Clare Island Surrey — Land and Fresh-water Mollusca. &3 - r >3 



The shells obtained in the samples of marl were : — Limnaea pereger. 

 L. palustris, L. stag?utlis, ValvatcC cristata, Bithynia tentaculata, and Pisidium 

 pusillum. 



Of these last only a single specimen of L. palustris was found, in a sample 

 from a depth of 2 feet ; one each of V. cristata and L. stagnalis (very young), 

 at a depth of 5 feet ; while the remaining species were common in all the 

 samples taken. 



At least fifteen per cent, of the shells collected in the flood debris of the 

 lake belonged to V. piscinalis ; yet the species did not appear in any of the 

 samples of the marl examined. 



As no great change in the fauna appears to have taken place in the 

 district, comments on the above lists are unnecessary ; and the fact that certain 

 species were present in the drifted material and yet absent from the samples 

 of marl may be due to chance. 



The fauna represented in the combined lists would be typical of that 

 found living in many small lakes in this district, but the apparent absence of 

 Sphaerium corneum, Physa fontinalis, and Pisidia (other than P. •pibsillum) is 

 strange. 



[Table of Distribution. 



