PROCEEDINGS OF THE CONCHOLOGICAL SOCIETY. 243 



Mr. William Nelson also exhibited Liiiniaa stagnalis var. expansilahris 

 from Osmondthorpe, near Leeds. 



Mr. R. D. Gardner showed various shells from Ackworth, South-West 

 Yorkshire. 



Mr. W. Denison Roebuck, F. L.S., showed Helix pisana from a new 

 county, Louth, where it was found recently by Miss Sidney Smith ; Liiiiax 

 flavus from Black Rock Lighthouse, co. Mayo, sent by Mr. R. Widdicombe ; 

 and numerous Scottish shells sent by Mr. W. Evans, F. R.S.E. , including 

 PisidhiiH yosemn, P. nitidnni, Liinmea palustris, .&c. , all taken f»om the 

 stomachs of Shoveller Ducks {Spatula clypeata) shot at Loch Leven. 



178th Meeting, 7th May, 1890. 



Mr. J. W. Taylor, F. L.S., Vice-President, in the chair. 



Donations to Library announced and thanks voted : Naturalist, 

 Feuille des Jeunes Naturalistes, Proceedings ol Linnean Society of New 

 .South Wales and of Nova Scotian Institute, all in exchange, and from their 

 respective authors, R. Bergh on Die Cladohepatischen Nudibranchien, and 

 W. E. Collinge on the Land and Freshwater Mollusca of Ingleton. 



Exhibits, 



Mr. C. W. Young showed a fine series of marine and freshwater shells 

 of North America and the Eastern Seas, collected by the late Dr. P. P. 

 Carpenter ; these included Unio complauatus from the river Potomac, U. 

 spatulatiis from Fox River, Illinois, U. gil'l'osus from Green River, Kentucky, 

 Cyclas striatina from the Erie Canal, and an interesting specimen of 5 'ohlia 

 portlandica (semi-fossil) from Portland, Maine. 



Mr. John Nicholson exhibited a number of shells collected by himself in 

 the Indian and Australian regions — mostly of marine forms. 



The Chairman showed two examples of Untax ciuereo-niger sent from 

 Mentone by the Rev. J. E. Somerville, B. D., both of the black form, var. 

 >/iaura. He also exhibited Plaiioibis Uneatits from Scotter Common, North 

 Lincolnshire, sent by Mr. F. W. Fierke, of Hull, and Testacella inaiigei 

 from Bridgewater, Somerset, sent by Mr. Corder, in whose garden the 

 species is abundant. He also brought a number of Sutherlandshire shells 

 sent by Mr. W. Baillie, of Brora. 



Mr. W. Nelson, M.C.S., exhibited a very large example of Limn(Fa 

 glutinosa, also Planorbis corneus, LiniiitTa ovata, SphiPiiiti/i corneiim, and 

 Valvata piscinalis, all from the Skidby Drain, near Hull, and Helix 

 neinoralis from Primrose Valley, Leeds. 



Various Limnaeidaj from Scotland were exhibited on behalf of Mr. Thos. 

 Scott, F.L.S., of Edinburgh. 



The Chairman exhibited a book in which he had tabulated the mathe- 

 matically theoretical variations caused by suppression, coalition, and inter- 

 ruption of the bands in Helix neinoralis, 1,227 in number, all of which may 

 occur in every shade of ground colour, with every colour of lip, and con- 

 currently with every other kind of variation to which the species is liable, 

 whether of form, size, texture, etc., so that it will readily be seen that the 

 range of possible variation is practically infinite. 



