118 Linnean Society. [Feb. 18, 



ton and another at Attenborough, in the river Trent and tributaries 

 to that river near Beeston and Sawley, and also under the Seven 

 Arches in Nottingham Meadows. 



B. ventricosa. Only found in a narrovir ditch near the railway at 

 Lenton, where it is tolerably abundant, and under the Seven Arches 

 in Nottingham Meadows - 



Valvata piscinalis. Abundant in brooks at Beeston, Lenton, and 

 Bulwell, and in the river Trent near Beeston, 



V. cristata. In rare numbers in a brook on Bulwell Bogs. 



Succinea putris. Rather abundant at Thrumpton. 



S. Pfeifferi. Common at Sawley and near Highfield House, and 

 found between Beeston and Attenborough. 



Limneus auricularius. Abundant in the Musco-Sic dike near 

 Highfield House ; found at Lenton, Beeston, Attenborough, and 

 Sawley. 



L. pereger. Very abundant at Lenton, Beeston, Attenborough, 

 Sawley, Bulwell, Thrumpton, Highfield House, and Nottingham 

 Meadows. 



L. stagnalis. Abundant in a dike at Lenton, a dike at Atten- 

 borough, a mill-dam at Bulwell, a backwater at Sawley (called the 

 ' Old Trent'), and in few numbers in the river Trent near Beeston, 

 and a stagnant ditch between Beeston and Attenborough. 



L. palustris. Abundant on moist mud at Sawley and near the 

 railway at Thrumpton, and very large in a stagnant ditch between 

 Beeston and Attenborough. 



L. truncatulus. Rare in a ditch at Lenton and under the Seven 

 Arches in the Nottingham Meadows. 



Ancylus fluviatilis . Tolerably abundant in clear dikes at High- 

 field House, Attenborough, Bulwell and Oxton, and at the mouth of 

 a well at Newstead Abbey. 



Valletta lacustris. Tolerably abundant in a small ditch at Lenton 

 near the railway, and under the Seven Arches in Nottingham 

 Meadows. 



Physa fontinalis . Abundant in dikes at Lenton and Attenborough, 

 the canal at Lenton and a pond at Wollaton, and in small numbers 

 in the Musco-Sic brook near Beeston. 



P. acuta (of Sowerby). Abundant in the river Trent at Beeston 

 and Attenborough, rare in a brook on Oxton Bogs, in the canal at 

 Lenton, and in a ditch between Beeston and Attenborough. 



Aplexus hypnorum. Abundant in a dike at Beeston and rare in a 

 ditch near the Beeston railway station. 



Segmentina lineata. Rare in a brook on Oxton Bogs. 



