VOL. XVII. (2) LAND AND FRESH-WATER MOLLUSCA 189 



L. truncatula (Miiller). In most brooks and ditches. 

 Usually found out of the water on the partly dried mud. 



L. stagnalis (L.) Maisemore-Ham ditch ; Combe Hill 

 and Newent Canals ; Kempsford ; Siddington (Jones) ; canal, 

 Chalford. See PI. xxv., fig. 5. 



L. stagnalis, var. labiata, Jeffreys. Canal at Chalford. See 

 pi. XXV., fig. 6. 



Planorbis corneus (L.) Ditch at Maisemore Ham ; Combe- 

 Hill Canal (Jones). Abundant and large in canal above Chal- 

 ford. 



P. var. albina, Moquin-Tandon. Common in the Summer 

 of 1908 at Chalford with the type. Two specimens of this 

 variety were taken showing spiral colour bands. 



P. albus, Miiller. Newent Canal, Over near Gloucester 

 (Jones).; Cainscross Brewery pond (common) ; Chamber's 

 Pond, Stroud ; canal, Stonehouse ; canal, Sharpness. 



P. crista (L.) [P. nautileus]. Near Wit comb's Mill, Barn- 

 wood (Jones) ; Chambers' Pond, Stroud. 



P. carinatus, Miiller. Maisemore-Ham ditch ; Newent 

 Canal (Jones) ; canal, Chalford. 



P. umbilicatus, Miiller. [P. marginatus]. Maisemore Ham ; 

 Newent Canal (Jones). Pond, Hempstead; Thames and 

 Severn Canal throughout its length. 



P. vortex (L.) In ponds, ditches and canals everywhere. 



P. spirorbis (L.) Podgmead, Hempstead (Jones) ; Thames 

 Head, near Kemble. 



P. contortus (L.) Maisemore Ham ; Newent Canal, Over 

 (Jones). Ditch at Hempstead ; canal at Thrupp, near Stroud 

 and Stonehouse ; canal, Sharpness. 



P. fontanus (Lightfoot). [P. nitidus]. Pond at Barnwood 

 (Jones) ; Damsels Mill pond, Painswick ; canal, Sharpness ; 

 Chamber's Mill pond, Stroud. 



PHYSID^ 



Physa fontinalis (L.) In clear ponds, streams and canals. 

 Generally distributed. 



Aplecta hypnorum (L.) [Physa hypnorum]. Hempstead, 

 in pond in the field leading to Podgmead. Over, near Gloucester, 

 in a ditch near the Butts (Jones) ; Thames Head, near Kemble. 

 o 



