By E. W. Swanton. 77 



than usual in a pond at Wedhampton, in Wiltshire, with the Helix 

 alba. Diameter one-eighth of an inch" {= Helix nantileus, Test. 

 Brit., p. 466). Devizes (Hegiubothom) ; ponds near Lavington 

 and Devizes, Salisbury (Vize). 



Planorbis carinatus (Miiller). — Frequent in the two Avons 

 and the Kennet Canal. " We first discovered it in the Eiver 

 Avon about Lackham, but all dead and 'bleached white, which 

 seems to be the character of this shell in natural state. We do 

 not, however, believe, they inhabit that river, but are brought into 

 it in the time of floods, though we could never find it elsewhere, 

 amongst the other species, which is common in the neighbourhood " 

 [=Helix carinata, Test. Brit., p. 453). Brickearth at Fisherton 

 (Blackmore) ; Devizes (Miss Cunnington) ; Kennet and Avon 

 Canal, on weeds at Trowbridge, Salisbury (Vize) ; Swindon (Cock- 

 erell) ; Elcot Mill, Marlborough (Bromehead) . 



Planorbis umbilicatus (Miiller) . — Apparently not so widely 

 distributed as the preceding species. In a ditch between Trow- 

 bride and Studley ; Salisbury, and canal at Devizes (Vize) ; Swindon 

 (Cockerell) ; Amesbury, and streams near Avon at Salisbury 

 (E. W. S.). 



Planorbis vortex (Linne). — A frequent species. Swindon 

 (Cockerell) ; very abundant near Corsham and Trowbridge, North 

 Bradley, and canal at Devizes (Vize) ; Devizes (Miss Cunnington) ; 

 on caddis cases in ditches adjoining Avon at Malmesbury(E. W. S.) . 

 Planorbis spirorbis (Linne). — Common. Brick earth at 

 Fisherton (Blackmore) ; stream in lower part of Butts Valley, 

 Marlborough (Bromehead) ; Devizes (Miss Cunnington and others), 

 Swindon (Cockerell) ; Kennet and Avon Canal, Stratford-sub- 

 Castle, Salisbury, Steeple Ashton (Vize) ; Amesbury (E. W. S.) . 



Planorbis contortus (Linne).— Locally abundant. "It is 

 rather a local species, but we have found it not uncommon in the 

 River Avon about Lackham, after floods, having been swept from 

 the ditches in the neighbouring meadows, where it is found alive 

 in abundance" (=Helix contorta, Test, Brit, p. 458). Swindon 

 (Cockerell) ; Devizes (Miss Cunnington) ; stream at Amesbury, 

 Avon at Salisbury, and Edington (E. W. S.). 



