XXXIV MOLLUSCA OF SOMERSET. 
Euconulus fulvus, Miiller. 
Agriolimax agrestis, Linné. 
Sphyradium edentulum, Draparnaud (= Vertigo edentula). 
Pyramidula rotundata, Miiller. 
Clausilia bidentata, Strém. 
Carychium minimum, Miiller. 
The characteristic species in the apple orchards is Balea 
perversa, Linné, which occurs on the moss-clad trunks of old 
trees, often in company with Clausilia bidentata, Striém. 
The open hedgerows contain the following association : 
Hygromia rufescens, Pennant (dominant). 
Agriolimax agrestis, Linné. 
Arion ater, Linné. 
Arion hortensis, [érussac. 
Helicigona arbustorum (uncommon). 
Helix aspersa, Miiller. 
Helix hortensis, Miiller. 
All the members of this association shew a marked pre- 
dilection for dead hawthorn leaves, and dead vegetation of any 
kind. H. arbustorum is of restricted range, occurring only in 
damp spots, and often in association with ivy (Hedera helia, 
Linné). 
In damp meadows on heavy clay we find the following 
association : 
Agriolimax agrestis, Linné (dominant). 
Arion ater, Linné. 
Arion hortensis, Férussac. 
Arion fasciatus, Nilsson. 
Vallonia excentrica, Sterki (rarely). 
Vertigo pygmea, Draparnaud (rarely). 
Agr. agrestis often occurs in extraordinary abundance, and 
with the three Arion may be noted during hay harvest beneath 
grass which has been cut for three or four days. 
