COOPER AND LOYDELL : MOLLUSCA OF THE VALLEY OF THE COLNE. 327 



Succitiea pittris is exceptionally fine. Among the rarer species are 

 Arion interinedius, Pundum pygi/iceum, Vallotiia pulchella, Vertigo 

 atitivertigo, Segnientina nitida, Neritina fluviatilis, and genuine Pisi- 

 diiimpitsillum (as distinct from P. casertannm). In the Slough canal 

 are Bithynia leachii, Unio pidorum, U. tumidus, and SphcBrhwi rivi- 

 cola. The railway bank at West Drayton gives shelter to numerous 

 snails, including Helicella caperata. In and around West Drayton 

 we have found 57 species of mollusca. 



Colnbrook lies about two miles away. Near this village is the 

 Middlesex locality for Vertigo moiiiinsiana. Mollusca are abundant 

 in this neighbourhood, but the species are much the same as at West 

 Drayton and Yiewsley. 



Keeping near the county boundary, we soon reach Staines Moor. 

 A pond here yields very fine examples of Vivipara conteda ; and in 

 one of the branches of the Colne are Neritina fiuviatilis and Valvata 

 pisdnalis. 



Our total for the whole valley is 85 species. 



PROCEEDINGS OF THE 

 CONCHOLOGICAL SOCIETY OF GREAT BRITAIN & IRELAND. 



383rd Meeting, June 9th, 1909. 



Mr. R. Standen in the chair. 



Donations to the Library announced and thanks voted : 

 " A Preliminary List of Recent Middlesex Mollusca," by J. E. Cooper and A. 

 Loydell. " Manual of Conchology," part 78, by H. A. Pilsbry {.from the respeclive 

 authors). "Guide to the Coral Gallery," "Guide to the Shell and Starfish 

 Gallery," "Guide to the Fossil Invertel)rate Animals " {presenled by the Tntstees 

 of the British Miisewn) ; and the usual periodicals received in exchange. 

 Donations to the Cabinet announced and thanks voted : 

 By Mr. J. A. Hargreaves : Aciaila litieaia, Jaminia angltca, and Aiaiitliiiiula 

 Jamellata from Forge Valley, .Scarborough. 



By Mr. A. E. Boycott : Cyclostoma e/egans, males and females. 



New Members Elected. 

 J. H. Milton, Harrison House, Crosby. 

 Robert Cecil Dickson, Dalhousie Mlla, Carnoustie. 



Resignation. 

 F. H. Gravely. 



Papers Read. 



"A Preliminary Conchological Survey of Monniouthsliire, with Notes on 

 Brecknockshire," by F. II. Sikes, M.A. 



" On a Habitat oi Aciciila lineata" by J. A. Hargreaves. 



" Sexual Differences in the Shell of Cyclostoma elegans,^' by A. E. Boycott. 



