8S JOURNAL OF coxciioLO(.;\', \-oi.. lo, NO. 3, j'JLv, 1901. 



300th Meeting-, May 8th, 1901. 



Mr. Thomas Rogers in the chair. 



Donations to the Library announced and thanks voted : 



The usual periodicals received in exchange. 



New Member Elected. 

 Mr. Charles Smith Carter, 172, Easlgale, I.oulh, Lines. 



Candidate Proposed for Membership. 

 •Mrs. Charlotte E. Gubbins. 



Exhibits. 

 By Mr. R. Cairns: LlmiuBa stagnalis, with refliexed lip from Hurst, Ashton- 

 under-Lyne. Trivia Jorinosa Gask., from Cape Colony, collected by Dr. Beever. 

 By the Manchester Museum : Claiisili(E from Japan and China. 

 By Mr. Laidlaw: Rhyostoma haincsi from Lower Siam. and a small shell allied 

 to Plectopylis or Streptasis from the same locality. 



By Mr. Moss: Two specimens of Pltclopylis, one being apparently viviparous. 

 Helix miiralis from Italy and the dart extracted from it. 

 It was resolved to have a 



Special Exhibit of the genus Pleurodonta 

 at the next meeting. 



NOTICE BY THE COMMITTEE FOR COLLECTIVE 

 INVESTIGATION. 



(Read before the Societ}-, June 12. 1901). 



In accordance with the scheme which has been adopted by the 

 Committee, a second series of five subjects for enquiry is now 

 published. The Committee would remind members that extensive 

 co-operation is necessary to render the scheme a success, and would 

 request members to accord them- abundant assistance and support, 

 i. Are Vallonia pickhella and the form costata found together or 

 separately ? in wet or moist situations ? do intermediate forms 

 occur? does each form affect a particular kind of habitat? 

 ii. Do Tachea nemoralis and T. horteusis occur together or 

 separately? (i) in the same district, (2) in the same locality, 

 (3) in the same kind of habitat? 

 iii. Do Claitsilia rugosa {bidentatd) and Balea perversa occur 



together? what habitats are they usually found in? 

 iv. Are there any constant differences between the raduL^ of (i) 

 Hyalmia cellaria and H. ailiaria, (2) Limnaa peregra and L. 

 (iiiricularia, (3) Succinea putris and 6". elegans, (4) Tachea 

 horteusis and T. nejiioralis} 

 V. Record the circumstances attending the periodical disappearance 

 to which certain species, such as A. glutinosa, If. fus-a and K 

 edeniula, are subject. How are such disappearances to be 

 accounted for? 

 Returns should reach the Secretary (A. E. Boycott, The (irange, 

 Hereford), not later than September ist, 1902. 



