2g 



REPORT ON THE ACCELERATION OF THE CENSUS 



IN 1909. 



At the beginning of the year an effort was made to accelerate the completion of 

 the Census, to which appeal conchologists very generously responded. 



A circular was printed and sent out by Mr. W. Denison Roebuck, of Leeds, in 

 conjunction with the Official Recorder. 



One side of this circular contained a list of British Land and Freshwater 

 Mollusca, for the purpose of indicating the blanks to be filled up for a particular 

 county, and the other side contained lists of the counties and vice-counties for 

 indicating the blanks to be filled up for a particular species. 



About 150 of tliese circulars were sent out, and the result — thanks to the active 

 and hearty co-operation of British conchologists — has been eminently satisfactory. 



No fewer than 1213 of the blanks have been filled up for 106 counties and vice- 

 counties, and the total number of authentications on the books now amounts to 

 9790, averaging 657 per cent, of species authenticated for each county or vice- 

 county. 



The amount of the work done may be further appreciated, when it is ])orne in 

 mind that the blanks filled up by the special effort this year amount to about an 

 eighth part of the total number of authentications accumulated during a quarter of 

 a century's steady work. 



The following is a list of the vice-counties of the British Isles, showing the 

 present state of the authentication-records — both the 1909 additions and the total 

 to date. The counties are arranged in the order in which they have been least 

 investigated. 



