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 {AA.). Brackley; Newborough ; Eye — hispida (Linn.) — rufescens (Penn.) Acanthinula aculeata (MUll.). Castle Ashby ; Eye ; Northampton ; Oakley Vallonia pulchella (Mull.) 87
