﻿498 
  COLLECTIOKS 
  FROM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN. 
  

  

  47. 
  Harpa 
  minor, 
  Lamarcl-. 
  

   Darros 
  Island, 
  on 
  the 
  shore, 
  

  

  48. 
  Mitra 
  episcopalis, 
  Linne. 
  

   Mozambique. 
  

  

  49. 
  Mitra 
  coronata, 
  Chemnitz. 
  

   Darros 
  Island, 
  in 
  22 
  fms. 
  

  

  50. 
  Mitra 
  luctuosa. 
  

  

  A. 
  Adams 
  ; 
  So^cerby, 
  Thesaurus 
  Conch, 
  vol. 
  iv. 
  Cg. 
  229. 
  

  

  Darros 
  Island, 
  in 
  22 
  fms. 
  

  

  This 
  species 
  is 
  of 
  a 
  dark 
  olive-brown 
  colour, 
  having 
  a 
  single 
  

   yellow 
  line 
  around 
  the 
  upper 
  part 
  of 
  the 
  whorls. 
  It 
  is 
  spirally 
  

   punctate-striate 
  throughout, 
  consists 
  of 
  ten 
  whorls, 
  and 
  has 
  five 
  

   plaits 
  on 
  the 
  columella, 
  of 
  which 
  the 
  lowermost 
  is 
  insignificant. 
  

  

  51 
  . 
  Mitra 
  tenuis. 
  (Plate 
  XLIV. 
  fig. 
  K.) 
  

   Sowerby, 
  Thesaurus., 
  vol. 
  iv. 
  p. 
  6, 
  fig. 
  327. 
  

  

  Seychelles, 
  in 
  4-12 
  fms. 
  

  

  The 
  locality 
  of 
  this 
  species 
  has 
  hitherto 
  been 
  unrecorded. 
  It 
  is 
  a 
  

   thin, 
  narrow 
  shell, 
  of 
  a 
  light 
  yellowish-brown 
  colour, 
  having 
  a 
  pale 
  

   zone 
  at 
  the 
  upper 
  part 
  of 
  the 
  whorls, 
  another 
  around 
  the 
  middle 
  of 
  

   the 
  last, 
  and 
  a 
  third 
  less 
  distinct 
  one 
  towards 
  the 
  base. 
  Whorls 
  10 
  ; 
  

   five 
  apical 
  escentric, 
  smooth, 
  convex, 
  pale, 
  the 
  rest 
  normal, 
  almost 
  

   flat 
  at 
  the 
  sides, 
  separated 
  by 
  an 
  oblique 
  suture, 
  sculj)tured 
  through- 
  

   out 
  with 
  spiral 
  striae 
  and 
  lines 
  of 
  growth. 
  The 
  aperture 
  is 
  very 
  

   much 
  narrowed 
  above 
  and 
  widens 
  considerably 
  below. 
  The 
  colu- 
  

   mella 
  is 
  oblique 
  and 
  armed 
  with 
  four 
  plaits. 
  Length 
  12imillim., 
  

   diameter 
  3^, 
  aperture 
  5^ 
  long. 
  

  

  Sowerby's 
  figure 
  of 
  the 
  type, 
  now 
  in 
  the 
  British 
  Museum, 
  is 
  con- 
  

   siderably 
  enlarged, 
  and 
  represents 
  the 
  aperture 
  a 
  little 
  too 
  long 
  in 
  

   proportion 
  to 
  the 
  spire, 
  and 
  only 
  two 
  plaits 
  on 
  the 
  columella 
  are 
  

   indicated, 
  whilst 
  no 
  mention 
  whatever 
  is 
  made 
  of 
  this 
  character 
  in 
  

   the 
  text. 
  The 
  " 
  light 
  fulvous 
  band 
  " 
  is 
  not 
  at 
  the 
  upper 
  part 
  of 
  

   the 
  whorls 
  as 
  stated, 
  this 
  portion 
  being 
  pale 
  and 
  the 
  baud 
  falling- 
  

   lower 
  down. 
  

  

  52. 
  Turricnla 
  (Callithea) 
  exasperata, 
  Chemnitz. 
  

   Seychelles, 
  4-12 
  fms. 
  

  

  53. 
  Turricula 
  (Callithea) 
  mucronata. 
  

  

  ]\Jitra 
  mucronata, 
  Swainson; 
  Reeve, 
  Conch. 
  Icon. 
  fig. 
  125; 
  Sowerby, 
  

  

  Thes. 
  Conch, 
  tig. 
  379. 
  

   Mitra 
  echinata, 
  A. 
  Adams, 
  Proc. 
  Zool. 
  Soc. 
  1850, 
  p. 
  138. 
  

  

  Cerf 
  Island, 
  Mascarenes, 
  in 
  10 
  fms. 
  

  

  