﻿MOLLUSCA. 
  499 
  

  

  M. 
  concentrica, 
  Reeve, 
  which 
  is 
  regarded 
  by 
  some 
  authors 
  as 
  a 
  

   variety 
  of 
  this 
  species, 
  is, 
  I 
  think, 
  sufficiently 
  distinct. 
  The 
  spire 
  

   is 
  rather 
  more 
  acuminate, 
  the 
  whorls 
  are 
  not 
  angular, 
  the 
  costae 
  

   more 
  numerous 
  and 
  not 
  acutely 
  noduled. 
  

  

  54. 
  Turricula 
  (Callithea) 
  modesta, 
  Reeve. 
  

  

  Darros 
  Island, 
  in 
  22 
  fms. 
  ; 
  also 
  Mauritius 
  (Sowerhy 
  ^ 
  Lienard) 
  ; 
  

   Philippines 
  ( 
  Cumiwj). 
  

  

  55. 
  Turricula 
  (Callithea) 
  bipartita. 
  (Plate 
  XLIV. 
  fig, 
  0.) 
  

  

  Shell 
  small, 
  fusiformly 
  ovate, 
  having 
  the 
  spire 
  and 
  the 
  upper 
  

   half 
  of 
  the 
  body-whorl 
  white, 
  and 
  the 
  lower 
  half 
  stained 
  with 
  a 
  

   dirty 
  pale 
  flesh-coloured 
  band 
  beneath 
  and 
  pinkish 
  white 
  at 
  the 
  

   extremity. 
  Whorls 
  8 
  ; 
  three 
  apical 
  smooth, 
  convex, 
  the 
  rest 
  a 
  little 
  

   convex 
  at 
  the 
  sides, 
  longitudinally 
  costate 
  and 
  spirally 
  grooved. 
  

   Costae 
  about 
  14 
  in 
  number 
  on 
  the 
  penultimate 
  whorl, 
  attenuated 
  

   inferiorly 
  on 
  the 
  last, 
  and 
  not 
  quite 
  cut 
  across 
  by 
  the 
  transverse 
  

   sulci 
  ; 
  these 
  are 
  deepish, 
  not 
  quite 
  so 
  broad 
  as 
  the 
  interstices, 
  

   numbering 
  from 
  6 
  to 
  7 
  on 
  tho 
  penultimate 
  volution 
  and 
  about 
  16 
  

   on 
  the 
  last. 
  The 
  aperture 
  is 
  small, 
  occupying 
  less 
  tlian 
  half 
  the 
  

   length 
  of 
  the 
  shell. 
  The 
  columella 
  is 
  pale 
  pink, 
  covered 
  with 
  a 
  

   thin 
  callus 
  bearing 
  four 
  oblique 
  plaits. 
  The 
  outer 
  lip 
  is 
  thin, 
  and 
  

   armed 
  within 
  with 
  about 
  eight 
  thread-like 
  lirae. 
  Length 
  6 
  millim., 
  

   diam. 
  2^, 
  

  

  Providence 
  Eeef 
  and 
  Cerf 
  Island, 
  Mascareues, 
  in 
  10-24 
  fms. 
  

  

  This 
  is 
  a 
  very 
  small 
  species, 
  but 
  probably 
  adult, 
  as 
  the 
  more 
  

   crowded 
  character 
  of 
  the 
  costse 
  behind 
  the 
  labrum 
  indicates. 
  The 
  

   dirty 
  fleshy 
  zone 
  around 
  the 
  middle 
  of 
  the 
  body- 
  whorl 
  is 
  sometimes 
  

   slightly 
  visible 
  upon 
  the 
  spire 
  just 
  above 
  the 
  suture. 
  

  

  50. 
  Marginalia 
  picturata. 
  (Plate 
  XLIV. 
  fig. 
  P.) 
  

  

  MargineUa 
  ( 
  Glabella) 
  picturata, 
  G. 
  ^ 
  H. 
  Nevill, 
  Journ. 
  As. 
  Soc. 
  Bengal, 
  

   1874, 
  vol. 
  xliii. 
  pt. 
  1>, 
  p. 
  23, 
  vol. 
  xliv. 
  pi. 
  8. 
  f. 
  89; 
  copied 
  by 
  Wein- 
  

   kaitff, 
  Couch.-Cab. 
  pi. 
  22. 
  tigs. 
  13, 
  14. 
  

  

  Poivre 
  Island, 
  Amirantes, 
  in 
  20 
  fms. 
  ; 
  Mauritius 
  (Nevill). 
  

  

  A 
  very 
  pretty 
  specimen 
  from 
  Poivre 
  Island 
  is 
  somewhat 
  dif- 
  

   ferently 
  painted, 
  the 
  spots 
  upon 
  the 
  white 
  zones 
  being 
  curved 
  or 
  

   almost 
  arrowhead-shaped, 
  and 
  in 
  four 
  series 
  upon 
  the 
  body- 
  whorl 
  ; 
  

   two 
  of 
  these, 
  namely 
  one 
  a 
  little 
  below 
  the 
  suture 
  and 
  the 
  other 
  

   just 
  beneath 
  the 
  middle, 
  are 
  less 
  distinct 
  than 
  the 
  others, 
  which 
  

   fall 
  above 
  and 
  below 
  tho 
  lower 
  more 
  indistinct 
  one. 
  Tho 
  outer 
  lip 
  

   has 
  a 
  fourth 
  red 
  spot 
  at 
  the 
  upper 
  extremity, 
  and 
  the 
  anterior 
  end 
  

   of 
  the 
  columella 
  is 
  tinged 
  with 
  the 
  same 
  colour. 
  

  

  57. 
  Dolium 
  (Malea) 
  pomum, 
  Limif}. 
  

   Olorioso 
  Islands, 
  on 
  reefs, 
  dead. 
  

  

  2 
  k 
  2 
  

  

  