66 THE NON-MARINE MOLLUSCS OF ESSEX.
Family—Limnaeidae.
Genus—ANCYLUS, Geoffroy, 1767.
Ancylus fluviatilis, Muller.
A.—River Stort ; (Ingold) : River Roding ; Wanstead Park ;
(Crouch): Ilford; (Woodward after Boyd Dawkins): Can-
ning Town ; (K. and W.) : Walthamstow ; Docks ; Grays ;
(British Museum),
B.—River Chelmer, near Felstead ; (French) : *Kingsford ;
Stanway ; (Laver) : Frating ; (British Museum) : River
at Faulkbourne ; (Turner) : River Cann, Chignal ;
(Christy): Chelmsford; (W.M.W.) : Copford: (British
Museum); *Clacton; (Webb, 4).
C.—Saffron Walden ; (C.S.R, Ashford) : Audley End ;
(Saffron Walden Museum) : *River Stour ; (King).
Ancylus lacustris, Linne.
A.—River Stort ; (Ingold) : Hatfield Forest ; (E.N., vol. iv.,
p. 223) : Wanstead Park ; (Crouch) : Canning Town ;
Lea Valley; (K. and W.) : Grays; (British Museum).
B.—River Colne ; (Laver) : Little Tey ; (Adams) : River
Chelmer ; (E.N., vol. ii., p. 353) : Great Baddow ;
(W.M.W.) : Chelmsford; (Christy): Copford; (Laver):
Clacton ; (K. and W. after S. V. Wood); Baine ; (British
Museum). 
C.—Saffron Walden ; (C.S.R., Ashford) : River Stour ;
(King) : Wrabness and Ramsey; (Sheppard Coll.).
Genus—LIMNAEA, Lamark, 1801.
Limnaea auricularia, Linne.
A.—River Stort ; (Ingold) : Hatfield Forest ; (E.N., vol. iv.,
p. 223) ; High Beach, Loughton; (E.N, vol. vi., p. 73) :
River Lea, Chingford ; (C.S.R., Scharff): Ilford; (Wood-
ward after Morris) ; Canning Town ; (K. and W.) : Wal-
thamstow ; Grays; (British Museum).
B.—Beaumont; (Sheppard and Collection): River Colne—
forms intermediate between this and L. pereger ; (Laver):
River Chelmer ; (Christy): Broomfield; (E.N., vol. vii.,
p. 76); Margaretting ; (W.M.W.) : [Chelmer Valley—rare
in alluvium ; (French)] : *Clacton ; (Webb, 4) : Raine ;
(British Museum).
C.—Saffron Walden; (S.W. Museum): *River Stour; (Laver).