Vol. XV. Part VI. 



OCTOBER, 1923. 



Price 10s. net. 



P R O C E E D I IST G S 



MALACOLOGICAL SOCIETY 



OF LONDON. 



Edited by B. B. WOODWAED, F.L.y., etc., 

 Under the direction of the Ptiblication Committee. 



AUTHORS ALONE ARE RESPONSIBLE FOR THE STATEMENTS IN THEIR RESPECTIVE 



PAPERS. 



GOn^TEH^TS 



Proceedings : — page 



Ordinary Meetings : 



May 11th, 1923 266 



June 8th 266 



Papers : — 



On the external characters of 



Sinum planulatum (Eecl.). 



By G. C. EOBSON, F.Z.S. 



(Fig.) 268 



Masculine deficiencies in the 



British Vertigininae. By H. 



Watson, M. A. (Figs.) 270 



The presence of a Sub-cerebral 



Commissure in the Orthu- 



rethra. ByH. Watson, M. A. 280 

 The Anatomy and affinities of 



OchthephilaturriculaCLo-^ie). 



ByH. Watson, M. A. (PI. VI.) 283 



Papers continued : — p 



On the British Species of 



Truncatellina. By A. S. 



Kennard, F.G.S., & B. B. 



Woodward, F.L.S 



Note on the Nomenclature and 



Systematic Arrangement of 



the Clausiliidse. By A. S. 



Kennard, F.G.S., & B. B. 



Woodward, F.L.S 



On Ttirris (Surcula) macella, 



nom. nov. for T. macilenta, 



Melv. By Dr. J. Cosmo 



Melvill, F.L.S 



Some Synonyms in the 



Venerid£e. By J. E. le B. 



T0MLIN,F.E.S 



294 



298 



809 



810 



Index 315 



Title-page, etc. 



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