ZOOLOGY 



MOLLUSCS 



Out of the 138 species occurring in the British Islands, 95 are 

 known in Northamptonshire. This is a fair county average ; but some 

 20 of these are either very local or else very rare. 



None of the more typical south-western or of the Germanic forms 

 is present. 



One species, Pomatias elegans, appears to be dying out ; on the 

 other hand Helicel/a cantiana is reported to be extending its range in the 

 county. 



The Roman Snail {Helix pomatid) was probably introduced some 

 years ago, and quite lately a colony of the pretty little continental species, 

 Helicella terrestris (Penn.), has been imported by a local enthusiast. 



A. GASTROPODA 



I. PULMONATA 

 a. Stylommatophora 



A 

 has 



Limax maximus, Linn. Fairly common, 

 single example of a white variety 

 been found in Rockingham Park 



— Jiavus, Linn. Northampton 



— arhorum, Bouch. -Chant. Rockingham 



Park ; Danes Camp 

 Agtiolimax agrestis (Linn.) 



— lievis (Mull.) 



Amalia sowerbii (F6r.). Rockingham Park 



— i^i/^tei (Drap.). Examples of the var. 



plumbea have been found in a garden in 

 Northampton ; probably imported 



Vitrina pellucida (MuU.) 



V'ttrea cryitaUina (MUll.) 



— alliaria (Miller) 



— glabra (Brit. Auct.) 



— cellaria (MuU.) 



— nitidula (Drap.) 



— pura (Aid.). Near Northampton ; Yard- 

 ley Chase 



— radiatula (Aid.) 



— nitida (Mull.). 



on the Nene ; 



— fiilva (Mull.) 



Island by Ringstead Mill, 

 Rockingham Park 



Arion ater (Linn.) 



— hortensh. Per. 



— circumscriptus, John. 



— intermedius, Norm. Common enough in 



woods 



— suhfuscus (Drap.). By no means a com- 



mon species 



Punctum pygmaum (Drap.). Castle Ashby ; 

 Yardley Chase ; Gayton 



Pyramidula rupeitr'n (Drap.). Gayton ; Mil- 

 ton ; Rockingham Park 



— rotundata (Mull.) 

 Helicella virgata (Da C.) 



— itala (Linn.) 



— caperata (Mont.) 



— cantiana (Mont.). Common in south of 



the county ; said to have spread rapidly 

 in recent years 

 Hygromia fuica (Mont.). One specimen near 

 Kettering 



— granulata {A\A.). Brackley; Newborough ; 



Eye 



— hispida (Linn.) 



— rufescens (Penn.) 



Acanthinula aculeata (MUll.). Castle Ashby ; 



Eye ; Northampton ; Oakley 

 Vallonia pulchella (Mull.) 



87 



