BUTTERELL : THE MOLLUSCA OF BEVERLEY. 293 



Physa hypnoriim Lin. Drift Beverley Beck, Cherry-tree Lane, 

 Kitchen Lane and Commonbank Nook: not common, 

 disappears at times. 



P. fontinalis Lin. Very abundant but mostly small, the frequent 

 cleansing of the ditches preventing its arrival at maturity. 

 Figham, Swinemoor, Long Lane and Leckonfield Moat; 

 from the last named locality I took one specimen with 

 the foot bifid behind, and another in which the foot 

 measured close upon an inch in length. 



Limnsea peregra Mull. Common and abundant everywhere: 

 fine in Leckonfield Moat and ditch in Long Lane : spire 

 short and mouth wide at Figham and in Pighill Lane. 



L. auricularia Lin. Leven Canal. 



L. stagnalis Lin. Occurred formerly at Figham, but dead shells 

 only now to be found. In Risby Fishpond very spar- 

 ingly; one specimen from this locality measures two 

 inches in length. 



L. palustris Mull. Locally abundant but by no means a 

 common species here; varies in different localities, and 

 it is possible some of the varieties occur. Long Lane, 

 Swinemoor, Cottingham and Pighill, where it appears to 

 prefer mud to water and resembles L. tmjicatiila in its 

 habits, Figham. Pond in field beyond Kitchen Lane, 

 and Commonbank Nook: abundant. 



L. truncatula Mull. Swinemoor, Figham, Leckonfield Park, 

 Kitchen Lane, and on the muddy banks of the River 

 Hull in countless numbers, generally small. 



L. glabra Mull. Plentiful in a pond near Leckonfield Moat. 



Ancylus lacustris Lin. Leven Canal and Leckonfield Moat: 

 fine and moderately abundant. 



