Mollusks. 339 1 



Valletia 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. 



Planorbis corneus. Very abundant in brooks at Lenton, Beeston, 

 Bulwell, Sawley, Attenborough, &c. 



P. carinatus. Very abundant in brooks at Lenton, Beeston, Bul- 

 well, and Attenborough, in the river Trent at Beeston, and under the 

 Seven Arches in Nottingham Meadows. 



P. marginatus. Abundant in dikes at Beeston, and of large size in 

 a stagnant ditch between Beeston and Attenborough. 



P. vortex. Very abundant in the river Trent, and in dikes at Bees- 

 toH, Lenton and Attenborough, and under the Seven Arches in Not- 

 tingham Meadows. 



P. spirorbis. Abundant in the river Trent at Beeston, and in dikes 

 at Beeston, Lenton, and Attenborough. 



P. albus. In few numbers in the river Trent near Beeston. 



P. contortus. Not common on the bogs at Bulw r ell, and rare in a 

 ditch at Lenton. 



P. imbricatus. Not common on dead leaves in the lake at High- 

 field House. 



P. nitidus. Rare in the lake at Highfield House, and in a pond at 

 Wollaton. 



(Bivalves). 



Cyclas rivicola. Rather abundant in the river Trent near Beeston, 

 and in the river Soar at Thrumpton. 



C. cornea. Very common in the river Trent near Beeston, and in 

 brooks at Lenton, Beeston, Attenborough, Bulwell, and Highfield 

 House, and under the Seven Arches in Nottingham Meadows. 



C. lacustris. Very abundant in a brook at Beeston, and another at 

 Highfield House. 



Pisidium amnicum. Abundant in the river Trent at Beeston, in a 

 ditch near Beeston railway-station, and in a brook at Beeston. 



