T. D. A. COCKERELL : NORTH WILTSHIRE MOLLUSCA. 83 



Planorbis spirorbis. In the canal, with the two following. 



P. umbilicatus {=^complanatus Jeff.). 



P. carinatus. 



Limnsea peregra. In the canal and in a pond. 



L. auricularia. In the canal and elsewhere ; apparently as 

 common as Z. peregra in the district. One specimen 

 approached var. ampla. 



L. stagnalis. One in a pond, with L. auricularia. 



L. palustris. In a pond, with Z. /^r-j^ra. 



Ancylus lacustris. Type; in a pond. 



A. lacustris var. moquiniana. In another pond. The 

 measurements are : type, long. 5I mill., diam. 3 mill., alt. 

 \\ mill. ; variety, long. 6| mill., diam. 2\ mill, alt. 2 mill. 



Arion ater var. nigrescens. One under a stone. 



Limax agrestis. Type; common, but I did not see one of 

 the mottled variety. 



Succinea pfeifferi. By the canal. 



Hyalina cellaria. One specimen. 



H. pura. Type; one on an old tree-stump. 



H. crystal I ina. Locally abundant. 



Conulus fulvus. One by a pond. 



Helix aspersa. Very abundant. They are largely eaten 

 by the people round Swindon, under the name of ' wall- 

 snails.' I was assured by one who had eaten them that 

 they are very excellent.. 



H. hortensis. Common amongst nettles by the road-side; 

 the varieties found were luiea 12345, arenicola 1(23)45, 

 and the almost white bandless variety subalbida Locard. I 

 did not see any traces of H. nejnoralis. 



H. rufescens. Very common. 



H. rufescens var. rubens. One specimen. 



H. rufescens var. alba. One at Blunsdon, June 29th. 



H. concinna. One at the base of an elm tree. 



H. hispida. One by a pond. 



