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PRESIDENTIAL ADDRESS 
TO THE 
LINCOLNSHIRE NATURALISTS’ UNION, 1910, 
BY 
W. DENISON ROEBUCK, F.L.S. 
On coming to the end of my second year of office as your 
President, I have to thank you very much for an honour which I 
most highly appreciate. 
In my previous address last year I reviewed the state of our 
knowledge as regards the Land and Freshwater Mollusca of our 
county, and the work upon that subject which is in course of 
preparation, and which, during the coming year, is intended to 
be prepared for early publication. 
Special attention has been paid during the year, not only by 
myself, but by Mr. Musham and Mr. Smith, to working up the 
most neglected areas—and the MHolbeach, Long Sutton, 
Crowland, Stamford, Axholme, and Horncastle districts have 
been energetically worked with good results. 
In that address I drew attention to three species, the records 
of which needed confirmation, and two of these have been found. 
One of them, Zonitoides excavatus, has been on record a long 
time, as found by Mr. F. W. Fierke at the Woodhall Spa 
excursion of the Union in one of its earliest years of existence. 
The confirmation came from the adjoining division, specimens 
occurring to Mr. Musham and myself in Tumby Wood. 
The confirmation of the other species, its first discovery, 
and the subsequent investigation of its habitat, have proved one 
of the most interesting pieces of work done for a long time. 
