BY 



W. H. HUDSON, C.M.Z.S. 



WITH A CHAPTER ON STEUCTUEE AND CLASSIFICATION 

 BY FEANK E. BEDDABD, F.B.S, 



With 8 Coloured Platet from Original Drawings by A. Thorburn 



and 8 Platet and 100 figures in black and white from Original Drawings by 0. E. l.odg 

 and 3 Illustrations from Photographs from Nature by R. B. Ledge 



NEW IMPRESSION 



LONGMANS, GEEEN, AND CO. 



39 PATEENOSTEE BOW, LONDON 



FOURTH AVENUE & 30TH STREET, NEW YORK 

 BOMBAY. CALCUTTA, AND MADRAS 



1921 

 All rightt reserved 



