TmS BOOK IS AFFECTIONATELY DEDICATED TO 



Dh. J. A. ALLEN 



WHO, THROUGH HIS PKOFOUND KNOWLEDGE, UNSELTISH 

 DEVOTION TO SCIENCE, AND NEVER-FAILING 8TMPATHT 

 WITH TOUNGEH STTIDBNTS OP ZOOLOGY HAS 

 BEEN AN EXAMPLE AND AN INSPIRATION DURING 

 THE TEARS I HAVE WORKED AT BIS BIDE. 



