122 Linnean Society. [Feb. 18, 



vata piscinalis, Limneus pereger, Cyclas cornea, Pisidium pulchellum, 

 and Limneus auricularius. 



A very clear brook at Attenborough with Algae growing in it, 

 contains Planorbis corneus, P. carinatus, P. marginatus, P. vortex, P. 

 spirorbis, Ancylus fiuviatilis , Bithinia tentaculata, Limneus pereger, L. 

 auricularius, L. stagnalis, and Physa acuta. 



A similar brook at Lenton near the railway contains Planorbis 

 corneus, P. vortex, P. spirorbis, P. carinatus, Limneus stagnalis, L. 

 auricularius, L. pereger, Physa acuta, P. fontinalis, Valvata piscinalis, 

 Cyclas cornea, and Bithinia tentaculata, 



A small ditch some fifty yards from the last-named locality con^ 

 tains : — Bithinia ventricosa, B. tentaculata, Limneus truncatulus, L. 

 pereger, Valletia lacustris, Planorbis vortex, P. spirorbis, P. carinatus, 

 and P. contortus. 



The lake at Highfield House contains : — Anodon cygneus, A. cel- 

 lensis, A. anatinus, A. var. of anatinus, Unio pictorum, U. tumidus, 

 Dreissena polymorpha (very large), Planorbis nitidus, P. imbricatus, 

 and Limneus pereger. 



The river Soar at Thrumpton contains : — Cyclas rivicola, C. cornea, 

 Unio pictorum, Dreissena polymorpha, Anodon cygneus, A. anatinus, 

 Limneus pereger, L. stagnalis, and Paludina achatina. 



The river Trent near Beeston contains : — Pisidium pulchellum, 

 Anodon anatinus, A. avonensis, A. cygneus, Cyclas cornea, C. rivicola, 

 Bithinia tentaculata, Limneus pereger, L. stagnalis, Physa acuta, 

 Neritina fiuviatilis, Planorbis carinatus, P. vortex, P. spirorbis, P. 

 albus, Unio pictorum, U. tumidus, U. ovalis, Limneus palustris, Valvata 

 piscinalis, and Dreissena polymorpha. 



Under the Seven Arches in Nottingham Meadows are, Planorbis 

 carinatus, P. spirorbis, P. vortex, Bithinia ventricosa, B. tentaculata, 

 Valletia lacustris, Cyclas cornea, and Limneus pereger. 



In the river Lean at Bui well there are Valvata piscinalis, V. cris- 

 tata, Planorbis carinatus, P. contortus, P. vortex, Bithinia tentaculata, 

 Limneus pereger, Anodon cellensis, and Ancylus fiuviatilis. 



A moist mud-bank left by the Trent floods at Sawley contains 

 Limneus truncatulus, L. palustris, L. pereger, and Helix alliaria. 



A dry bank near has Helix nemoralis, H. arbustorum, H. hispida, 

 and Bulimus lubricus. 



A cool bank at Thrumpton contains Helix nemoralis, H. arbustorum, 

 H. hispida, H. fulva, Clausilia nigricans, Bulimus lubricus, Succinea 

 Pfeifferi, S. putris. Helix cellaria, and H. alliaria. 



A sand-bank in the lane at Highfield House has Helix nemoralis, 

 H. hispida, H. concinna, H. virgata, H. arbustorum, H. rotundata, 



