IV 



PEEFACE. 



known to the authors, which, it is hoped, will greatly increase the value of the volume 

 as a work of reference. 



In conclusion, the authors have to record their best thanks to Dr. William Peters, 

 Director of the Royal Zoological Museum of Berlin, and to the authorities of the 

 Jardin des Plantes of Paris, and of the Norwich and Norfolk Museum, who have most 

 liberally allowed some of their rarest specimens to be removed to London for the use 

 of the present work, as well as to other kind friends who, as will be seen by references 

 in the following pages, have favoured them with the loan of specimens and with useful 

 information upon different points. 



P. L. SCLATER. 



0. SALYIN. 



London, November, 1869. 



