74 Appendix. 



to the translation of which these latter pages form an appendix, together with the observations 

 of later authors, makes it evident that of the whole Order the Eurylaemidae are the least specialized, 

 so that they can hardly form other than a main division by themselves. Of the remainder Pitta, 

 Rupicola, the Tyrannidae, the Tracheophonae together with the Pipridae and Cotingidae constitute a 

 section for which I have suggested the name Mesomyodae in contrast to the Acromyodae (or 

 Oscines), in which latter the syiiugeal muscles are inserted into the extremities of the bronchial 

 semi-rings. 



There is every reason for hope that by continued investigation into the osteology of the 

 Passeres, so ably commenced by Professor Parker, and into the structure of their soft parts, the 

 acute discrimination evinced by those who study skins alone in the determination of generic 

 relations will be supplemented by an amount of information with reference to the affinities of the 

 families which will before long lead to a correct estimate of the true classification of the 

 order. 



In conclusion it must be mentioned that this appendix is an incorjooration of matter published 

 in the Proceedings of the Zoological Society of London between the years 1873 and the present 

 time ; and that those new facts which its author has been able to bring forward are based upon 

 specimens which he has had the oppoi-tunity of examining in his capacity of Prosector to the 

 Zoological Society, as well as upon an extensive series of birds in spirit, most kindly placed at his 

 disposal by Mr. Osbert Salvin. To Mr. P. L. Sclater the editor is also greatly indebted for 

 information and advice ou many points connected with the above investigation as well as for 

 bis kindness in revising the proofs of this work. 



A. H. GAIUIOU. 

 June 18th, 1878. 



