JACKSON: UIBLIOGl<j\l>HY OF NON-MARINli MOLLUSCA OF LANCASHIRE. 75 



1887. Roberts, George. — Notes on Varieties of Bythinia tenta- 

 ciilata. Naturalist, 1887, pp. 19-20. 

 jMonst. decollatum, from Prestvvich (coll. B. Tomlin), referred to. 

 1887. Tomlin, Brockton. — Monstrosities of various Lancashire 

 Shells. Naturalist, 1887, p. 20. 

 Ttrebrum of Planorbis complanatiis, Rochdale ; sinistrorsuni and 

 another monstrosity of Helix aspersa from Ulverston. 

 1887. Standen, R. — Lancashire Land and Freshwater Mollusca. 

 Naturalist, 1887, pp. 155-176. 

 A detailed enumeration of the forty-one fresh-water and thirty-nine 

 land shells and seven slugs recorded for Lancashire, based upon 

 Dyson's 1850 and Hardy's 1865 lists, and upon the observations of 

 the author and of W. H. Heathcote, F. C. Long, R. D. Darbishire, 

 T. Rogers, and others; at p. 176 are noted intentional introductions 

 of species into fresh localities. 



1887. Cockerell, S. C. — Mollusca of Coniston and Carnforth, 

 Lancashire. Naturalist, 1887, p. 190. 

 At Carnforth — Liinax agrestis ; Vitrina pellucida ; Zonites cellariiis, 

 Z. radiatuhis, Z. purus ; Helix aspersa, H. nemoralis, H. aculeata, 

 H. ericetorum, H. rufescens, H. pulchella, H. rotundata, H. rupestris ; 

 Bulimus obscurus ; Cochlicopa lubrica ; Pupa umbilicata ; Vertigo 

 edentula ; Clausilia rugosa ; and vars. dubia and tumidula ; noted : 

 At Coniston — Valvata piscinalis ; Physa fontinalis ; Liinncea peregra 

 var. lacustris ; Ancylus fliiviatilis ; Avion ater and var. albolateralis, 

 A. bourguignati ; Liinax agrestis, L. IcBvis, L. arbor mn ; Vitrina 

 pellucida ; Zonites alliarius, Z. nitidulus, Z. radiatulus, Z. fulvus, Z. 

 excavatus, Z. crystallinus; Helix aspersa, H. nemoralis, H hispida, 

 H. rotundata ; Pupa umbilicata ; Clausilia rugosa \ and Cochlicopa 

 lubrica noted. 



1887. Taylor, J. W. — Exhibits. J. Conch., v., p. 134. 

 Planorbis dilatatus from Gorton Canal (coll. T. Rogers). 

 1887. Taylor, J. W. — Exhibits. / Conch., v., p. 140. 



Planorbis spirorbis, distorted, found at Tarleton, S. Lancashire, by 

 Mr. W. H. Heathcote. 



1887. Heathcote, W. H. — Physa fontinalis var. albida at 

 Farington, S. Lancashire. J. Conch., v., p. 185. 

 Two found in 1887. 

 1887. Collier, E. — Exhibits. J. Conch., v., p. 202. 



Planorbis dilatatus from canal at Reddish, and P. spirorbis, 

 curiously distorted, from a ditch at Rusholme, Manchester. 

 1887. Bates, J. — Additional note on Planorbis dilatatus and PI. 

 glaber at Burnley. /. Conch., v., p. 221. 

 Discovered June, 1886, amongst Valvata piscinalis. 



