INLAND MOLLUSCA OF SOMERSET. 133 



Helix aspersa, nemoralis, horteiisis, arbustorum, Cantiana 

 (hedgebaiiks only) hispida, and rufescens. Woods produce 

 Arion empiricorum (coloured varieties), Limax arborum, 

 Vitrina pellucida, Ilellx fusca, Zonites (all), Bullmus Lack- 

 hamensis, Clavisilia laminata. Among moss and decaying 

 leaves, especlally those of the beech, are to be found Arion 

 flavus (?), Hellx fulva and aculeata, Zouites (all), Azeca 

 tridens, Baltea fragilis, Carycliium miuimum, Acme fusca, 

 and several of the Pupaj. Dry liüls and the sand-hills ofthe 

 coast abound with Helix virgata, caperata, and ericetorum, 

 and Bulimus acutus ; the last confined to the sand hüls. 

 Among Limestone rocks, heaps of stones, and icalls there are 

 found Helix lapicida, pulchella, umbilicata, and rotundata, 

 Pupa secale, umbilicata, pygmaja, &c., Bullmus obscurus, 

 Clausilia nigricans, and Cyclostoma elegans. The roofs of 

 Short grass give us Pupa museorum, pygma^a, &c., Achatina 

 acicula, and Helix pygmaBa ; and lastly, in loet inarshy 

 spofs, may be found Arion empiricorum var. ater, Limax 

 brunneus, Zonites nitidus, Succinea putris and PfeifFeri. 



Of the freshwater mollusca running streams and larger 

 rhines contain Unio tumidus and pictorum, Anodonta 

 cygnea, Pisidium amnicura, pulchellum, Henslowianum, 

 and cinereum, Dreissena polymorpha, Ncritina fluviatilis, 

 Valvata piscinalis and cristata, Bithinia ventricosa, Lim- 

 neus auricularius, Ancylus fluviatilis and oblongus, and 

 Planorbis albus. The rhines produce in great abundance 

 Pisidium pusillum, Cyclas Cornea, Paludina vivipara (rare), 

 Bithinia tentaculata, Physa fontinalis, Planorbis corneus, 

 carlnatus, marginatus, vortex, spirorbis, and contortus, 

 Limnasus pereger, stagnalis, truncatulus, and palustris. 

 Punds shelter in their still waters many of the i'hine specles, 

 and in addition Cyclas calyculata, Pisidium obtusale and 

 nitidura, Physa hypnorum, Planorbis inibricatus, glaber, 



