AQULHENTICATED RECOKDS 
ie 
THE? DISTRIBUTION 
OF THE 
BRITISH LAND AND’ FRESHWATER 
NIGH USC A: 
I am indebted to Mr. W. Denison Roebuck, F.L.S., 
recorder to the Conchological Society for many years, 
for the following tables showing the counties and vice- 
counties of the British Islands from which specimens 
have been submitted to the society’s referees for 
authentication. 
The great merit of the system of authentication is 
the uniformity of value which it gives to the records ; 
and the fact that the vast majority of the species whose 
distribution is indicated in the following tables have 
been submitted to, and verified by, so high an authority 
as Mr. John W. Taylor, F.L.S., renders this table: of 
great value. The few that have not been seen by Mr. 
Taylor rest upon the authority of the late Mr. Charles 
Ashford, whose great reliability and accuracy as a 
