198 NOTTINGHAMSHIRE LAND AND FRESHWATER SHELLS. 
GENUS I1., BYTHINIA. 
Bythinia tentaculata, very common. 
var. decollata, Lenton and Attenborough. 
Leachii, rare, ditch, Nottingham Meadows. 
FAMILY III., VALVATIDA. 
GENUS VALVATA. 
Valvata piscinalis, common. 
var. depressa, common. 
cristata, ditches at Bulwell, Attenborough, and Nottingham, very 
plentiful. 
ORDER II., PULMONOBRANCHIATA. 
FAMILY LIMNAIDZA. 
GENUS I., PLANORBIS. 
Planorbis lineatus, brook at Oxton Bogs, and Highfield House Lake. 
nitidus, rare, in Canal at Lenton and Nottingham, and Highfield 
House Lake. 
nautileus, plentiful in ditch at Bulwell, and lake at Highfield 
House. 
albus, rare, Bulwell and Lenton, and Canal at Nottingham. 
glaber, Beeston and Mapperley, in ponds. 
spirorbis, common. 
vortex, “9 
var. compressa, Stanton-on-the- Wolds. 
carinatus, common 
complanatus, ,, 
corneus, » 
contortus, very plentiful at Bulwell, Colwick, and Canal at 
Nottingham. 
GENUS II., PHYSA. 
Physa hypnorum, plentiful at Beeston in ditches and ponds. 
fontinalis, common. 
var. curta, Beeston Meadows. 
var. inflata, Lenton. 
GENUS III., LIMNAA. 
Limnea glutinosa, rare, Beeston Lock, in backwater of Trent. 
peregra, very common. 
var. ovata, very common. 
var. oblonga, common. 
var. acuminata, ,, 
var. decollata, not uncommon. 
auricularia, Canal at Nottingham and Wollaton. 
var. acuta, lake at Highfield House. 
stagnalis, commcn. 
var. fragilis, common. 
palustris, very common. 
var. tincta, Beeston and Lenton. 
var. corvus, Sawley. 
var. decollata, not uncommon. 
truncatula, plentiful in Trent at Beeston, ditch near Mansfield, 
also at Edwinstone and Lenton. 
var. elegans, Beeston. 
GENUS Iv., ANCYLUS. 
Ancylus fluviatilis, common on submerged stones. 
var. albida, plentiful in a stream at Bulwell. 
var. capuloides, Tottle Brook. 
lacustris, Beeston and Radford. 
