vi OSTEOLOGIA AVIUM. 



CHAPTER II. 



The following arrangement of Birds was proposed by me, with some modifications, at 

 the Leeds Meeting of the British Association for the Advancement of Science; it is 

 founded almost entirely on osteological characters, which it is the object of this work 

 to illustrate, without any bias towards any preconceived theory ; and should I at any 

 time, in the acquisition of new materials, see reason for its alteration, I shall make the 

 necessary changes with the greatest pleasure. I have endeavoured to divide the Class 

 into Orders in such a manner that distinct osteological characters shall be observable 

 between them, which it would be useless to mention here, as they will be treated of in 

 detail hereafter ; it will be instructive, however, to examine how far the general habit 

 of each Order agrees with the following arrangement : — 



CLASS II. AVES. 



Order I. RAPTORES. 



Earn. 1. VuLTURiDiE. Earn. 2. Falconid^e. 



Earn. 3. Strigid^e. 



Order II. VOLITORES. 

 Earn. 1. Trochilid^e. Earn. 2. Cypselid^e. 



Order III. OMNIVORES. 



Earn. 1. Caprimulgid,e. Earn. 3. Alcedinid^e. 



Earn. 2. Trogonid^e. Earn. 4. BucERiDiE. 



Order IV. PREHENSORES. 

 Fam. 1. PsiTTACiDiE. Earn. 2. Rhamphastid^e. 



Order V. SCANSORES. 

 Earn. 1. PiciDiE. 



Order VI. ERUCIVORES. 



Fam. 1. CuculidjE. Fam. 2. Musophagid^e. 



