HADDEN : NON-MARINE MOI.LUSCA OF WORCESTERSHIRE. Ill 



tlie count}' bouiidary line. I have not seen it elsewhere, but it prob- 

 ably occurs in similar localities further up the river. 



Bithynia tentaculata Linne. — Widely distributed in weedy 

 ditches throughout the county. Castlemorton Common. Earls 

 Croome. Near Feckenham (Reece). Avon (Doeg). 



vaf. ventricosa Menke. — Near Feckenham (Reece). Earls 

 Croome. 



B. leachi Sheppard. — "]\ralvern" ("Victoria County History"). 

 R. Teme (Reece). R. Avon near Twyning. 



Vivipara vivipara Linne. — Local, but abundant where it occurs. 

 Avon near Bredon. ^Vorcester and Birmingham Canal and Severn 

 (Reece). Avon at Glover's Isle and Fladbury (Doeg). 



Valvata piscinalis Miiller. — x\pparently rare and local. Hartle- 

 bury Common. River Severn (Reece). ALilvern ("Victoria County 

 History"). 



V. cristata Miiller. — Local, but fairly plentiful where it occurs. 

 Earls Croome. Ivempsey Grove (Reece). Near Worcester ("Victoria 

 County History"). 



Pomatias elegans Mi.iller. — "Malvern and Bewdley" ("Victoria 

 County History"). Dovedale, Blockley (Doeg). The Malvern record 

 probably refers to West Malvern specimens. This is not within the 

 Worcestershire boundary, but in Herefordshire. 



Neritina fluviatilis Linne. — Very local. R. Severn (Reece). 

 Avon below Harvington Mill, the weir at Evesham, and other parts 

 (Doeg). Malvern and R.Severn ("Victoria County History"). 

 R. Teme. 



Dreissensia polymorpha Pallas. — Abundant where it occurs. 

 R. Severn and Worcester and Birmingham Canal (Reece). The Avon, 

 abundant below Chadbury Hill (Doeg). 



Unio pictorum Linne. — Very local but abundant in parts of the 

 Avon. Avon near Bredon. Avon and Teme (Reece). Plentiful in 

 the Avon (Doeg). R. Teme at Powick. 



U. tumidus Retzius. — Distribution similar to that of the preced- 

 ing species. Avon near Bredon. Common in the Avon (Doeg). 

 Great Witley (Reece). R. Teme at Powick. 



Anodonta Cygnsea Linne.— Widely distributed in the rivers and 

 large ponds of the county. R. Severn. R. Avon. Birtsmorton Moat. 

 Callow End. Avon in great abundance (Doeg). R. Teme. 



var. anatina Linne. — Much more local than A. cjgncsa, but 

 occurs in parts of the Avon, Severn, and Teme. 



var. arenaria Schroter. — Specimens of this variety are in the 

 local collection in the Museum at Worcester (labelled var, zelleiisis) 

 from Lawn Brook and Knigh thill Pool, Severn Stoke. 



