PREFACE 



In the following pages an attempt has been made to 

 refer to the classification and systematic position of the 

 animals with which this volume deals, without entering 

 very fully into details, and as much space as possible has 

 been devoted to their life histories and habits. 



The numerous photographs which illustrate this book 

 have all been taken by Mr. W. S. Berridge, F.Z.S., mostly 

 from living specimens in the Zoological Gardens, and 

 those who are cognizant of the art of photography will 

 fully appreciate the skill and patience involved in their 

 production. 



Many of the text figures are reproduced from the 

 works published by the Trustees of the British Museum 

 and by the Council of the Ray Society, with their kind 

 permission. 



E. G. BOULENGER. 



'/zoological Society, 



Regent's Park, 



October 1^14. 



