BEESTON: west LANCASHIRE NON-MARINE MOLLUSCA. 347 



every hedgerow and roadside bank, the varieties rubens and albo-cinda 

 being more abundant than the type. Helix nemoralis turned up in 

 two places only, the variety rubella predominating ; and of H. hortensis 

 only a single specimen was discovered. H. aspersa seemed fairly well 

 distributed, but not at all abundant anywhere, the variety albo-fasciata 

 occurring tolerably frequently \ this species, together with H. rufescens, 

 was certainly the commonest shell in the district. 



The genus Vitrea it will be seen from the appended list is fairly 

 represented, three species being found, viz., cellaria, alliaria, and 

 nitidula. Ot Pyramidula rotundata three specimens were all that 

 rewarded our search, and in one locality only. Helicella is represented 

 by one dead shell, viz., caperata; but Hygromia furnished three 

 species, one of which, Hy. granulala, constitutes an addition to the 

 Census List for Vice-County 60. 



Helicigofia arbustoriim appears to be rare, four shells only, two of 

 which are variety flavescens, rewarding a search of nearly half-a-day. 

 One dead specimen of Cochlicopa bibrica was all that could be found; 

 and of the genus Clausilia the only representative is bidentata. 



Succinea putris was found in only one locality — a damp ditch by 

 the roadside — crawling on the leaves of Veronica beccabunga (the 

 brooklime) the shells being dwarfed and few in number. Li/nncea 

 pereger and Z. palustris were obtained sparingly from the ditches in 

 the meadows lying to the east of the town of Morecambe, but as the 

 soil is of a peaty character, the shells were small in size and somewhat 

 thin in texture. In the Lancaster and Preston Canal Neritina fiuvia- 

 tilis — possibly the very commonest shell in the district — was found in 

 great abundance. The stones in the shallow water near the sides 

 were crowded in places with the molluscs which were even crawling 

 about on the mud at the bottom. Nearly all the shells of this species 

 were either badly eroded all over, or thickly incrusted with a deposit 

 of lime, and appeared quite white as the animals crawled about on the 

 stones. Scarcely a shell was perfect, and only the very youngest showed 

 the markings distinctly. In consequence, too, of this erosion (or 

 incrustation) the shells had a curiously distorted and mis-shapen 

 appearance, being very thick and heavy, thus favouring the idea of 

 being incrusted rather than of being eroded. 



Dreissensia polymorpha was not at all abundant, and instead of 

 being found in clusters and great abundance, as is generally the case, 

 the shells were attached singly to stones on the bed of the canal. 

 On the stonework of the bridges, where the shells are usually found 

 in great quantities, not one could be found. Anodonta cygnea, with 

 its variety anatitta, now finally reduced from specific rank to that of 

 a variety, was common in the canal, but not attaining a very large 



