26l 



LINCOLNSHIRE NON-MARINE MOLLUSCA. 



H. WALLIS KEW, F.Z.S., 



London ; formerly of Louth, Lincolnshire. . 



Fifteen years have now elapsed since the publication of Mr. 

 Roebuck's admirable ' Materials towards a List of the Land 

 and Freshwater Mollusca of Lincolnshire,' which appeared in 

 'The Naturalist ' for August 1887. Since that time, owing- in 

 great measure to Mr. Roebuck's continued interest in the subject 

 and to the enthusiasm which he has transmitted to others, 

 important additions have been made ; and within the knowledge 

 of the present writer there are conchologists in Lincolnshire 

 who do not possess a long series of volumes of ' The Naturalist ' 

 and are thus in ignorance of the exact constituents of the non- 

 marine molluscan fauna of the county. In view of this fact it 

 seems useful to mark a list of British species to show at a glance 

 those which have, and those which have not, been found within 

 our area. This is now done, and it is hoped that its publication 

 will stimulate Lincolnshire conchologists to a more careful 

 search for such of the unrecorded species as may reasonably be 

 expected to occur, e.g., Acicula lineata, Hygromia fusca, Azeca 

 tridens, Vertigo antivertigo, etc. As a further encouragement it 

 may not be improper to say that Mr. Roebuck hopes to give, at 

 a future date, a new and full account of the subject, with all 

 necessary details of localities, and proper acknowledgments of 

 the work done by each collector. 



In addition to the unequivocal land and freshwater mollusca, 

 the present list is made to include Assiminea, Paludestrina, and 

 all the British Pulmonata, although some of these are in a 

 certain sense marine, living in more or less brackish water, or 

 leading a semi-terrestrial existence under the influence of the 

 sea. A few species which do not belong to our fauna, but 

 which have established themselves in our midst, are also 

 included ; but, on the other hand, certain forms — somewhat 

 recently described or brought forward as British — about the 

 status of which difference of opinion is understood to exist, are 

 omitted. In this way we arrive at a total of 149 species; and 

 of this number no have already been found in Lincolnshire. 

 The vast majority of the specimens have been collected by 

 Mr. Roebuck himself, or submitted by their tinders to the 

 referees of the Conchological Society as formerly constituted at 

 Leeds; and in all cases where the contrary is not indicated 



1902 August 1. 



