24^ JOURNAL OF CONCHOLOGY, VOL. 10, NO. 8, OCTOBER, I902. 



during the early life of the mollusk, and the consequent deviation of 

 the whorl from its normal course of growth. Figs. 17-19 show that 

 normal shells may attain half or more of their growth before develop- 

 ing scalarity. I'he locality is exposed and open to the Atlantic gales, 

 and any person who has seen the clouds of storm-driven sand, which 

 sweep over the desert area of the dunes, forming a natural sand-blast, 

 speedily denuding even the living shells of their epidermis, will readily 

 see that this may be a possible cause of the phenomenon. 



PROCEEDINGS OF THE 

 CONCHOLOGICAL SOCIETY OF GREAT BRITAIN & IRELAND. 



311th Meeting, June nth, 1902. 



Mr. Edward Collier in the chair. 



Donations to the Library announced and thanks voted : 



The usual periodicals received in exchange. 



New Members Elected. 

 Mr. Travis Hampson, Nuthursc, Hartopp Road, Four Oaks, Sutton Coldfield. 

 Mr. C. W. Vincent, 39, West Bank, Stamford Hill, London, N. 



Candidate Proposed for Membership. 



Mr. Raleigh S. Smallman. 



Papers Read. 



" Two Points in Nomenclature," by W. E. Hoyle. 



" The Census of the British Land and Freshwater MoUusca," by L. E. Adams. 



'^ Helix rotundata m. sinistronum Taylor, at Castleton, Derbyshire," by J. W. 

 Jackson. 



Exhibits. 



By Mr. J. W. Jackson : A set of Cypma tigris from Cape York, Australia, 

 remarkable for their rich dark almost black colour, shells medium size, but very 

 heavy, solid, and somewhat flattened ; also a living sinistral Helix rotundata from 

 Castleton, Derbyshire. 



By Mr. F. Taylor : Young fry of Palndestrina taylori ; Azeca tridens Romiley, 

 Cheshire ; Clausilia biplicata, Barnes Bridge, Middlesex ; CI. rolphi. Helix rotun- 

 data type and var. allia, with a curious intermediate form, shewing faint red stripes 

 on a white shell ; Bnliminns obscunts type and var. albina ; Hyalinia nitidula 

 type and var. heltnii, all from Bastal \Vood, Kent ; some curious monstrosities of 

 Physa heterostropha, Dukinfield Canal ; Physa acuta from lily tanks, Kew ; an un- 

 determined species of Opeas found plentifully in Kew Gardens .; Hyalinia alliaria 

 var. , Hy. pnra var. nilidosa from Bardsley. 



By Mr. J. W. Baldwin : Pisidiuni ainnicuin and Valvata piscinalis, Ringley 

 Canal ; and Paludestrina jenkinsi from Canal at Dixon Fold, near Bolton. 



By Mr. J. D. Dean : An interesting series of Helix nemoj-alis, H. hortensis, H. 

 arbustorum and var. flavescens, H. rotundata, H rupestris, H. hispida, H. lapicida, 

 Hyalinia alliaria, Hy. cellaria, Hy. crystallina, Hy. nitidula, Azeca tridens, Pupa 

 cylindracea, Clatisilia perversa and var. cravenensis, from the Malham district, also 

 ZzV««tfa/t7-t^> a (striated variety), L. stagnalis, L. truncalula, Planorbis contort us, 

 Valvata piscinalis, Spliceriuin corneuin, and Pisidium aninicum from Malham Tarn ; 

 Ancylus fluviatilis from Malham Cove. 



A large number of locality sets and local forms of all the British Hyalinicc, to- 

 gether with continental examples of critical si^ecies for comparison, were exhibited 



