﻿128 
  PROCEEDINGS 
  OF 
  THE 
  MALACOI,OGICAL 
  SOCIETY. 
  

  

  (Drap.) 
  are 
  spherical, 
  1 
  'To 
  mm. 
  in 
  diameter, 
  and 
  very 
  delicate. 
  He 
  

   states 
  that 
  they 
  are 
  laid 
  in 
  clusters 
  of 
  between 
  30 
  and 
  60 
  during 
  the 
  

   summer, 
  the 
  young 
  being 
  hatched 
  in 
  about 
  15 
  or 
  20 
  days, 
  

  

  Distribution. 
  — 
  This 
  species 
  is 
  most 
  abundant 
  in 
  the 
  South-West 
  of 
  

   France, 
  where 
  it 
  seems 
  to 
  take 
  a 
  place 
  similar 
  to 
  that 
  occupied 
  by 
  

   Uygromia 
  striolata 
  (Pfeitf.) 
  in 
  the 
  South 
  of 
  England. 
  It 
  also 
  occurs 
  

   in 
  the 
  North 
  of 
  Spain, 
  in 
  Central 
  France, 
  and 
  at 
  Dieppe 
  and 
  a 
  few 
  

   other 
  places 
  in 
  the 
  North 
  of 
  France, 
  where 
  it 
  may 
  possibly 
  have 
  been 
  

   introduced 
  by 
  nutn. 
  Ferussac 
  said 
  that 
  it 
  was 
  also 
  found 
  in 
  Italy 
  

   and 
  Sicily,' 
  while 
  Gray 
  stated 
  that 
  its 
  distribution 
  extended 
  into 
  

   Switzerland 
  and 
  Germany,- 
  but 
  these 
  records 
  are 
  possibly 
  erroneous. 
  

  

  The 
  history 
  of 
  the 
  discovery 
  of 
  Ilygromia 
  limlata 
  (Drap.) 
  in 
  the 
  

   British 
  Isles 
  has 
  already 
  been 
  given 
  by 
  Kennard 
  & 
  Woodwiird.' 
  

   The 
  species 
  was 
  recorded 
  many 
  years 
  ago 
  on 
  the 
  authority 
  of 
  

   Sowerby 
  as 
  occurring 
  by 
  the 
  New 
  North 
  lload 
  near 
  Hampstead, 
  but 
  

   the 
  specimens 
  that 
  were 
  found 
  there 
  had 
  probably 
  been 
  introduced, 
  

   like 
  a 
  single 
  example 
  more 
  recently 
  found 
  in 
  gardens 
  at 
  Belfast. 
  In 
  

   Devonshire, 
  however, 
  the 
  species 
  seems 
  to 
  be 
  a 
  native, 
  for 
  since 
  

   Mr. 
  Kennard 
  discovered 
  it 
  in 
  1917 
  at 
  Coombe 
  in 
  Teignhead, 
  near 
  Teign- 
  

   moutb, 
  numerous 
  specimens 
  have 
  been 
  found 
  on 
  roadside 
  banks 
  over 
  

   a 
  considerable 
  area 
  on 
  both 
  sides 
  of 
  the 
  River 
  Teign. 
  Mr. 
  Kennard 
  

   informs 
  me 
  that 
  he 
  has 
  found 
  it 
  most 
  commonly 
  amongst 
  ivy 
  on 
  the 
  

   roots 
  of 
  elms, 
  but 
  that 
  it 
  also 
  occurred 
  under 
  heaps 
  of 
  cut 
  herbage. 
  

  

  Affinities. 
  — 
  There 
  can 
  be 
  no 
  doubt 
  that 
  the 
  snails 
  from 
  Devon- 
  

   shire 
  are 
  rightly 
  assigned 
  to 
  Hj/gromia 
  limhata 
  (Drap.). 
  It 
  is 
  true 
  

   that 
  there 
  are 
  a 
  few 
  slight 
  diiFerences 
  between 
  tlieir 
  anatomy 
  and 
  

   Moquin-Tandon's 
  illustrations 
  of 
  the 
  organs 
  of 
  this 
  species, 
  but 
  

   French 
  specimens 
  that 
  the 
  writer 
  lias 
  dissected 
  agree 
  more 
  exactly 
  

   with 
  the 
  English 
  examples 
  than 
  with 
  the 
  French 
  author's 
  figures. 
  

   And 
  although 
  the 
  majority 
  of 
  the 
  shells 
  from 
  Devonshire 
  are 
  

   certainly 
  a 
  little 
  smaller 
  and 
  browner 
  than 
  most 
  of 
  the 
  Continental 
  

   specimens, 
  the 
  smallest 
  French 
  shells 
  are 
  considerably 
  less 
  than 
  the 
  

   average 
  size 
  of 
  the 
  British 
  specimens, 
  and 
  the 
  biown 
  variety 
  is 
  not 
  at 
  

   all 
  uncommon 
  in 
  many 
  parts 
  of 
  France, 
  the 
  percentage 
  of 
  shells 
  

   belonging 
  to 
  this 
  variety 
  varying 
  in 
  different 
  places. 
  Thus, 
  according 
  

   to 
  Moquin-Tandon, 
  26 
  per 
  cent, 
  belong 
  to 
  the 
  var. 
  sarratina 
  at 
  

   Blagnac 
  near 
  Toulouse, 
  and 
  37 
  per 
  cent, 
  near 
  Muret, 
  only 
  thirteen 
  

   miles 
  away. 
  Probably 
  the 
  darker 
  mutations 
  are 
  favoured 
  by 
  a 
  com- 
  

   paratively 
  cool 
  and 
  moist 
  climate. 
  

  

  Ilygromia 
  limhata 
  (Drap.) 
  is 
  very 
  different 
  from 
  any 
  other 
  British 
  

   species. 
  The 
  English 
  specimens, 
  it 
  is 
  true, 
  resemble 
  M. 
  striolata 
  

   (Pfeiff.) 
  in 
  size 
  and 
  colour, 
  and 
  may 
  have 
  been 
  mistaken 
  for 
  that 
  

   species 
  when 
  viewed 
  from 
  above 
  in 
  the 
  field. 
  But 
  H. 
  striolata 
  

   (Pfeiff.) 
  differs 
  widely 
  from 
  II. 
  limhata 
  (Drap.) 
  in 
  its 
  smaller 
  aperture 
  

   and 
  much 
  larger 
  umbilicus, 
  in 
  the 
  microscopical 
  sculpture 
  of 
  its 
  

   shell, 
  in 
  its 
  paired 
  dart-sacs 
  and 
  accessory 
  sacs 
  and 
  its 
  globular 
  

  

  ^ 
  Hist. 
  Nat. 
  Moll. 
  terr. 
  et 
  fluv. 
  de 
  France, 
  vol. 
  i, 
  p. 
  201. 
  

  

  ~ 
  Turton's 
  Man. 
  Land 
  and 
  Freshwater 
  Shells, 
  2nd 
  ed., 
  1840, 
  p. 
  143. 
  

  

  * 
  Proc. 
  Mai. 
  Soc, 
  vol. 
  xiii, 
  1918, 
  pp. 
  14, 
  15. 
  

  

  