﻿132 
  

  

  PROCEEDINGS 
  OF 
  THK 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  Total 
  

  

  31 
  

  

  46 
  

  

  77 
  

  

  VI. 
  Colour 
  Vakiation 
  in 
  Shell, 
  

  

  Among 
  the 
  317 
  mature 
  specimens 
  were 
  64 
  (20 
  per 
  cent) 
  of 
  the 
  pale 
  

   form 
  (var. 
  ochfoleuca) 
  and 
  in 
  the 
  77 
  immature 
  16 
  (21 
  percent) 
  ; 
  there 
  

   is 
  no 
  evidence 
  that 
  this 
  variety 
  has 
  any 
  rehitionship 
  to 
  size 
  or 
  sex 
  : 
  — 
  

  

  Total. 
  215 
  39(18%) 
  179 
  41(22%) 
  

  

  394 
  

  

  SO 
  

  

  20% 
  

  

  VII. 
  SUMMAEY. 
  

  

  (a) 
  Females 
  are 
  larger 
  than 
  males. 
  

  

  {b) 
  There 
  is 
  no 
  difference 
  in 
  shape 
  nor, 
  allowing 
  for 
  size, 
  in 
  weight. 
  

  

  (c) 
  The 
  female 
  radula 
  is 
  longer, 
  but 
  has 
  not 
  more 
  teeth, 
  than 
  the 
  

   male 
  radula. 
  

  

  (d) 
  The 
  var. 
  ochroleuca 
  has 
  no 
  se.vual 
  significance. 
  

  

  