Ixii PRELIMINARY SKETCH OF THE 



The second class, Aves, is divided into six 

 orders, the distinctions of which are taken 

 chiefly from the beak ; but in some Linnaeus 

 found it necessary to call in the tongue, nostrils, 

 and in some cases the feet and other parts. 



Order I. — Accipitres, Hooked bill, the su- 

 perior mandible near the base being extended 

 on each side beyond the inferior; in some 

 it is armed with indentations resembling teeth ; 

 four genera : Vultur, Falco, Strix, Lanius. 



Order II.— Piece. Beak somewhat compressed 

 and convex ; twenty-three genera : Trochilus, 

 Certhia, Upupa, Glaucopis, Buphaga, Sitta, 

 Oriolus, Coracias, Gracula, Corvus, Paradisea, 

 Rhamphastos, Trogon, Psittacus, Crotophaga, 

 Picus, Yunx, Cuculus, Bucco, Buceros, Alcedo, 

 Merops, Todos. 



Order III. — Anseres. Smooth beak, broadest 

 at point, covered with a smooth skin, and den- 

 ticulated ; tongue fleshy ; toes palmate ; thir- 

 teen genera: Anas, Mergus, Phaeton, Plotus, 

 Rhyncops, Diomedea, Aptenodyta, Alca, Pro- 

 cellaria, Pelicanus, Larus, Sterna, Colymbus. 



Order IV. — Grallce. Beak somewhat cylin- 

 drical ; tail short ; thighs marked ; four-toed ; 

 twenty -two genera: Pbaenicopterus, Platalea 

 Palamedea, Mycteria, Tantalus, Ardea, Corrira, 



