76 The Mollusca of Wiltshire. 



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) ; Kennet and Avon 

 Canal (Montagu). 



Limnaea glabra (Mliller). — 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 

 (Haslemere Museum) labelled " Great Bed wyn," 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 

 (Yize). 



Planorbis corneus (Linne). — A rare and local species. Bare 

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

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



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

 head) . 



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

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

 plentiful in the Kiver 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 " (=Hclix 

 alba, Test. Brit., p. 459). Swindon, one specimen measuring diam. 

 7iy mm., alt. 2 mm. (Cockerell) ; canal at Trowbridge and Devizes, 

 on cases of caddis- worms, Salisbury (Vize) ; Great Bedwyn (Town- 

 send) ; Stourton (E. W. S.). 



Planorbis glaber (Jeffreys.) — This species, of which most 

 British records are from northern counties, was found by Mr. 

 F. Townsend at or near Great Bedwyn in 1851. Presumably he 

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



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



