MOLLUSCS 



The number of species recorded for the county of Norfolk amounts 

 to 100, and this out of a total of 139, known to occur in the British 

 Islands, may be considered a very high county average. 



It is an essentially British assemblage, offering no example of forms 

 typical of the south-w^estern or northern districts. 



So far as the distribution of its snails is concerned the county is 

 roughly divisible into the low^-lying marshy tracts of the river valleys, 

 and the uplands. 



The ditches in the former yield an abundance of species, but the 

 broads are tenanted by only a few kinds. 



In the uplands the hedgerow forms predominate ; but isolated ponds, 

 even those which are nearly dry in summer, yield unexpectedly large 

 numbers of specimens. 



An introduced species, Stenogyra goodalli (Mill), whose home is in 

 the West Indies, has been found in hothouses at Carrow. 



A. GASTROPODA 



I. PULMONATA 



a. Stylommatophora 

 Testacella haliotidea, Drap. Aylsham ; Did- 

 dington Hall, Brandon ; Norwich (?) 



— scutulum, Sby. Norwich, Foulsham, Lynn 

 Limax maximuSy Linn. 



— flavus, Linn. 



— arborum, Bouch.-Chant. 

 AgrioUmax agrestis (Linn.) 



— Icevis (Miill.) 

 Amalia sowerbVt (F6r.) 



— gagates (Drap.) 

 Vitrina pellucida (Mull.) 

 Vitrea crystallina (Mull.) 



— alliaria (Miller). Recorded from several 



places ; but specimens thus labeled 

 have, so far as seen, proved to be the 

 next species 



— glabra (Brit. Auct.). Costessey 



— cellaria (Moll.) 



— nltidula (Drap.) 



— pura (Aid.). Caistor St. Edmunds, Dun- 



ston 



— radiatula (Aid.). Near Norwich 



— nitida (Mull.). Plentiful in the Broad 



district 



— fiiha (Mull.) 



Arian ater (Linn.) 



— hortensis, F6r. 



— circumscriptus, John. St. Germans 



— intennedius. Norm. One or two places 



south of Norwich 

 Punctum pygniceum (Drap.) 

 Pyramidula rotundata (Mull.) 

 Helicella virgata (Da C.) 



— itala (Linn.) 



— caperata (Mont.) 



— cantiana (Mont.). More plentiful south 



of Norwich than elsewhere in the 

 county 



— cartui'iana (Miill). One dead specimen 



near Long Stratton 

 Hygromia granulata (Aid.) 



— hisplda (Linn.) 



— rufescens (Penn.) 



— Acanthinula acukata (MUll.). Norwich, 



Stratton Strawless 

 Vallonia pukhella (Mttll.) 

 Helkigona lapicida (Linn.). Norwich, Fram- 



ingham Earl 



— arbustorum (Linn.) 

 Helix aspersa, Miill. 



— nemoralis, Linn. 



— hortensis, Mull. 

 Buliminus obscurus (Miill.) 



87 



