﻿492 
  COLLECTIONS 
  FEOM 
  THE 
  WESTEEN 
  INDIAN 
  OCEAN. 
  

  

  The 
  costa3 
  are 
  seven 
  in 
  number 
  on 
  the 
  last 
  volution, 
  and 
  eight 
  or 
  

   nine 
  on 
  the 
  upper 
  ones. 
  There 
  are 
  two 
  principal 
  transverse 
  ridges 
  

   on 
  the 
  latter, 
  with 
  a 
  smaller 
  one 
  between 
  them, 
  the 
  uppermost 
  

   being 
  situated 
  at 
  the 
  angle 
  about 
  the 
  middle 
  of 
  the 
  whorls, 
  and 
  the 
  

   lowermost 
  at 
  the 
  suture 
  below. 
  The 
  body-whorl 
  has 
  three 
  stout 
  

   ridges 
  round 
  the 
  middle 
  part, 
  and 
  two 
  rather 
  more 
  slender 
  ones 
  

   below, 
  in 
  addition 
  to 
  the 
  raised 
  squamous 
  ridge 
  around 
  the 
  cauda 
  or 
  

   extremity. 
  On 
  crossing 
  the 
  costae 
  these 
  ridges 
  are 
  considerably 
  

   produced 
  into 
  prickly 
  hollow 
  scales, 
  and 
  are 
  everywhere 
  crossed 
  by 
  

   very 
  fine 
  elevated 
  lines 
  of 
  growth. 
  The 
  aperture 
  is 
  lilac, 
  not 
  greatly 
  

   contracted 
  anteriorly, 
  and, 
  together 
  with 
  the 
  canal, 
  occupies 
  about 
  

   half 
  the 
  entire 
  length 
  of 
  the 
  shell. 
  The 
  outer 
  lip 
  is 
  armed 
  within 
  

   with 
  about 
  six 
  short 
  lirje 
  ; 
  and 
  the 
  columella 
  exhibits 
  a 
  tiibercle 
  

   at 
  the 
  upper 
  part 
  and 
  one 
  or 
  two 
  below 
  the 
  middle. 
  The 
  canal 
  is 
  

   short, 
  open, 
  and 
  recurved. 
  Length 
  8 
  millim., 
  greatest 
  width 
  4^. 
  

   Etoile 
  Island, 
  Amirantes, 
  in 
  13 
  fms., 
  coral. 
  

  

  21. 
  Murex 
  (Ocinebra) 
  darrosensis. 
  (Plate 
  XLIV. 
  fig. 
  F.) 
  

  

  Shell 
  small, 
  fusiformly 
  ovate, 
  white, 
  spotted 
  upon 
  and 
  between 
  the 
  

   ribs 
  with 
  pale 
  and 
  dark 
  brown. 
  Whorls 
  7, 
  the 
  apical 
  smooth, 
  

   convex 
  ; 
  the 
  rest 
  subconcavely 
  sloping 
  above, 
  angulated 
  near 
  the 
  

   middle, 
  straightish 
  at 
  the 
  sides, 
  longitudinally 
  costate 
  and 
  spirally 
  

   ridged. 
  Costa) 
  moderately 
  strong, 
  about 
  nine 
  on 
  a 
  whorl, 
  produced 
  

   into 
  angular 
  prominences 
  where 
  crossed 
  by 
  the 
  chief 
  transverse 
  

   lirte 
  ; 
  the 
  latter 
  are 
  three 
  in 
  number 
  on 
  the 
  upper 
  volutions, 
  all 
  

   on 
  their 
  lower 
  half, 
  and 
  five 
  or 
  six 
  on 
  the 
  last. 
  In 
  addition 
  to 
  

   these, 
  the 
  surface 
  is 
  ornamented 
  with 
  several 
  finer 
  intervening 
  lira? 
  

   and 
  very 
  fine 
  lines 
  of 
  growth. 
  The 
  aperture 
  is 
  rather 
  open, 
  ovate, 
  

   contracted 
  into 
  a 
  short, 
  open, 
  oblique, 
  recurved 
  canal, 
  and 
  somewhat 
  

   stained 
  with 
  yellow. 
  The 
  labrum 
  has 
  a 
  broad 
  varix 
  exteriorly, 
  and 
  

   about 
  eight 
  fine 
  lirse 
  within. 
  The 
  columella 
  is 
  arcuate 
  above, 
  

   yellowish, 
  and 
  bears 
  a 
  small 
  tubercle 
  or 
  two 
  below 
  the 
  middle. 
  

   Length 
  11 
  millim., 
  greatest 
  width 
  6. 
  

  

  Darros 
  Island, 
  Amirantes, 
  22 
  fms. 
  ; 
  broken-coral 
  bottom. 
  

  

  This 
  species 
  closely 
  resembles 
  M. 
  tiitens, 
  A. 
  Adams, 
  but 
  is 
  

   smaller, 
  has 
  the 
  upper 
  part 
  of 
  the 
  whorls 
  more 
  concave, 
  and 
  more 
  

   numerous 
  longitudinal 
  costae. 
  

  

  22, 
  Pisania 
  ignea, 
  Gmclin. 
  

   Barros 
  Island, 
  Amirantes. 
  

  

  23. 
  Pisania 
  (Tritonidea) 
  uiidosa, 
  Linne. 
  

   Darros 
  Island, 
  Amirantes. 
  

  

  24. 
  Columbella 
  turturina, 
  Laniard: 
  

   African 
  and 
  Eagle 
  Islands, 
  Amirantes, 
  10-12 
  fms. 
  

  

  