PROCEEDINGS : JUNE 8, I9I9. 65 



Francis J. Ede, A.M.I.C.E., M.I.C.E., F.G.S., Silclmr, Cachar, India (intio- 

 diiced liy Edward Collier and (}. C. Spence). 



Member Deceased. 



S. L. Petty. 



Paper Read. 



"A Scheme for the Division of the British Marine Area into Census Areas," 

 l)y U. Winckworlh. 



Principal Exhibits. 



By Mr. R. Harrison : Helix nenioralis vars. libellnla, olivacea^ etc. (all un- 

 handed), H. hortensis and H. arhnstoriun from Dove Dale ; H. nenioralis var. 

 libellitla (lianded), from Nahs Dale, Dove Dale, Derbyshire. 



By Mr. A. T. Ilopwood : Rare forms of Conus ; also fossil species ; Anodonta 

 cygiiTa and young Vivipata coiilecta from Sallies' Pond, Chorlton-cum-Hardy, 

 Manchester. 



By Mr. J. G. Kitchen : Planorbis conlortits from Poundswick, Cheshire. 



By Mr. G. C. Spence : Stenogyra soruerbyana and embryonic shells from the 

 shore of Lake Tanganyika ; Brachypodella leiuoplezira from Chichirivichi, Vene- 

 zuela (coll. F. G. Percival). 



By Mr. R. Standen : An unusually large specimen of yErope caffra, diam. 82 

 mm., alt. 46 mm. 



In the Special Exhibit of Oleacina, series were shown by Messrs. E. Collier, 

 R. Standen, and J. G. Kitchen, and by the Manchester Museum. 



It was decided. to have the following Special Exhibits : — 



September loth - - - Streptaxis. 



November 12th - - - Physa. 



December loth - - - British Cardiuin. 



Vertigo alpestris in Borrowdale, Cumberland. — The researches of Messrs. 

 Dean and Kendall { /oiini. of Coiick., xii., pp. 209 — 11 and 309) have shown 

 how widely spread Vertigo alpestris is in the English lake district, and the sole 

 purpose of this note is to record its occurrence in extraordinary numbers. At 

 Rosthwaite, last June, I spent a few minutes on four successive mornings in search- 

 ing the top of a slate wall covered with ivy in which were entangled dead leaves 

 of oak and apple from overhanging trees. In a length of less than six feet I col- 

 lected 402 living specimens of V, alpestris and 35 of V. piisilla, and on the occasion 

 of my last visit no material diminution in the number of the molluscs was apparent. 

 The association of V. pusilla and V. alpestris has already been commented upon 

 by Messrs. Dean and Kendall, but apparently the relative numbers are by no 

 means constant, for whereas of my Rosthwaite gathering 92 per cent, were alpestris 

 and 8 per cent, pusilla, a gathering of 74 shells in a similar habitat at Little 

 Crosthwaite, on the shore of Bassenthwaite Lake, comprised 44 '6 per cent, of 

 alpestris and 55 "4 per cent. o[ pusilla. — CuAS. Ol.DllAM {Read before the Society, 

 October 12th, 1918). 



