XI 
EXPLANATORY. 
This Volume is printed in twenty Divisions, as enumerated on p. xii. 
The pagination of each Division is separate, and is given at the 
left-hand top corner of the pages. The number and name of the 
Division is given as a heading on each left-hand page. The Registra- 
tion Numbers are given at the right-hand top corner of the right- 
hand pages. The date 1906 corresponding to the bulk of the 
literature indexed is given at the right-hand top corner of the left- 
hand page. 
In the Subject Index of each Division authors are quoted by name 
only. The full references will be found in the Title Section of the 
Division. 
Where several papers by the same author are indexed they are 
numbered consecutively. 
A List of Abbreviations of Titles of Journals is given at the end of 
the volume. This List includes not only journals actually indexed in 
this volume, but also journals that have been indexed in previous 
volumes. It should therefore be a fairly complete List of Journals 
that contain Zoological papers. 
The Literature indexed is mainly that of .1906 but includes entries 
for 1901-1905 that have been received too late for inclusion in 
previous volumes of the International Catalogue. 
The two title-pages show that Volume N (Zoology) of the Sixth 
annual issue of the International Catalogue of Scientific Literature and 
Volume XLIII of the Zoological Record are identical. 
The proposal for an amalgamation of the Zoological Record with 
Volume N of the International Catalogue was approved by the Inter- 
national Convention which met in London in July, 1905. The agree- 
ment concluded with the Zoological Society of London provides that 
the amalgamation shall be for a period of five years, covering the 
literature of 1 906—1 910 ; at the end of this period each party to the 
agreement may resume the independent issue of its anuual volumes, 
preserving the continuity Qf its series. 
Subscribers to the Zoological Record will receive the volumes 
bound uniformly with previous volumes of the Record, while sub- 
scribers to the International Catalogue will receive their volumes in 
covers uniform with other volumes of the Catalogue. 
The Schedules of Classification are bound up with the volumes in- 
tended for subscribers to the International Catalogue, but are absent 
from the volumes bound uniform with the Zoological Record. 
The volume is arranged in accordance with these Schedules, but 
in one or two instances, notably in the case of Section XII Insecta, 
the Editor has adopted a modified arrangement. 
