R. STANDEN : LAND AND FRESHWATER MOLLUSCA, 157 



Dyson also describes this species under the name of Cyclas 

 calyculata Jenyns, and says it is ' Found in almost every pit in 

 this neighbourhood.' He further adds, * Gray places this species 

 as a variety of C lacustris ; I have often found this shell with 

 Cyclas cornea^ in ponds where there has not been a single 

 specimen of C. lacustris^ when C. cornea has been in abundance, 

 and C. calyculata the same ; therefore, I should think it is more 

 likely to be a variety of C. cornea than C. lacustris, and am of 

 opinion that there is sufficient reason to consider it a distinct 

 species.' 



var. brochoniana Bourg. Very abundant, fine, and beautifully 

 clean in ponds at Penwortham, Farrington, and near Lumb 

 Colliery, Clifton. Type absent in each locality, but ^//. corneum 

 very abundant. 



1866. Pond at Cheetwood (T.R.). 

 Sphaerium ovale ter. Mr. F. C. Long has sent me fine 'dead 

 shells' of this species, taken by him from mud thrown out by 

 the dredger in the Leeds and Liverpool Canal, near Burnley. 

 Canal at Pendleton (T.R.). 



'Bolton Canal' (Hardy's List, 1865). 'Found by Mr. T. 

 KelsalL' 



Very fine in a lodge used for condensing steam near Gorton. 

 My first find, May i860, was considered a fine find, and new. 

 The shell was soon found along the canal to Stockport and 

 Hatherlow, and in other cotton canals (R.D.D.). 

 Pisidium amnicum Miill. Plentiful in canal at Tarleton. A few in 

 canal at CHfton, and in ponds at Grimsargh and Fulwood. I 

 have taken a few remarkably fine specimens from the Lancaster 

 Canal at Woodplumpton. 



' Canal at Reddish. Bolton Canal at Stalybridge, occasionally 

 in the old river-bed at the overflow weir near Stretford, probably 

 brought down by the rain in floods ' (Hardy's List, 1865). 



' Found in Dallam Brook, Little Sankey, near Warrington, 

 in the mud ; and in the river Lune at Lancaster, a little above 

 the aqueduct, in the sandy mud at the roots of grass ' (Dyson's 

 List, 1850). 



Pisidium fontinale Drap. Abundant and very fine in ponds at 

 Birch, and near Eccles. Fine, but not plentiful, in canals at 

 Tarleton and Newsham ; occurs sparingly in ponds about 

 Prestwich, Swinton, Goosnargh, and Crossens. Park Lane, near 

 Burnley (F.C.L.). 

 var. henslowana Shepp. 



Canal at Agecroft (T.R.). 



May 1887. 



