MILNE AND OLDHAM : MOLLUSCA OF BOWDON DISTRICT. 323 



L. truncatula. Occasionally found, not usually in great 

 plenty. Localities are at Partington, BoUington, Northen 

 Etchells, Ringway, Sale, Baguley, Ashton, and Mobberley. 



L. glabra. Very local. Only found in two localities at 

 Baguley, in ditches. 



Ancylus fluviatilis. "In a small rivulet of clear water that 

 crosses the road a little before arriving at Baguley Moor " 

 (Dyson). "River Mersey, near Didsbury" (Hardy). It is 

 to be found also in the Bollin at Ashley, in the brook 

 connecting Mere and Rostherne Meres, Baguley Brook, 

 and streams in BoUington Meadows, and Gatley Carrs. 



Velletia lacustris. In the Bollin valley, from a pond by 

 Cotterill Clough, and two others in Hale, and at Mere. 



Viviparus contectus. " Very abundant in ponds at Sale, 

 Cheshire " (Standen in Melvill). This record refers to 

 Hampson's Pit, where the species was introduced about a 

 quarter of a century ago, from the Twenty Pits, Moss Side, 

 Manchester, then being filled up. We have not been able 

 to see any specimens from this locality, but, if examples 

 from Birch may be taken as probably representing them in 

 size, the shells introduced to Hampson's Pit will have 

 averaged about 32 mm. in length ; specimens may now be 

 taken there of 45 mm. or upwards, showing an increase in 

 size very similar to that of LimncRa stagnalis. From Hamp- 

 son's Pit the species has been introduced to two pits in 

 Brooklands (in 1884 and 1888) and one at Baguley Hall 

 (in 1888), in all of which it was still existing last year. 



Bythinia tentaculata. Rather uncommon — in Hampson's 

 Pit, Rostherne Brook, and the stream in BoUington 

 meadows. 



Valvata piscinalis. River Birkin at Ashley, and its tribu- 

 tary, Rostherne Brook ; and Brooklands. From the Birkin 

 come a few rather scalariform specimens. 



