﻿490 
  COLLECTIONS 
  FROM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN. 
  

  

  glossy, 
  convex, 
  non-peri)endicular 
  with 
  the 
  axis 
  of 
  the 
  shell 
  ; 
  the 
  

   rest 
  granosely 
  finely 
  costate 
  and 
  transversely 
  lirate, 
  slightly 
  convex 
  

   at 
  the 
  sides, 
  Costae 
  about 
  eighteen 
  in 
  number 
  on 
  a 
  whorl, 
  hardly 
  

   as 
  broad 
  as 
  the 
  interstices. 
  Line 
  finer 
  than 
  the 
  ribs, 
  six 
  on 
  the 
  

   upper 
  whorls 
  and 
  about 
  twenty 
  on 
  the 
  last. 
  Aperture 
  small, 
  nar- 
  

   row, 
  terminating 
  anteriorly 
  in 
  a 
  short, 
  oblique, 
  recurved 
  canal. 
  

   Columella 
  covered 
  with 
  a 
  callus 
  bearing 
  two 
  small 
  tubercles 
  just 
  

   below 
  the 
  middle. 
  Labrum 
  externally 
  thickened 
  with 
  a 
  broadish 
  

   varix, 
  faintly 
  siiiuated 
  above 
  near 
  the 
  suture, 
  armed 
  within 
  with 
  

   seven 
  strongish 
  lirse. 
  Length 
  5 
  millim., 
  diam. 
  1| 
  ; 
  aperture 
  1| 
  long, 
  

   ^ 
  broad. 
  

  

  Etoile 
  Island, 
  Amirantes, 
  in 
  13 
  fms. 
  

  

  There 
  is 
  a 
  little 
  group 
  of 
  species 
  with 
  which 
  that 
  now 
  described 
  

   should 
  be 
  placed, 
  and 
  which 
  does 
  not 
  quite 
  come 
  under 
  any 
  one 
  of 
  

   the 
  as 
  yet 
  named 
  subgenera 
  of 
  Pleurotoma. 
  They 
  are 
  small 
  shells 
  

   with 
  cancellated 
  sculpture, 
  having 
  smooth 
  apical 
  whorls, 
  an 
  in- 
  

   distinct 
  labral 
  sinus, 
  and 
  lirae 
  or 
  denticles 
  within 
  the 
  outer 
  lip. 
  

   Columbella 
  monilifera, 
  Sowb. 
  (^ 
  = 
  Pleurot. 
  fHSColineata, 
  C. 
  B. 
  Adams, 
  

   = 
  P. 
  sealpta, 
  Eeeve), 
  P. 
  pygmcea, 
  C. 
  B. 
  Ad., 
  P. 
  maculata, 
  C. 
  B. 
  Ad., 
  

   P. 
  minor, 
  C. 
  B. 
  Ad., 
  P. 
  piperata, 
  Smith, 
  and 
  P. 
  trifilosa, 
  Smith, 
  all 
  

   belong 
  to 
  this 
  section. 
  

  

  The 
  present 
  species 
  is 
  remarkable 
  on 
  account 
  of 
  the 
  proportionally 
  

   large 
  size 
  of 
  the 
  smooth 
  nucleus, 
  consisting 
  of 
  four 
  and 
  a 
  half 
  

   volutions. 
  

  

  13. 
  Terehra 
  habylonica, 
  Lamarck. 
  

   Marie-Louise 
  Island, 
  Amirantes, 
  20 
  fms. 
  

  

  14. 
  Terelbra 
  cerithina. 
  

  

  {Lamarck) 
  Kiener, 
  Coq. 
  Viv. 
  pi. 
  11. 
  fig. 
  25 
  ; 
  So^oerhy, 
  T/iesatirns, 
  vol. 
  i. 
  

  

  pi. 
  43. 
  fig. 
  68 
  ; 
  Reeve, 
  Conch. 
  Icon. 
  vol. 
  xii. 
  figs. 
  38 
  a, 
  h. 
  

   Var. 
  ? 
  = 
  Terebra 
  eburnea, 
  Hinds, 
  Thesaurus, 
  vol. 
  i. 
  pi. 
  45. 
  fig. 
  123. 
  

   Juv. 
  = 
  Terebra 
  pulcbra, 
  Hinds, 
  I. 
  c. 
  fig. 
  129 
  ; 
  Reeve, 
  I. 
  c 
  sp. 
  155. 
  

  

  Providence 
  Reef, 
  Mascarenes, 
  24 
  fms. 
  

  

  In 
  the 
  Museum 
  there 
  are 
  specimens 
  from 
  the 
  Seychelles 
  and 
  

   Philippine 
  Islands, 
  N.E. 
  Australia, 
  Timor, 
  Marquesas 
  and 
  Society 
  

   Islands. 
  

  

  15. 
  Terebra 
  dimidiata, 
  juv. 
  

   Cerf 
  Island, 
  Mascarenes, 
  10 
  fms. 
  

  

  16. 
  Terebra 
  bruguieri. 
  

   Deshayes, 
  Proc. 
  Zool. 
  Soc. 
  1859, 
  p. 
  297 
  ; 
  Reeve, 
  Conch, 
  Icon. 
  vol. 
  xii. 
  

  

  Terebra 
  hindsii, 
  Deshayes, 
  Journ. 
  de 
  Conch, 
  vol. 
  vi. 
  pi. 
  5. 
  fig. 
  5. 
  

  

  He 
  des 
  Roches, 
  Amirantes, 
  13 
  fms. 
  

  

  Other 
  localities 
  for 
  this 
  species 
  are 
  China 
  (Deshayes) 
  and 
  Sey- 
  

   chelle 
  Islands 
  {E. 
  P. 
  Wright, 
  in 
  Brit. 
  Mus.). 
  

  

  