SWANTOX : THE MOLLUSCA OF WILTSHIRE. 185 



J. E. Vize found "one shell after many searches near the canal bridge 

 on the Trowbridge and Bradford road," and also recorded it from the 

 canal at Devizes. 



Physa fontinalis (Linne). — Abundant in the canal at Trowbridge, 

 splendidly fine on the Trowbridge and Bradford road, Drew's Pond, 

 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 ot 

 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. fo?ittnalis, and yet they had never communicated with each other, 

 for in neither place were they to be found together" {=Bulla hyp- 

 norum, Test. Brit, p. 229). Large size at Corsham, sparingly and 

 small on the Hilperton and Steeple Ashton road, 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 

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

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

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



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

 occurring only in two localities. Salisbury and Devizes (Vize). 

 Specimens from the latter place are in Miss Cunnington's collection. 



Vivipara vivipara (Linne). — Locally abundant, but certainly not 

 a common species. So very abundant at certain seasons that they 

 can be collected in great numbers from the Kennet and Avon Canal 

 at Trowbridge, canal at Heybrook, and Devizes (Vize) ; canal at 

 Cricklade, canal near Wroughton, Marlborough (Bromehead). 



Vaivata piscinalis (Miiller). — A common species. "We have 

 found it in various parts of Wiltshire, especially in the Avon, and in 

 the moat round the old castle at Marlborough" {=Turbo fontinalis. 

 Test. Brit., p. 349). Canal reservoirs at Devizes (Vize) ; brickearth 

 at Fisherton (Blackmore); stream at Amesbury, Calne, Salisbury 

 (E.W.S.). 



Vaivata cristata Miiller. — A very local species. " Not uncommon 

 in drifted sand in the River Avon with the last {Pla?iorbis albus), and 

 sometimes on aquatic plants, but more plentiful in a ditch near Wed- 

 hampton in Wiltshire; it may, however, be considered as rather a 

 scarce, or at least, a very local species " {=JIelix cristata, Test. Brit., 



