284 JOURNAL Ot CONCHOLOGY, VOL. 1 5, NO. 9, MAY 1ST, I918. 



471st Meeting, held at the Manchester Museum, April loth, 1918. 

 Mr. B. R. Lucas in the chair. 



Candidates Proposed for Membership. 



Hans Schlesch, c/o. Nyt Apotek, Nestved, Denmark (introduced by C. Oldham 

 and W. Denison Roebuck). 



Miss Lucia D. Carro, Monmouth House, Topsham, R.S.O., Devon (introduced 

 by C Oldham and L. E. Adams). 



Member Deceased. 

 Hy. Champ. 



Exhibits. 



By Mrs. Gill : Species of Ssletellina. 



By Mr. C. H. Moore: Various shells from Dyserth, N. Wales. 



By Mr. G. C. Spence : Species of Urocoptis. 



By Mr. \V. E. Alkins : Helix nemoralis (vars. ), H. arbtistorum, Balea perversa, 

 Clatisilialatninata, Lintmvastagnalis, 3.ndi Ancylusfluviatilisixova Oakamoor, Staffs. ; 

 Limiuta glaber Ixoxw a ditch on Caldon Low (alt. 1,100 feet), Staffs.; H. arbtistorum 

 from Gatley Carrs, Cheshire ; and other shells. 



In the Special Exhibit, Pteropoda, series were shown by Messrs. R. Standen, 

 J. G. Kitchen, Mrs. Gill, and the Manchester Museum. 



Note on the var, fascialba Taylor of H. nemoralis L. — Mr. Hugh Watson 

 has very kindly suggested to me that the opaque white peripheral band in H. 

 nemoralis was due to the expulsion of the white ground colouring of the shell from 

 the area of the brown transparent banding and its consequent thickening along the 

 edge of the latter. I have therefore collected a great number of the vars. cuvieria 

 and guettardia of Moquin-Tandon — the 00300 forms with red and yellow grounds — 

 and tind that in almost every case both red and yellow specimens show the white 

 banding, so that in this district at least the theory of an atavic origin would 

 necessitate the acceptance of an atavic feature becoming an almost invariable rule. 

 Secondly, the white band, when the shell is held against the light, is clearly seen 

 to follow the transparent brown banding in density, thickening where it thickens 

 and disappearing should it fail altogether. INIoreover I have taken specimens in 

 which, the white banding has broken up into broad masses owing to some inter- 

 ruption of the flow during growth, so that the atavic white band assumes the aspect 

 of a ring of white flocculations where the opaque ground colour has been irregu- 

 larly expelled from the transparent area. This seems to me almost decisive as to 

 the purely normal nature of the feature. The fact that the white banding is not 

 noticeable on five-banded specimens may perhaps be explained by the fact that 

 the expulsion of opaque matter on either side of the normal banding would be wide 

 enough in extent to cover the whole space between two bands, thus only appearing 

 as a slight thickening of the pale ground-work. In all the specimens of 00300 

 I have taken— and it almost equals the type in frequency round here— the opaque 

 band is visible in every case save in those where the ground colour is exceptionally 

 dense and pale.— J. E. A. Jolliffe {Read before the Society, Sept. 8th. 1915). 



