220 Linncean Society. 



much larger in this warm dike than elsewhere in this neighbourhood. 

 200 yards lower down the dike contains (where it runs through the 

 Rev. J. WoUey's fields), besides the above Planorbis tribe, Cyclas 

 lacustris, Limneus auricular ius , L. pereger, Pisidium pulchellum, and 

 Valvata cristata. A few hundred yards beyond this the water becomes 

 free of weeds and clear, and the whole tribe of Planorbis are left be- 

 hind. From Broadgate, all through the Highfield House estate, the 

 dike only contains Limneus pereger, and in one or two places Ancylus 

 fluviatilisy and on the moist mud on its banks Succinea Pfeifferi and 

 Limneus truncatulus. The Musco-Sic brook branches out from it at 

 Broadgate and joins it again at the east extremity of the Highfield 

 House estate ; this brook at first contains Planorbis marginatus, P. 

 vortex, P. carinatus, P. corneus, Bithinia tentaculala (very large), Val- 

 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 fluviatilis, 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 fluviatilis, 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 fluviatilis. 



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. 



