Jackson; iubliography ok non-marine mollusca ok Lancashire. 71 



1867. Higgins [Rev.], H. H. — Notes on the Local, Natural, and 

 Geological History of Rainhill. Proc. Lit. and Phil. Soc, 

 Liverpool, xxi,, p. 72. 



Reference made to Zonites excavatus, Z. radiatulus, Planorbis 

 imbriaxtus; also to "wall snail" and "garden snail." 



1868. Roberts, George. — Shells seen or collected, early in June, 

 during a Four-days' Walk in Lancashire and Craven. Zoologist, 

 iii., (second series), pp. 1381-1383. 



Near Morecambe — Pisidiiun fontinale var. cinerea ; Planorbis 

 marginatus, P. spirorbis, P, coiitortus \ near Hornby — LTelix arbus- 

 toriiin (a conical variety); Poulton-le-Fylde — Cyclas cornea; Physa 

 fontinalis ; Planorbis nautileus. Many other shells noted as common 

 in the localities visited. 



1869. Jeffreys, J. Gwyn. — On some British Freshwater Shells. 

 Ann. and Mag. Nat. /List. (4), iv., pp. 341-342. 



Planorbis dilatatus of Gould discovered in the Bolton and Gorton 

 canals by Mr. Thomas Rogers. Description of shell and animal 

 given, also probable means of introduction. Sphceriuni ovale also 

 noted as occurring in canals at Manchester. 



1870. Jeffreys, J. Gwyn. — New British Shells. Sci. Goss., 1870, 

 p. 130. 



Planorbis dilatatus from Bolton Canal, collected by Thos. Rogers ; 

 references also made to SpJuvrium ovale in canals near Manchester. 

 1870. Rogers, Thos. — New Shells. Sci. Goss., 1870, p. 138. 



Planorbis dilatatus in canals near Manchester. 



1872. Anon — Report, Bury Natural History Society. Appendix, 

 p. 49. 



Nine spp. noted with localities. 



1873. Hardy, John. — On the Occurrence of Unio tuniidus in the 

 Manchester District. Proc. Lit. and Phil. Soc. Manch., xii., 

 p. 117. 



Considerable numbers observed at Barton. 



1874. Rogers, ThoS.--On the introduction of Planorbis dilatatus 

 (Gould). Proc. Lit. and Phil. Soc. Afanch., xiii., pp. 174-175. 



Found in June, 1869, in the Bolton canal at Pendleton, and after- 

 wards in the Gorton canal. Probable means of introduction given at 

 length. 



1875. Anon. — On the Litroduction of Planorbis dilatatus (Gould) 

 into the British Isles. Quart, yourn. Conch., l, p. 81. 



Extract from Proceedings Nat. Hist. Sect. Manch. Lit, and Phil. 

 Soc, 1874. 



1876. Collier, Ed. — A white variety of Linuma palustris taken at 

 Southport. Quart. Journ. Conch., \., p. 139. 



Mentions also Physa hypnoruni as common. 



