106 DERBYSHIRE LAND AND FRESHWATER SHELLS. 



Planorbis spirorbis, Cromford Canal. 



vortex, common in ponds and canals, 

 cariiiatns, ,, ., 



corneus, ,, ,, 



contortus, Old Trent, Ponds at Repton. 

 complanatus. 



var. albida, Top Dam, Eepton. 



GENUS II., PHYSA. 



Physa hypnorum, River Dove ; ditches, Repton. 

 fontinalis, common. 



GENUS III., limn;ea. 

 Limnsea peregra, common. 



var. ovata, Matlock. 



var. acuminata, Matlock. 



var. picta, rare, pool at Winster. 

 auricularia, Cromford Canal and Repton. 



var. acuta. ,, 

 stagnalis, common, 

 palustris, Old Trent, near Repton. 



var. elongata, Old Trent, near Repton. 



var. tincta, ,, ,, 



var, albida, ,, ,, 



truncatula, common in ditches. 



var. major, Winster. 



GENUS IV., ANCYLUR. 



Ancylus fluviatilis, River Derwent, Repton Brook, 

 var. albida, Pond near Ambergate. 

 lacustris, River Trent, near Newton Solney. 

 var. albida, ,, ,, 



TEKKESTEIAL. 

 FAMILY I., LIMACIDiE. 



GENUS I. 



Arion ater, common, 

 flavus, ,, 

 hoi'tensis, ,, 



GENUS III., LIJIAX. 



Limax agrestis, common, 

 maximus, ,, 



FAMILY III., HELICID^. 



GENUS I., SUCCINEA. 



Succinea putris, common. 



elegans, edge of pools in Via Gellia. 



GENUS II., VITRINA. 



Vitrina pellucida, common. 



GENUS III., ZONITES. 



Zonites cellarius, common. 



var. albida, Miller's Dale, 

 alliarius, ,, and Repton. 



nitidulus, common, 

 radiatulus, Repton. 

 nitidiis, 



