82 The Mollusca of Wiltshire. 



Sphaerium lacustre (Miiller.) — Widely distributed. Swindon 

 (Cockerell) ; Great Bedwyn (Townsend) ; Drew's Pond, Devizes 

 (Miss Cunnington and Vize) ; Salisbury, Edington, Avebury, and 

 Amesbury (E. W. S.) 



var. ryckholti (Normand.) — Swindon (Cockerell) ; " the type 

 of S. lacustre was very common at one place, but only one of var. 

 ryckholti was found (measuring 6x6 mm.)" 



Pisidium amnicum (Miiller). — A common species. "Dr. 

 Maton, who first defined it as a distinct member of our fauna, 

 obtained his specimens from the Avon, near Salisbury, and Montagu 

 from the North Avon " (Forbes & Hanley, Brit. Moll., vol. ii., p. 134) . 

 Canal at Trowbridge, Milford near Salisbury (Vize) ; canal at 

 Devizes (Miss Cunnington and Vize); Elcot Mill, Marlborough 

 (Bromehead) ; brickearth at Fisherton (Blackmore) ; Stourton, 

 Salisbury, Edington, and Amesbury (E. W. S.). 



Pisidium henslowianum (Sheppard). — A local species. 

 Milford near Salisbury, Drew's Pond, Devizes (Vize) ; Great 

 Bedwyn (Townsend) ; Edington (E. W. S.) 



Pisidium subtruncatum (Malm).— Very local. Swindon 

 (Cockerell) ; Great Bedwyn (Townsend) ; Stourton (E. W. S.). 



Pisidium pusilium (Gmelin). — Locally abundant. North 



Bradley, Harnham Meadows, Salisbury (Vize); Swindon (Cockerell); 



brickearth at Fisherton (Blackmore) ; Great Bedwyn (Townsend). 



var. cinerea (Alder). — Great Bedwyn (Townsend); North 



Bradley and one or two other localities near Trowbridge (Vize). 



Pisidium nitidum (Jenyns).— Very rare. Elcot Mill, near 

 Marlborough (Bromehead). 



Pisidium obtusale (Pfeiffer).— Very rare. Kecorded only 

 from the neighbourhood of Salisbury. Milford, Salisbury (Vize) ; 

 brickearth at Fisherton (Blackmore) . 



Pisidium gassiesianum (Dupuy). Very rare. There are 

 specimens from Great Bedwyn in the Townsend Collection at the 

 Haslemere Museum. 



Pisidium pulchellum (Jenyns) .—Locally abundant. Brick- 

 earth at Fisherton (Blackmore) ; Milford near Salisbury, and 



