PREFACE. ix 



by no means thought to be limited to the statements 

 with which his name will be found to be connected ; 

 indeed, I owe him more than I can well express. 



I have been careful to acknowledge the source 

 whence the illustrations are taken, and I have to 

 return my thanks to the Publication Committee of 

 the Zoological Society ; to Professor Flower, who 

 only added one more to a number of acts of personal 

 kindness when he generously put at my disposal all 

 the wood-blocks which were in his own possession ; 

 and to those other friends who have allowed me to 

 copy figures from their works. 



As this manual is written on lines that are rarely 

 followed, I shall be greatly obliged for any suggestions 

 as to its improvement, or for corrections of any errors 

 which may have found their way into it. 



F. JEFFKEY BELL. 



King's College, May, 1885. 



