak straight, acute, long, a little compressed, with a furrow from the nostrils to the tip: 26 species. 85. _Tantalus_, ibis. Beak long, slender, arcuate; face bare: 7 species. 86. _Scolopax_, snipes, curlews. Beak long, slender, obtuse; face feathered: 18 species. 87. _Tringa_, sandpiper. Beak roundish, as long as the head; nostrils linear; feet with four toes: 23 species. 88. _Charadrius_, plover. Beak roundish, obtuse; feet with three toes: 12 species. 89. _Recurvirostra_, avoset. Beak slender, recurved, pointed, the tip flexible: 1 species. 90. _Haematopus_, oyster-catcher. Beak compressed, the tip wedgeshaped: 1 species. 91. _Fulica_, coot. Beak convex; upper mandible arched over the lower, which has a prominent angle: 7 species.