184 JOURNAL OF CONCHOI.OGY, VOL. 12, NO. 7, JULY, I908. 



Diameter one-eighth of an inch" {=^ffeHx iiantileus, Test. Brit., p. 

 466). Devizes (Heginbothom)j 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 River 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" {=H'elix carinata, Test. 

 Brit., p. 453). Brickearth at Fisherton (Blackmore); Devizes (Miss 

 Cunnington); Kennet and Avon Canal, on weeds at Trowbridge, 

 Salisbury (Vize); Swindon (Cockerell); Elcot Mill, Marlborough 

 (Bromehead). 



Planorbis umbilicatus Miiller, — Apparently not so widely 

 distributed as the preceding species. In a ditch between Trowbridge 

 and Studleyj Salisbury and canal at Devizes (Vize); Swindon 

 (Cockerell); Amesbury, and streams near Avon at Salisbury (E.W.S.). 



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

 (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, Marl- 

 borough (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.). 



Planorbis fontanus (Lightfoot). — A frequent species. "We 

 have found it sparingly in the ditches about Wareham in Dorsetshire, 

 and near the village of Wedhampton in Wiltshire, but have observed 

 it in greater abundance in a fish-pond at Lackham, in the same 

 county, and in the river contiguous, adhering to aquatic plants, 

 frequently deep in the water" {=Helix fontana, Test. Brit., p. 463). 



Segmentina nitida (Miiller).— A rare species. There are 

 specimens in the Cunnington Devizes Collection, and in the Townsend 

 Collection from Great Bedwyn in the Haslemere Museum. The Rev, 



