THE NON-MARINE MOLLUSCS OF ESSEX. 69
Genus—PLANORBIS, Guettard, 1756.
Planorbis corneus, Linne.
A.—River Stort; (Ingold); Hatfield Forest ; (E.N., vol. iv.,
p. 223); Barking Side ; Wanstead ; East Ham ; Leyton ;
Whips Cross ; (Crouch) : Walthamstow ; (C.S.R.,
Kew): Leytonstone; (Newstead) : Ilford; (Woodward
after Morris) : Canning Town; (K. and W): Walthamstow;
(British Museum) : Grays ; ( Woodward after S. V. Wood) ;
West Thurrock ; ( Woodward).
B.—Coggeshall; (British Museum) : *Colchester ; (Laver) :
*East Mersea ; (Cole) : River Chelmer and Beeleigh
Mill) ; (E.N., vol. v., p. 253) ; Broomfield ; (E.N., vol.
vii., p. 76) : Chelmsford ; (Turner) ; Clacton ; (K. and W.
after S. V. Wood).
C.—Saffron Walden ; (S.W. Museum).
Planorbis albus, Muller.
A.—River Stort; (Ingold): Epping; (Newstead) : Chingford;
(C.S.R., Kew): Woodford; (E.N., vol. iii., p. 39) ;
St. Swithin's ; (Crouch): Ilford; (Wood-ward) : Canning
Town ; (K. and W.) : Walthamstow ; (British Museum) :
Grays; ( Woodward).
B.—River Chelmer, Felstead ; (French) : River Blackwater,
Coggeshall ; (British Museum) : *Donyland Heath ;
(Laver Coll.) : Colchester; Wyvenhoe Park—in brackish
water ; (Laver) : River Chelmer and Beeleigh Mill ;
(E.N., vol. v., p. 253) : Broomfield ; (E.N., vol. vii.,
p. 76) : Chelmsford; (Christy) : Ingrave; (W.M.W.) :
Braintree; Copford; (British Museum) : *Clacton; (Webb,
4); Chignal; (Christy 3).
C.—Harwich; (K. and W.),
Planorbis glaber, Jeffreys.
A.—Carswell Pond—one specimen ; (Crouch) : Dagenham ;
(British Museum) : Ilford; (K. and W.): Grays; (Wood-
ward after S. V. Wood).
B.—Clacton ; (K. and W.); Rains ; (British Museum).
Planorbis nautileus, Linne.
A.—Barking Side ; (Crouch) : Canning Town ; (K. and W.) ;
Walthamstow ; (British Museum) : Grays; (Woodward after
S. V. Wood).
B.—Coggeshall ; (British Museum) : Colchester ; *West
Bergholt; (Laver): Chignal; (C.S.R., Christy) : Chelms-