i:n^trodu€tory n^ote. 



In prepariug the following catalogues chronologic order has been 

 followed under the different authors,'and in Part IV the fifteen dif- 

 ferent authors are arranged, first, alphabetically and then chronologically 

 under each author. Correctness of bibliographic form and detail has 

 n«tt been so much sought after as completeness and accuracy in the 

 numerous references. A general alphabetic index of species will be 

 f(.und at the end of the volume. The compiler will be glad to have his 

 attention called to any errors or omissions. Dr. White's bibliography 

 is prepared from data furnished by himself. I am much indebted to 

 Dr. White for his kind advice and help.in the preparation of the work. 



