2l8 JOURNAL OF CONCMOLOCJY, VOL. I5, NO. 7, AUGUST 15, I917. 



By Mr. J. W. Jackson : Five pearls taken from one specimen of Myiilus edulis, 

 the largest specimens measuring 4*3 x 4 and 67 x 4"7 mm. 



By Mr. Chas. Oldham : Helicella gigaxii var. alba and var. hyalozonata, Deans- 

 hanger, Northants. ; Helix aspersa var. exalbida and var. rufulozonata, Tring ; 

 Helix horfensis var. lilacina, Tring ; Helicella itala var. hyalozonata, Aldl)ury 

 Owers ; Sphceriiim cornetim \2cc. flavescens, Llyn Padarn, Carnarvonshire ; Helici- 

 gona arbiistoriim var. fragilis (of Wattebled not of Esmark), wet rocks at 2,000 feet 

 in Cwm Idwal ; Limncca pereger var. membranacea Porro, Llyn Glas, Cwm 

 Clogwyn, Snowdon, 1,740 feet; Ancylus jfluviatilis and Pisidium personatum, 

 Llyn Glas, Cwm Glas, Snowdon, 2,250 feet ; P. casertannm, peaty pool in Cwm 

 Clogwyn ; P. personatuvt, Mochras Island. To illustrate notes : Pisidium 

 hibernicuDi, Llyn Dwythwch, near Llanberis ; Pisidium lilljeborgi, Marchlyn Bach, 

 near Bethesda, and Llyn Peris. 



In the Special Exhibit of the genus Rhysota many species were shown from the 

 collections of Mr. E. Collier, Mrs. Gill, and the Manchester Museum, and an 

 interesting discussion followed. 



460th Meeting', held at the Manchester Museum, March 14th, 1917. 



Mr. E. Collier in the chair. 



Additions to the Library announced and thanks voted : 



" Summary of the Mollusks of the Family Alectrionidse of the West Coast of 

 America," by W. H. 'Da.W (from the autho)); and the usual periodicals received in 

 exchange. 



Donations to the Cabinet from Dr. R. F. Scharff were announced, and 

 thanks voted. 



New Member Elected. 



Duncan Keogh. 



Papers Read. 



"The Value of Debris Sifting in collecting Minute Mollusca," by H. Beeston. 



"Notes and Observations on the Non-marine Mollusca of Llandudno and 

 district," by H. Beeston. 



'^ Photinula wacei, sp. nov.., from the Falkland Isles," by J. C. Melvill and R. 

 Standen. 



"The Clausium in Alopia, a sub-genus of Clausilia" by J. D. Dean. 



Exhibits. 

 By Mrs. Gill : A large number of Liparus. 

 By Mr. E. Collier : A large series of Alopia. 



By Mr. W. H. Davies : Species of Chilostoma ; and local freshwater shells. 

 In the Special Exhibit of Ariophanta many species were shown by Mrs. Gill, 

 Mr. E. Collier, and Mr. R. Standen. 



It was decided to have the following Special Exhibits : — 



April nth - - The Genus Obba. 



May 9th - - The Genus Vitrina. 



June 13th - - The Genus Helicarion. 



461st Meeting, held at the Manchester Museum, April nth, 1917. 



Mr. E. Collier in the chair. 



Paper Read. 



" On the Occurrence of Flatiorbis dilatatiis and Physa heterostropha at 

 Oldham," by F. Taylor. 



