286 .MILNES; L,\ND AND FRESHWATER SHELLS OF DERBYSHIRE. 



A. lacustris var. albida (Jeff.). River Trent, Newton Solney 



. ; _(J. Hagger). -. ■ . . . ., . ; ..:•- 



Neritina fluviatilis (L.). Canal at WiUington (J. Hagger) ; 



Matlock (H. Milnes and J. A. Howe) ; Borrowash (T. Kef, 



J. of Conch., vol. vi., p. 117). 

 Viviparus contectus (Millet). One very young specimen 



adhering to floating leaves of amphibious Persicaria in 



Cromford Canal, near High Peak Junction (H. E. Craven); 



two shells in Derby and Burton canal, near WiUington 



(T. Hey, J. of Conch., vol.vi., p. 117). . - 



V. viviparus (L.). Scarce and small in Cromford Canal (Ft. 

 - Milnes, H. E. Craven, and J. A. Howe) ; abundant and fine 



in canal at WiUington (T. Hey, J. of Conch., vol. vi., 



p. 118). 

 Bythinia tentaculata (L.). Cromford Canal (H. Milnes and 



H. E. Craven); common. J. of Conch., vol. vi., p. 118.^ 

 .B, leachii (Shepp.). Eggington (J. Hagger) ; ShardJow (T. 



Hey, J. of Conch. ,\o\. vi., p. 118). Moderately common. 

 Valvata piscinalis (MiilL). Cromford Canal (H. Milnes, 



H; E. Craven, and J. A. Howe); Derby (T. Hey, /. of 



Conch., \o\. v'\.,\>. 118). Abundant. 

 .\l) piscinalis .monst. sinistrorsum . Jeff. Cresswell (E. 



Pickard,y; of Conch., vol. iv., p. 145). 

 ./'V.i. •cristata Miill. Eggington (P.B.Mason). 

 Unio turn id us Phil. Cromford Canal (H. Milnes); WiUing- 

 ton canal (J. Hagger and T. Hey, /. of Conch., voL.vl, 

 . - -p. 117). Plentiful. . . : . . 



U. tumidus var. ovalis (Mont). Park Pond, Repton (J. 



- Hagger). • 



. U. tumidus var. radiata Colb. Park Pond, Repton (J. 

 ■/ Hagger). ,,"..; .\ 



U. pictorum (L.). Cromford Canal (H. Milnes); Park 

 ,'•-'■- .:Pond, Repton (J. Hagger); Derby and Burton Canal 



(T. Hey, /. of Cotich., vol. vi., p. 117). Plentiful ' 



J.C, vii., Oct. 1893. 



