292 BUTTERELL: THE MOLLUSCA OF BEVERLEY. 



Neritina fluviatilis Lin. Barmston Drain: abundant in the 



River Hull at Grovehill, where the specimens are thickly 



encrusted with a calcareous deposit. 

 Bythinia tentaculata Lin. Abundant & generally distributed: 



Leven Canal, Figham, River Hull, Leckonfield Moat, 



Long Lane (fine) and Swinemoor. 



B. Leach ii Shep. Ditch parallel with Leven Canal, Figham: 

 scarce. 



Valvata piscinalis Mull. Leven Canal, Swinemoor, Figham 



and River Hull: moderately abundant. 

 V. piscinalis var. acuminata Jeff. In the Drift Bevei ley Beck 



and the Beverley and Barmston Drain, Figham. 



V. cristata Mull. Leven Canal, Leckonfield Moat and Drift 

 - Beverley Beck. 



Planorbis nitidus Mull, (not lineatus). Leckonfield Moat: 

 sparingly. 



P. nautileus Lin. Ditch bordering Swinemoor. 



P. nautileus van cristata Drap. Ditch bordering Swinemoor: 

 with the type, abundant. 



P. albus Mull. Leven Canal, Swinemoor and Drift Beverley 

 Beck: moderately plentiful. 



P. spirorbis Mull. Swinemoor, Leckonfield, Drift Beverley 

 Beck, Long Lane and Kitchen Lane: abundant. 



P. vortex Lin. Figham and Drift Beverley Beck: not common. 



P. carinatus Mull. Leven Canal, Figham and Leckonfield 

 Moat: local and not plentiful. 



P. connplanatus Lin. Everywhere common: Swinemoor, Fig- 

 ham, Leckonfield, Long Lane (fine), Kitchen Lane, 

 Weel Carrs and Commonbank Nook. 



P. corneus Lin. Swinemoor, Figham and Long Lane (fine). 



P. contortus Lin. Swinemoor, Figham, Drift Beverley Beck, 

 Kitchen Lane and pond near England Springs: very 

 abundant. 



J.C., iii., April, 1882 



