SWANTON : THE MOLLUSCA OF WILTSHIRE. « 183 



the end of Lord Methuen's Park, Salisbury, Devizes, Hungerford 

 (Vize); Marlborough (Bromehead); Amesburyand Avebury (E.W.S.). 

 var. elegans Jeffreys. — Devizes (Miss Cunnington). 



Limnaea Stagnalis (Linne). — Locally abundant. Montagu's 

 Helix fragilis is probably the var. fragilis; he remarks "The only 

 place in which this has ever occurred to us is the canal intended to 

 make a junction of the Kennet and Avon, between Chippenham and 

 Laycock. Many that were collected from that water were all of the 

 same slender shape, and in the younger shells there were, in all we 

 examined, a few opaque white lines, crossing the smaller volutions. 

 The largest measured an inch and a half in length and not quite 

 three-quarters of an inch wide in the largest part" (Test. Brit., p. 369). 

 Devizes (Miss Cunnington and others); Trowbridge (Vize); Swindon 

 (Cockerell) ; Marlborough, in pond one mile north of Chase Woods, 

 Elcot Mill, Flashy Pond (Bromehead); Avon at Salisbury (E.W.S.). 

 var. fragilis Linne. — Pond three hundred yards west of north- 

 end Tunnel, Elcot Mill (Bromehead); Avon and Kennet Canal 

 (Montagu). 



Limnsea glabra (Miiller). — The inclusion of this — the rarest 

 British representative of the genus — in the Wiltshire list rests upon 

 half-a-dozen specimens in the Townsend Collection labelled "Great 

 Bedwyn," probably collected in the year 1850, and upon Jeffreys' 

 record (B.C., i., 118). It is the Helix octanfracta of Montagu. 



Amphipeplea glutinosa (Miiller). — Very rare. Salisbury (Vize). 



Planorbis COrneus (Linne). — A rare and local species. Rare 

 at Salisbury, where Dr. Blackmore thinks it was probably imported 

 (Vize); canal near Wroughton, Marlborough (Bromehead). 



var. albida Moquin-Tandon. — Canal at Cricklade (Bromehead). 



Planorbis albus Miiller. — A common species. "It is one of 

 the most common of the compressed species of Helix; it is plentiful 

 in the River Avon about Lackham, as well as in the fishponds; and 

 in many other places in the same county, especially at Wedhampton, 

 in ditches and ponds, of a superior size" {=Helix alba, Test. Brit., 

 p. 459). Swindon, one specimen measuring diam. 7^^ mm., alt. 2 mm. 

 (Cockerell); canal at Trowbridge and Devizes, on cases of caddis- 

 worms, Salisbury (Vize); Great Bedwyn (Townsend); Stourton 

 (E.W.S.). 



Planorbis glaber Jeffreys. — This species, of which most British 

 records are from northern counties, was obtained by Mr. F. Townsend 

 at or near Great Bedwyn in 1851. Presumably he obtained it, as 

 well as L. glabra, from the Avon and Kennet Canal. 



Planorbis crista (Linne). — A rare species. "Of a larger size than 

 usual in a pond at Wedhampton in Wiltshire, with the Helix alba. 



