If the reader remember the name of the Author of a paper on a 

 given subject, he will probably find it convenient to refer to the 

 Authors' Catalog-ue rather than to the Subject Catalogue. 



In the Authors' Catalogue the four-fig-uro numbers placed within 

 square brackets at the end of each entry are Registration numbers, 

 and serve to indicafe the scope of each paper indexed. The meaning 

 of these numbers will at once be found by reference to the Schedule. 



In case the abbreviated titles of Journals are not understood, a key 

 to these is provided at the end of the volume. 



Lists of new species are appended to each of the main divisions of 

 Taxonon\y, Nos. 5400 — 7900. In these lists the name of the species 

 is followed by the immber of the paper as given in the Authors' 

 Catalogue 



GEOGRAPHICAL SYMBOLS. 



Wheii one or two letters printed in italics immediately follow the 

 Registration number, these letters denote geographical position. The 

 meaning of these geographical symbols will be found in the system of 

 Topographical Classification, which, in this volume, is printed in four 

 languages, and placed between the Schedules and Indexes and the 

 Authors' Catalogue. Thus de means " occurring in Great Britain " or 

 " with reference to Great Britain." 



