igo PROCEEDINGS COTTESWOLD CLUB 191 1 



PALUDESTRINID^ 



Paludestrina Jenkinsii, Smith. Canal at Sharpness (a few 

 specimens). This form is somewhat local, but where it does 

 occur, it is usually found in myriads. Probably it is a recent 

 introduction to the neighbourhood. 



P. stagnalis (Brasier). [Rissoa uIvcb]. Brackish water 

 ditches at Shirehampton (Jones). This is a commoner form 

 than the last, but like it, usually occurs in shoals. 



P. stagnalis, var. barleei, Jeffreys. Shirehampton with 

 type (Jones). 



Bithynia tentaculata (L.) Common throughout the county 

 in canals and streams. 



B. Leachii (Sheppard). Canal, Stonehouse ; canal. Sharp- 

 ness. Common. 



B. leachii, var. albida, Rimmer. In canal near Chalford 

 to the entire exclusion of the type form. 



VIVIPARID^ 



Vivipara vivipara (L.) [Paludina vivipam]. Canal at 

 Cirencester and near Stroud (Jones). Very common in the 

 canal near Chalford. 



V. vivipara, var. efasciata, Pickering. One specimen in the 

 canal near Stroud Gas-Works. 



V. contecta (Millet). [Paludina Listen]. Newent canal 

 at Over; Combe-Hill canal (Jones). 



V. contecta var. inflata. Villa. Canal near Chalford. See 

 pi. XXV., figs. 3, 4. 



VALVATID^ 



Valvata piscinalis (Muller). Robins' Wood Hill reservoirs ; 

 River Poplar, etc. (Jones) ; Newent Canal, Barbers Bridge 

 (common) ; Cainscross Brewery pond ; canal at Stonehouse. 



V. cristata, Muller. Newent Canal at Over ; Ditches at 

 Maisemore Ham (Jones) ; canal. Sharpness ; canal, Stone- 

 house ; Vatch Mill pond, Stroud. 



POMATIID-ffi 



Pomatias elegans (Muller). [Cyclostoma elegans]. Com- 

 mon in hedgerows in the limestone districts, also on the hillsides 

 amongst herbage. 



P. elegans, var. pallida, Moquin-Tandon. Common with 

 the type. 



