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  NOTES. 
  

  

  Lakta 
  of 
  a 
  Dipterous 
  Fly 
  feeding 
  on 
  Helicella 
  itala. 
  {Read 
  

   8th 
  June, 
  1917.) 
  — 
  Some 
  time 
  since 
  I 
  found 
  a 
  number 
  of 
  dead 
  and 
  

   moribund 
  II. 
  itala 
  on 
  the 
  common 
  by 
  Chipstead 
  Station 
  in 
  Surrey 
  which 
  

   were 
  apparently 
  being 
  destroyed 
  by 
  some 
  dipterous 
  larvae. 
  Some 
  of 
  the 
  

   imagines 
  were 
  bred 
  out, 
  and 
  have 
  kindly 
  been 
  identified 
  by 
  Mr. 
  K. 
  G. 
  

   Blair 
  of 
  the 
  British 
  Museum 
  as 
  Sarcopkaga 
  nigriventris, 
  Meade. 
  The 
  

   causes 
  of 
  death 
  among 
  the 
  mollusca 
  are 
  so 
  little 
  understood 
  that 
  this 
  

   identification 
  seems 
  worth 
  recording. 
  E. 
  W. 
  Bowell. 
  

  

  Note 
  on 
  Csioceras 
  bowerbankii 
  (J, 
  de 
  C. 
  Soweubt). 
  [Read 
  

   8th 
  June, 
  1917.) 
  — 
  A 
  fine 
  example 
  of 
  Crioceras 
  lowerlanHi 
  was 
  

   recently 
  unearthed 
  by 
  me 
  from 
  the 
  Lower 
  Greensand 
  deposits 
  (= 
  Aptian) 
  

   of 
  Walpen 
  Chine, 
  off 
  the 
  southern 
  coast 
  of 
  the 
  Isle 
  of 
  Wight. 
  It 
  reminded 
  

   me 
  of 
  the 
  type-specimen 
  of 
  this 
  species 
  recently 
  refigured 
  by 
  Mr. 
  Crick 
  

   in 
  the 
  Proceedings 
  of 
  the 
  Society, 
  which 
  1 
  think 
  must 
  have 
  been 
  obtained 
  

   from 
  the 
  same 
  locality. 
  The 
  dimensions 
  of 
  my 
  specimen 
  are 
  17 
  in. 
  x 
  15 
  in.,, 
  

   or 
  a 
  little 
  in 
  excess 
  of 
  those 
  of 
  the 
  type. 
  L. 
  W. 
  Wilmer. 
  

  

  On 
  Volvaria 
  lubrica, 
  Petterd. 
  (Read 
  8th 
  June, 
  1917.) 
  — 
  This 
  

   species 
  was 
  described 
  by 
  Petterd 
  in 
  the 
  Journ. 
  of 
  Conch., 
  iv, 
  p. 
  143, 
  1884, 
  

   as 
  follows 
  : 
  — 
  

  

  " 
  Shell 
  minute, 
  ovately 
  cylindrical, 
  brownish, 
  smooth, 
  shining, 
  trans- 
  

   lucent 
  : 
  whorls 
  3, 
  rounded 
  : 
  aperture 
  narrow, 
  slightly 
  increasing 
  in 
  width 
  

   towards 
  anterior 
  margin, 
  where 
  there 
  is 
  a 
  single 
  fold 
  forming 
  its 
  reflexed 
  

   margin 
  : 
  outer 
  lip 
  simple 
  : 
  spire 
  scarcely 
  elevated. 
  Long. 
  2 
  mm., 
  lat. 
  

   l^mm. 
  

  

  " 
  Habitat, 
  Brown's 
  River, 
  dredged 
  in 
  about 
  6 
  fathoms." 
  

  

  It 
  is 
  quoted 
  in 
  Tate 
  & 
  May's 
  " 
  Revised 
  Census 
  of 
  the 
  Marine 
  Mollusca 
  

   of 
  Tasmania 
  ", 
  Proc. 
  Linn. 
  Soc. 
  New 
  South 
  Wales, 
  xxvi, 
  1901, 
  p. 
  363, 
  as 
  

   above, 
  without 
  further 
  information, 
  and 
  in 
  a 
  letter 
  dated 
  December 
  5, 
  1916, 
  

   Dr. 
  May 
  says: 
  — 
  " 
  Jf 
  . 
  lubrica, 
  Pett., 
  type 
  lost, 
  and 
  no 
  other 
  specimen 
  

   known. 
  It 
  may 
  yet 
  be 
  found, 
  but 
  it 
  is 
  to 
  me 
  a 
  rather 
  doubtful 
  species." 
  

   The 
  missing 
  type 
  has 
  now 
  been 
  found, 
  among 
  Messrs. 
  Sovverby 
  & 
  Fulton's 
  

   stock 
  of 
  MarginellidEe, 
  in 
  a 
  box 
  purchased 
  at 
  the 
  C. 
  E. 
  Beddome 
  sale, 
  and 
  

   labelled 
  underneath 
  in 
  that 
  collector's 
  writing. 
  " 
  Volvaria 
  lubrica, 
  Pett., 
  

   Tasmania." 
  I 
  believe 
  that 
  Beddome 
  when 
  living 
  at 
  Hobart 
  used 
  to 
  

   purchase 
  specimens 
  from 
  Petterd. 
  The 
  specimen 
  tallies 
  well 
  with 
  the 
  

   description, 
  is 
  a 
  live 
  shell 
  and 
  has 
  the 
  animal 
  still 
  inside 
  — 
  hence 
  the 
  

   " 
  brownish" 
  colour, 
  but 
  on 
  cleaning 
  the 
  aperture 
  carefully 
  I 
  found 
  it 
  to 
  be 
  

   triplicate, 
  the 
  uppermost 
  fold 
  being 
  very 
  faint. 
  Hedley 
  records 
  a 
  similar 
  

   inaccuracy 
  in 
  the 
  figure 
  of 
  the 
  type-specimen 
  of 
  M. 
  angasi, 
  Crs. 
  (Proc. 
  

   Linn. 
  Soc. 
  New 
  South 
  Wales, 
  xxxix, 
  1914, 
  p. 
  726). 
  Petterd's 
  shell 
  is 
  

   closely 
  related 
  to 
  M. 
  angasi, 
  but 
  the 
  material 
  at 
  my 
  disposal 
  does 
  not 
  

   lead 
  me 
  to 
  unite 
  them. 
  Mr. 
  Fulton 
  has 
  asked 
  me 
  to 
  place 
  this 
  unique 
  

   type 
  in 
  the 
  British 
  Museum. 
  J. 
  R. 
  Le 
  B. 
  Tomlin. 
  

  

  