VOL. XVII. (2) LAND AND FRESH-WATER MOLLUSCA 191 



AOIOULID-ffi 



Acicula lineata (Drap). Amongst decaying leaves in a 

 damp spot in Worgan's Wood, near the Slad, Stroud. 



A. lineata, var. alba, Jeffreys. With the type, and in 

 about equal numbers. 



Neritina fluviatilis (L.) The Severn at Wainlode (Jones) ; 

 canal. Sharpness. 



PELECYPODA 



DRIESSENSIID^ 



Driessensia polymorpha (Pallas). [Driessena polymorpha]. 

 Berkeley Canal throughout its length. 



UNIONID^ 



Unio pictorum (L.) Newent Canal, Over ; Berkeley Canal, 

 near Stonebench— Rare (Jones) ; Stroudwater Canal near 

 Stroud. 



U. tumidus, Retzius. Severn at Wainlode and all the 

 canals (Jones). Chalford, in the canal. 



U. margaritifer. L. Near Ross, in the Wye (Jones). 



Anodonta cygnsea (L.) Common in the Severn and in all 

 the canals. 



A. cygnaea (L.) var. anatina. Canal at Chalford. 



A. cygnaea, var. pallida, Jeffreys. Canal at Kempsford. 



CYRENID^ 



Sphaerium rivicola (Leach). [Cyclas rivicola]. Newent 

 and Berkeley Canals ; Combe-Hill Canal ; Severn at Wainlode 

 (Jones) ; Stroudwater Canal near Stroud ; Berkeley Canal, 

 Sharpness. 



S. corneum (L.) [Cyclas cornea]. Brooks, ditches, ponds 

 and canals everywhere. 



S. corneum, var. flavescens, Macgillivray. Canal near 

 Chalford. 

 02 



