﻿SO-WEUBY 
  : 
  NOTES 
  ON 
  MAGILUS 
  AND 
  ITS 
  ALLIES. 
  77 
  

  

  The 
  genus 
  Corallioha 
  seems 
  to 
  have 
  little, 
  if 
  any, 
  affinity 
  with 
  

   Magilus. 
  I 
  have 
  a 
  specimen 
  in 
  situ, 
  and 
  instead 
  of 
  occupying 
  a 
  

   crypt 
  it 
  is 
  firmly 
  fixed 
  on 
  the 
  top 
  of 
  the 
  raeandrina, 
  almost 
  appearing 
  

   to 
  be 
  a 
  part 
  of 
  the 
  coral, 
  and 
  there 
  remains 
  underneath 
  but 
  a 
  small 
  

   hiatus 
  for 
  the 
  projection 
  of 
  the 
  head 
  and 
  tentacles. 
  There 
  are 
  

   specimens 
  in 
  the 
  British 
  Museum 
  unattached, 
  but 
  they 
  have 
  the 
  

   same 
  characters. 
  

  

  CORALLIOBIA 
  ROBILLARDI 
  (Licuard). 
  

  

  Leptoconchus 
  robillardi, 
  Lienard, 
  Journ. 
  de 
  Conch., 
  vol. 
  xviii, 
  1870, 
  

   p. 
  305. 
  

  

  The 
  surface 
  of 
  this 
  shell 
  is 
  strongly 
  elaborately 
  cancellated. 
  The 
  

   cancellating 
  ridges 
  are 
  closer 
  and 
  less 
  elevated 
  than 
  in 
  C.Jimhriafa. 
  

   Its 
  anterior 
  end 
  is 
  produced, 
  forming 
  a 
  rostrum 
  and 
  canal. 
  

  

  This 
  species 
  has 
  been 
  called 
  a 
  variety 
  of 
  C.fimbriata, 
  but 
  having 
  

   seen 
  a 
  large 
  number 
  of 
  specimens 
  it 
  appears 
  to 
  me 
  specifically 
  

   distinct. 
  

  

  Genus 
  Magilopsis, 
  nom. 
  nov. 
  Tj^pe. 
  — 
  Leptoconchus 
  lamarcici, 
  

   Deshayes, 
  in 
  Maillard, 
  I. 
  de 
  la 
  lleunion, 
  ed. 
  2, 
  He, 
  p. 
  127, 
  pi. 
  ii, 
  

   figs. 
  1-3. 
  

  

  I 
  cannot 
  place 
  this 
  remarkable 
  form 
  with 
  3Iagihis, 
  and 
  since 
  the 
  

   name 
  Lepioco7ichus 
  cannot 
  now 
  be 
  used 
  a 
  new 
  generic 
  name 
  is 
  

   necessary. 
  

  

  The 
  shell 
  is 
  an 
  elongated 
  pyriform, 
  with 
  an 
  elate 
  rounded 
  spire 
  

   and 
  a 
  rather 
  long 
  rostrum 
  at 
  the 
  anterior 
  end. 
  The 
  operculum, 
  

   which 
  I 
  have 
  seen 
  in 
  many 
  specimens 
  collected 
  by 
  M. 
  V. 
  de 
  

   llobillard, 
  of 
  Mauritius, 
  is 
  of 
  a 
  thin 
  transparent 
  substance, 
  fitting 
  in, 
  

   and 
  nearly 
  filling 
  the 
  aperture 
  of 
  the 
  shell 
  ; 
  it 
  is 
  finely 
  concentrically 
  

   laminated, 
  narrowed 
  at 
  each 
  end, 
  with 
  its 
  nucleus 
  near 
  the 
  right- 
  

   hand 
  side. 
  

  

  M. 
  MAiLLARDi, 
  Desliayes, 
  in 
  Maillard, 
  I. 
  de 
  la 
  Eeunion, 
  ed. 
  2, 
  iis, 
  

   p. 
  124 
  {Leptoconchus), 
  pi. 
  xii, 
  figs. 
  28, 
  29. 
  

  

  I 
  cannot 
  pronounce 
  with 
  any 
  certainty 
  on 
  the 
  position 
  of 
  this 
  

   curious 
  shell, 
  but, 
  since 
  it 
  has 
  much 
  the 
  look 
  of 
  an 
  abnormality, 
  

   I 
  place 
  it 
  here, 
  and 
  it 
  may 
  prove 
  to 
  be 
  an 
  abnormal 
  form 
  of 
  

   M. 
  lamarcici. 
  

  

  In 
  conclusion 
  I 
  note 
  that 
  M. 
  Deshayes' 
  informs 
  w^ 
  ihdit 
  3Iagihis 
  

   has 
  an 
  operculum, 
  and 
  that 
  Leptoconchus 
  has 
  none. 
  Now 
  it 
  is 
  a 
  

   curious 
  fact 
  that 
  hundreds 
  of 
  specimens 
  having 
  passed 
  through 
  my 
  

   hands 
  during 
  more 
  than 
  half 
  a 
  century 
  I 
  have 
  never 
  seen 
  the 
  

   operculum 
  of 
  a 
  Magilus 
  ; 
  while 
  at 
  least 
  one 
  of 
  M. 
  Deshayes' 
  species 
  

   of 
  Leptoconchus 
  is, 
  as 
  I 
  have 
  shown, 
  distinctly 
  operculate. 
  There 
  are 
  

   two 
  other 
  species 
  regarded 
  as 
  Leptoconchus, 
  viz. 
  Coralliobia 
  Jimhriata 
  

   and 
  C. 
  robillardi, 
  having 
  opercula. 
  The 
  opercula 
  of 
  these 
  species 
  

   are 
  very 
  small 
  in 
  comparison 
  with 
  the 
  aperture 
  of 
  the 
  shells, 
  

   measuring 
  scarcely 
  4x2 
  mm., 
  very 
  thin 
  and 
  transparent. 
  

  

  ' 
  Deshayes 
  in 
  Maillard, 
  I. 
  de 
  la 
  Keunion, 
  vol. 
  ii 
  E, 
  p. 
  118, 
  

  

  