PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 45 



President.— G. K. Glide, F.Z.S. 



Vice-Presidents.— R. 0. N. Shaw, B.Sc, F.Z.S. ; T. Iredale ; 

 J. R. le B. Tomlin, M.A., F.E.S. ; A. S. Kennard, F.G.S. 



Treasurer. — R. Biillen Newton, F.G.S. 



Editor. — B. B. Woodward, F.L.S., etc. 



Secretary. — A. E. Salisbury. 



Six other Members of the Council. — A. Reynell ; C. Oldliam, 

 F.L.S. ; Major M. Connolly ; H. Woods, M.A., F.G.S. ; Rev. A. H. 

 Cooke, Sc.D., M.A., F.Z.S. ; H. H. Bloomer, F.L.S. 



On the motion of Dr. Bowell, seconded by Dr. Boycott, 

 a unanimous vote of thanks was passed to the retiring Officers and 

 Members of the Council, the Auditors, and the Scrutineers. 



ORDINARY MEETING. 

 Friday, 13th February, 1920. 



G. K. Gtjde, F.Z.S., President, in the Chair. 



Mr. Henrich Christian Sell was elected to membership of the 

 Society. 



The President then delivered his address on " The Armature of 

 Land Mollusca ". 



On the motion of Dr. Cooke, seconded by Mr. Crick, a vote of 

 thanks to the President for his address was passed, with a request 

 that he would allow the same to be j)rinted, as far as possible, in 

 extenso in the " Proceedings " of the Society. 



ORDINARY MEETIING. 

 Friday, 12th March, 1920. 



G. K. GuDE, F.Z.S., President, in the Chair. 

 The following communications were read : — 



1. "A note on Xylojohaga prcestans, Smith." By J. R. le B. 

 Tomlin, M.A., F.E.S. 



2. " Notes on the Coloration of the shell of Helix aspersa and of 

 Cochlicella harhara." By Hugh Watson. 



The brown pigment in the shell of Helix asjpersa is usually 

 concentrated into spiral bands, homologous with those of 

 H. nemoralis, etc. ; although these bands are partly concealed, 

 owing to the fact that the pale, opaque, substance of the shell 

 crosses them in irregular streaks, instead of being confined to 

 the zones between the dark bands, thus making the shell 

 less conspicuous. But the stage of growth at which the 

 pigment first becomes concentrated into distinct bands varies 

 greatly. In some specimens the dark bands first appear before 

 the middle of the second whorl, that is to say, close to the 

 apex of the shell ; in others, only the last whorl is distinctly 

 banded. Moreover, breeding experiments show that this marked 

 difference is hereditary ; and that the mutation in which the 

 bands develop late is apparently dominant to that in which 



