THE LAND AND FRESH WATER SHELLS OF 

 GUERNSEY. 



BY ME. E. D. MAEQUAND, PRESIDENT. 



So little appears to be known concerning the Land and Fresh 

 Water Mollusca of this island, and the published information 

 is so scanty, that I venture to think the following list, though 

 incomplete, will supply a want, and perhaps serve to direct 

 attention to a subject which will repay investigation. After 

 much consideration I have thought it best to restrict this list 

 to species which I have myself seen and can vouch for ; but 

 at least two others have been found in Guernsey, Helix rupes- 

 tris and Bulimus obscurus, and our resident conchologists 

 should do their best to turn them up. 



Two shells deserve mention, although they have no claim 

 to a place in the present list. In a small fish-pond at St. 

 George may be seen Planorbis corneus in numbers ; they are 

 the progeny of a few English specimens introduced into the 

 pond some years ago by the proprietor, as he himself has 

 informed me. The second species is Planorbis parvus, which 

 occurs plentifully in an artificial pond in Mr. Dawber's garden 

 at Ruettes Brayes. Waterplants of many kinds, both British 

 and exotic, have from time to time been grown in this little 

 reservoir, and it is probable that the shells have been intro- 

 duced in this way. 



The slugs are entirely omitted for the present, as they 

 require further working up, especially with respect to the 

 distribution of the rarer varieties and forms. As regards the 

 names, some of which will be unfamiliar to many conchologists, 

 I have followed the last edition (1892) of the Conchological 

 Society's " List of British Land and Fresh Water Mollusca "; 

 the more commonly known names being given in brackets 

 when necessary. 



It gives me great pleasure to acknowledge my indebted- 

 ness to Miss M. Dawber, who has assisted me both in the 

 collection of specimens, and also in ascertaining the general 

 range and comparative frequency of the species now recorded. 



