78 The Mollusca of Wiltshire. 



Planorbis fontanus (Lightfoot).— A frequent species. "We 

 have found it sparingly in the ditches about Wareham, in Dorset- 

 shire, and near the village of Wedhampton, in Wiltshire, but have 

 observed it in greater abundance in a fish-pond at Lackham, in the 

 same county, and in the river contiguous, adhering to aquatic 

 plants, frequently deep in the water " (= Helix fontana, Test. Brit. 

 p. 463). 



Segmentina nitida (Miiller).— A rare species. There are 

 specimens in the Cunnington Devizes Collection, and in the 

 Townsend Collection from Great Bedwyn in the Haslemere 

 Museum. The Eev. J. E. Vize found "one shell after many 

 searches near the canal bridge on the Trowbridge and Bradford 

 Boad," and also recorded it from the canal at Devizes. 



Physa fontinalis (Linne), — Abundant in the canal at Trow- 

 bridge, splendidly fine on the Trowbridge and Bradford Boad, 

 Drew's Bond, Devizes, and Salisbury (Vize) ; there are Devizes 

 specimens in Miss Cunnington's Collection ; Elcot Mill,Marlborough 

 (Bromehead) ; Edington and Amesbury (E. W. S.). 



Aplecta hypnorum (Linne). — A local species. "In Wiltshire 

 of an extraordinary size, measuring nearly three-quarters of an 

 inch. In a pond, subject to be overflowed by the Avon in that 

 county, we have seen great abundance, and in the same field were 

 plenty of the B. fontinalis, and yet they had never communicated 

 with each other, for in neither place were they to be found to- 

 gether" (Bulla hypnorum, Test. Brit., p. 229). Large size at 

 Corsham, sparingly and small on the Hilperton and Steeple Ashton 

 Boad ; Trowbridge, very abundant, and Salisbury (Vize) ; Edington 

 and Avebury (E. W. S.). 



Bithynia tentaculata (Linne). — A common species. Swindon 

 (Cockerell) ; abundant in the Kennet and Avon Canal in winter and 

 summer, Salisbury and Devizes (Vize); Idmiston, one with a spiral j 

 band of distorted epidermis (W. L. W. Eyre) ; Kennet and Avon 

 Canal near Elcot Mill (Bromehead) ; Devizes (Miss Cunnington) ; 

 brickearth at Fisherton (Biackmore) ; Amesbury (E. W. S.). 



Bithynia leachi (Sheppard). — Apparently a very rare species, | 



