THE NON-MARINE MOLLUSCS OF ESSEX. 75
Family—Valvatidae .
Genus—VALVATA, O. F. Muller, 1774.
Valvata piscinalis, Muller.
A.—Bishop's Stortford ; (Ingold) : River Lea, Chingford ;
(C.S.R., Scharff) : Fern Hall; St. Swithin's ; (Crouch):
Leytonstone; (Newstead) : Ilford; (Woodward): Canning
Town ; (K. and W.) : Walthamstow ; (British Museum) :
Docks ; (Woodward) : Grays—with variation called antiqua;
(British Museum).
B.—River Colne, Halstead ; (Adams) : River Chelmer, Fel-
stead ; (French) : Coggeshall ; (Turner) : *Colchester ;
(Laver): Witham; (Turner): Chignal; (C.S.R., Christy):
Rivers Chelmer and Cann, Chelmsford ; (Christy) : Cop-
ford ; Braintree ; *Clacton ; Kelvedon ; Witham ; (British
Museum) : *Chignal; (Christy, 3).
C.—Saffron Walden ; (S.W. Museum) : Audley End Park ;
(C.S.R., Christy) : Harwich; (K. and W.).
Valvata cristata, Muller.
A.—Hatfield Heath ; (Hughes): St. Swithin's ; Barkingside;
(Crouch) : Lea Marshes ; (C.S.R., Rowe) : Dagenham ;
(C.S.R., British Museum—mixed with Planorbis glaber) :
Walthamstow ; (British Museum) : Ilford ; Canning Town ;
(K. and W.) : Grays ; (British Museum).
B.—River Chelmer, Felstead; (French): *Coggeshall; (British
Museum): Colchester; (Laver): Chelmsford; (Christy) :
River Cann, Chelmsford ; River Chelmer, Broomfield ;
(W.M.W.) : Clacton ; Copford ; (K. and W.) : Raine ;
Braintree; (British Museum) : *Chignal; (Christy, 3).
C.—Saffron Walden ; (S.W. Museum) : Ramsey ; (Sheppard
Collection).
Family—Assimineidae.
Genus—ASSIMINEA, Leach, 1828.
Assiminea grayana, Leach.
A.—Grays ; (Christy) ; Between Coldharbour Point and Pur-
fleet ; Grays; (Jenkinsi) : Tilbury Marsh; (Jenkins
Coll.).
B.—†River Colne, Colchester ; (British Museum): *Tolles-
bury ; ( ? ).
§ Put down as a pulmonale, which is, of course, not the state of the case.—W.M.W.