PROCEEDINGS : OCTOBER 20, I906. I3 



By Mr. W. Hy. Heathcote : Sinistral specimens, including, Helicodonta obvoluta 

 from Ditcham ; Helix neinoralis from Bundoran ; H. po/natta ; H. aspersa from 

 Bristol ; Limnaa peregra from near Leeds ; and Buccinttm iindattim from the East 

 Coast. Photographs of Avion ater var. alba. Fern Hill, Grange-over-Sands. 

 Helicella cantiaiia collected as young shells at Bletchley in April last, and fed up. 

 A specimen of Planorbis corueus collected in 1904 when ^-in. across, and since 

 then kept alone in a small tank ; last year it deposited infertile ova, but this year 

 the ova were fertile, and a number of the young ones were shewn with the parent, 

 all quite healthy and active. 



By the Rev. Canon Horsley : Series of marine shells from lagoons, Cette, 

 France ; Candidiila caperata var. jtilva ; Helix pisana var. tenuior, Tenby ; 

 Helicella virgata var. radiata. Rye ; Helix arbtistorum var. alpicola, Wengern Alp, 

 Switzerland ; H. neinoralis var. albolabiata of various banding and colouration ; a 

 very beautiful white form of LhnncBa stagnalis with transparent bands, from River 

 Lea ; a curious turreted form of' Planorbis coniplanatus from Minster ; Physa 

 hetefostropha. Guide Bridge ; Hydrobia similis. Belvedere ; Physa fontinalis from 

 Plumstead, Heme Bay, Shortlands, and near Esher, Erith ; Aplecta hypnorum 

 from Tenby, Bickley, Ansdale, and I'lumstead Marsh ; Physa acuta from Dundee, 

 Kew Gardens and other localities, also a dextral example bred in St. Peter's 

 Rectory, Walworth, from Kew parents ; Stenogyra octona from the Tropical Fern 

 House, Kew. 



By Mr. R. Standen : (a) Two drawers of Dreissensia polymorpha with locality 

 sets from the principal British stations for this species, shewing variation and 

 influence of environment on growth of the shell, also a series of enlarged drawings 

 of the veliger stage of Dreissensia (after Korschelt and Heider), by Mrs. J. 

 Wilfrid Jackson, {b) 152 locality sets of the British Vertiginidre, including fine 

 examples of Vertigo liljeborgi from Ballinahinch Lough (Jeffreys' historic 1845 

 locality); V. angustior found alive and in beautiful condition at Roundstone, 

 Connemara, during September last, (r) A number of photographs of typical 

 habitats of Pupa and Vertigo, and photo-micrographs of all the dentate Vertigines, 

 by Mr. J. Wilfrid Jackson. {d) Exceptionally beautiful specimens of Strombns 

 ihersites Gray, from Society Islands (e coll. R. D. Darbishire) ; Valuta sophia 

 Gray, from Thursday Island (e coll. B. R. Lucas); and Trophon standeni 'Sixeh&\, 

 from Falkland Islands (coll. R. Vallentin). {e) Glochidia of Anodonta cygnea, with 

 photo-micrographs of same by Mr. J. Wilfrid Jackson ; also a fine series of young 

 shells of this Anodonta, 6 mm. to 15 mm. across, from canal at Marple, Cheshire, 

 and Dixon's Hole, Caton, near Lancaster. (/) Pediciiliiria rubida, ?)-Amo?i; P. 

 elegantissima. He de la Reunion ; P. pacifica, Kingsmill Islands ; P. sicula, in situ 

 on coral, Hyeres, France ; P. calipornica, in situ on Gorgonia and Allopra (e coll. 

 F .L. Button). 



By Mr. J. Wilfrid Jackson : {a) Growth-stages of Unio pictoruin from the canal 

 at Marple, Cheshire, illustrated by photographs of the haliitat. {h) Photo-micrographs 

 of Vallonia costata and V. excentrica. (c) Unio iiiargaritifer from the Lune, at 

 Caton, near Lancaster, with photograph of the habitat, {d) Helicigona lapicida 

 from numerous localities. {e) Series of Pahidesti-ina jenkinsi, P. taylori, P. 

 confusa, etc. , for comparison with North American, New Zealand, and European 

 Ainnicola, Hydrobia, Bythinella, Potaiitopyrgus, etc.; also photo-micrographs of 

 newly-hatched fry of Paludestrina (? A/nnicola) taylori shewing the intorted condi- 

 tion of the apex. (/) Holocene and Pleistocene Mollusca from various localities, 

 including series from Swanscombe, Ilford, Grays, Copford, etc., etc. (coll. A. S. 

 Kennard). Helix neinoralis from bone cave, Deep Dale, near Buxton, Derby- 

 shire ; Poinalias elegans. Helix neinoralis, Helicella itala, Hygroinia hispida, etc. , 



