MOLLUSCS 



A coastal county with numerous estuaries, marshes, streams, and 

 many woodlands and heaths, Essex is an ideal spot from the molluscan 

 point of view. 



Accordingly we find that out of a possible 139 species for the whole 

 of the British Islands 1 10 are now living in the area while 10 more have 

 been met with in the numerous Post-pliocene deposits, viz. Vitrea 

 excavata, Helicella cartusiana^ Acanthinula lamellata, Pupa ang/ica, Vertigo 

 minufissima, V. a/pesfris, V. angustior, Clausilia rolphii, Succinea oblonga and 

 Acicula line at a. 



Some of these, and one or two more slugs, may yet be discovered in 

 the county. In addition the Post-pliocene deposits have yielded the 

 following which no longer live in this country, viz. Pyramidula ruderata^ 

 Eulota fruticum, Paludestrina marginata, Unto littoralis and Corbicula 

 fluminalisy with two entirely extinct forms Vivipara clacktonensis and 

 Pisidium astartoides. 



The notable absentees from the list are consequently the species 

 peculiar to the south-western portions of England. 



The principal sources of information are papers by Mr. W. M. Webb, 

 A. S. Kennard and B. B. Woodward in the Essex Naturalist, vol. x. 1897. 



A. GASTROPODA 



I. PULMONATA Anon ater (Linn.) 



a. STYLOMMATOPHORA ' horten " s > .f* r> . . 



circumscrtptuS) John. 



Teitactlla kaliotidea, Drap. Sisted, Widford subfuscus (Drap.). Warley 



scutulum, Sby. Buckhurst Hill ; Wanstead Punctum pygmaum (Drap.) 



Limax maximus, Linn. Pryamidula rupeitris (Drap.). Barking Side 



flavin^ Linn. - rotundata (Mall.) 



arborum, Bouch.-Chant. Saling ; Chignal ; Helicella virgata (Da C.) 



Weald Hall Park, Brentwood ; Ingrave itala (Linn.) 

 Agriolimax agrestis (Linn.) captrata (Mont.) 



LeviSj Mflll. Wanstead ; Warley ; Hal- cantiana (Mont.) 



stead ; Chelmsford Hygromia fusca (Mont.). Saffron Walden 

 Amalia sowerbii (Fer.). Barking Side ; Chelms- granulate (Aid.) 



ford ; Brentwood hispida (Linn.) 



Vitrina pellucida (Mall.) rufesctns (Penn.) 



Vitrea crystallina (Mall.) Acanthinula aculeata (Mflll.) 



alliaria (Miller) Vallonia pulthella (Mall.) 



glabra (Brit. Auct.) Helicigona lapicida (Linn.) 



cellaria (Mall.) arbuitorwn (Linn.) 



nitidula (Drap.) Helix aspersa, Mall. 



pura (Aid.) pomatia. Linn. Great Bardfield ; Chappel ; 



radiatula (Aid.) Chalkney Wood ; Witham ; Chignal 



nitida (Mall.) Smealey 



fuhia (Mall.) nemoralit, Linn. 



I 89 12 



