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 A HISTORY OF KENT The two species of more particular interest in the assemblage, which is characteristic for the south-east of England, are Helicella cartu- siatia and Helix pomatia. The former is now a coastal species, practically confined to Kent and Sussex, but it formerly ranged into east Kent, being found in rain-wash deposits at Otford, Exedown and Greenhithe ; it has also been obtained from a post-tertiary deposit at Felstead in Essex, and a single dead (and possibly fossil) example has been picked up at Long Stratton, Norfolk : it has even been reported from more remote locali- ties, though these are doubtful records. The ' Roman snail ' {Helix pomatia), long thought to have been introduced by the Romans, but now known to have been a denizen of this country before their arrival, is confined to the chalky ridge of the North Downs, along which it is met with at intervals to as far east as Charing, so that here as elsewhere in England it stops short of the sea. A noteworthy absentee is Dreissensia polyt7iorpha, so plentiful in the Thames further west, but nowhere recorded in Kent. An introduction worthy of remark and one which may perhaps ultimately become established, is the pretty little conical Helicella elegans, for a colony of this species brought over from southern Europe has been settled near Dover, where it appears to be flourishing and spreading. A. GASTROPODA I. PULMONATA a. Stylommatophora Testacella hal'iotidea, Drap. Sevenoaks ; Beck- enham — scutulum, Shy. Faversham ; Folkestone ; Mabledon Limax maximus, Linn. — Jiavus, Linn. — arborum, Bouch. -Chant. Local AgrioUmax agrestis (Linn.) — lavis (Mull) Amalia sowerbii (F^r.) — gagates (Drap.). Chatham ; Wichling Fitrina pellucida (Mull.) Vitrea crystallina (Mull.) — alUaria (Miller) — glabra (Brit. Auct.) — cellaria (Mull.) — nitidula (Drap.) — pura (Aid.) — radiatula (Aid.) — nltida (Mull.) — fulva (Mall.) Local Ar'ion ater (Linn.) — hortensis^ Ylr. — circumscriptus, John. — intermedius, Norm. Bromley — subfuscus (Drap.). Wichling Punctum pygniaum (Drap.) Pyramidula rupestris (Drap.). Sevenoaks ; Dover — rotundata (Mull.) Helicella v'lrgata (Da C.) — itala (Linn.) — caperata (Mont.) — cantiana (Mont.) — cartudana (Mull.) Hygromia fusca (Mont.). Maidstone — granulata (Aid.) — hhp'ida (Linn.) — rufescens (Penn.) Acanthinula aculeata (Mull.). Local Vallonia pulchella (Mull.) Helidgona lapicida (Linn.) — arbiistorum (Linn.) Helix aspersa (Mull.) — pomatia, Linn. Brastead ; Cudham ; Otford ; near Maidstorte ; Stalisfield ; Charing — nemoralis, Linn. — hortensis, Moll. Buliminus obscurus (Mull.) Cochlicopa lubrica (Mull). Axeca tridens (Pult.) Local Cacilianella acicula (MqII). Pupa secale^ Drap. Between Dover and Folkestone — cylindracea (Da C.) — muscorum (Linn.) Sphyradium edentulum (Drap.). Keston