Journal Article THE ECOLOGY OF POTAMOPYRGUS JENKINSI (SMITH) IN NORTH WEST ENGLAND WITH A NOTE ON MARSTONIOPSIS SCHOLTZI (SCHMIDT) Get access G.B.J. DUSSART G.B.J. DUSSART North West Water Authority, Rivers DivisionChertsey Hill, London Road, Carlisle CA1 2QX Search for other works by this author on: Oxford Academic Google Scholar Journal of Molluscan Studies, Volume 43, Issue 3, December 1977, Pages 208–216, https://doi.org/10.1093/oxfordjournals.mollus.a065375 Published: 01 December 1977 Article history Received: 29 September 1976 Published: 01 December 1977