DEAN : LAND AND FRESHWATER SHELLS OF MORECAMBE AND DISTRICT. 45 



P. umbilicatus Miiller. — Frequent in the canal at Aldcliffe, Lan- 

 caster, in very fine condition. In several ditches to the west of 

 Lancaster, this shell is very common. Also at the Leighton Beck, 

 Hale; ditches, near Heysham (H.B.); and in 1904 I noticed some 

 specimens among some refuse on the banks of the river Beeta at 

 Milnthorpe. 



P. vortex L. — Very common in the canal at Lancaster, and in 

 fine condition ; ditches near Heysham (H. Beeston). Mature speci- 

 mens taken in April and May. 



P. spirorbis L. — Common in ditches at Torrisholme ; Burrow 

 Heights, Scotforth ; Heysham (H. Beeston); Claughton near Hornby; 

 very fine at the ditch above Halton on the Slyne Road ; ditches at 

 Storrs Moss (J.W.J.) ; and large tank at Woodwell, Silverdale ; April. 



P. contortus L.— The only localities recorded are Haweswater, 

 Silverdale; brook at Cark (J. & M.). 



P. fontanus Lightfoot, — Sparingly in the canal ; ditch at Lady's 

 Walk ; Bankwell, Silverdale. 



Physa fontinalis L. — Occurs in the river Lune at Caton ; at 

 Lady's Walk ditch, Lancaster ; also extremely plentiful in the canal 

 in the early months of the year. The finest specimens have been 

 taken in April and May (lo-ii mm. alt.). Also at Haweswater, 

 Silverdale. 



Aplecta hypnorum L. — Very local. In ditches at White Lund, 

 near Morecambe ; Burrow Heights, Scotforth, Lancaster ; Halton, on 

 the Slyne Road ; Haweswater ; Leighton Beck, Hale. Mature 

 specimens taken at Halton in April. 



Bithynia tentaculata L.— Finest in the canal at Aldcliffe, 

 Lancaster; also at Lady's Walk; Haweswater. Mature specimens 

 taken in large numbers in April. 



Fossil at Haweswater (David Dyson), 1850 ; and at the Burton 

 and Yealand Moss (David Dyson). 



Valvata piscinalis Miiller. — Finest at Lady's Walk ditch and 



Haweswater connecting drain ; also in the canal and the river Lune ; 



brook at Cark (J. & M.) ; river Winster near Grange (C. H. Moore). 



Specimens from Lady's Walk taken in March measure seven mm. alt. 



var. albina Taylor. — Cark (C. H. Moore), 1903. 



Fossil at Haweswater and Hale Moss. 



V. cristata Miiller. — Fairly common in the canal ; and at Bank- 

 well, Silverdale ; April. 



Fossil at Haweswater and Hale Moss. 

 Pomatias elegans Miiller. — There have been several records 

 for this species in the limestone area. The var. ochraleuca is the most 

 frequentform. Silverdale: — Recorded first by Dr. R. F.Scharff in 1881; 



