﻿134 
  COLLECTIONS 
  FROM 
  MELANESIA, 
  

  

  ing 
  notes 
  will 
  add 
  a 
  little 
  to 
  our 
  knowledge 
  of 
  this 
  form. 
  Not 
  one 
  

   of 
  the 
  three 
  specimens 
  collected 
  by 
  Dr. 
  Coppinger 
  (there 
  were 
  two 
  

   in 
  the 
  'Challenger' 
  collection) 
  distinctly 
  presents 
  that 
  cruciform 
  

   arrangement 
  of 
  fibres 
  in 
  the 
  dorsal 
  areae 
  which 
  was 
  so 
  striking 
  in 
  the 
  

   specimens 
  seen 
  by 
  Mr. 
  81aden 
  ; 
  in 
  some 
  of 
  the 
  areae 
  it 
  is 
  indistinctly 
  

   marked, 
  and 
  in 
  not 
  rare 
  cases 
  the 
  arose 
  are 
  divided 
  into 
  two 
  ; 
  the 
  

   number 
  of 
  pores 
  hardly 
  exceeds 
  fifty 
  ; 
  the 
  arose 
  may 
  be 
  square 
  as 
  

   well 
  as 
  rhomboidal, 
  or 
  may 
  be 
  triangular 
  or 
  have 
  the 
  angles 
  rounded. 
  

   There 
  is 
  not 
  that 
  diflcrence 
  in 
  hue 
  between 
  the 
  tissue 
  covering 
  the 
  

   areoe 
  and 
  that 
  covering 
  the 
  spinclets 
  which 
  Mr. 
  Sladen 
  observed 
  ; 
  

   but 
  there 
  may 
  be 
  great 
  differences 
  in 
  colour, 
  specimens 
  being 
  ashy 
  

   grey 
  or 
  deep 
  brown. 
  The 
  minor 
  radial 
  axis 
  is 
  respectively 
  60, 
  

   48-U, 
  and 
  44-7 
  millim. 
  

  

  Port 
  MoUe, 
  and 
  Thursday 
  Island 
  (4 
  fms., 
  coral). 
  

  

  OPHIUROIDEA. 
  

  

  1. 
  Pectinura 
  gorgonia. 
  

   Lyman, 
  Prel. 
  List, 
  p. 
  S*. 
  

  

  This 
  is 
  one 
  of 
  the 
  species 
  that 
  extends 
  as 
  far 
  west 
  as 
  Mauritius, 
  

   in 
  a 
  dried 
  specimen 
  from 
  which 
  island 
  all 
  the 
  transverse 
  bands 
  on 
  the 
  

   arms 
  have 
  disappeared, 
  and 
  the 
  number 
  of 
  arm-spines 
  is 
  as 
  many 
  as 
  

   twelve. 
  

  

  Port 
  Jackson, 
  0-5 
  fms. 
  

  

  2. 
  Pectinura 
  infernalis. 
  (Plate 
  Till. 
  fig. 
  B.) 
  

  

  Ophiaraclina 
  infernalis, 
  J/. 
  Tr. 
  p. 
  105. 
  

  

  Pectinura 
  infernalis, 
  Lyman, 
  Lull. 
  31. 
  C. 
  Z. 
  iii. 
  p. 
  222 
  ; 
  and 
  Prel. 
  

   List, 
  p. 
  3. 
  

  

  The 
  three 
  naked 
  plates 
  between 
  the 
  radial 
  shields, 
  which 
  are 
  so 
  

   markedly 
  referred 
  to 
  in 
  the 
  original 
  description, 
  and 
  are 
  so 
  well 
  

   seen 
  in 
  Mr. 
  Lyman's 
  figure, 
  are 
  not 
  always 
  so 
  distinctly 
  developed, 
  

   as 
  may 
  be 
  seen 
  by 
  the 
  figure 
  which 
  is 
  now 
  given. 
  

  

  Port 
  Molle 
  ; 
  Thursday 
  Island 
  ; 
  Prince 
  of 
  Wales 
  Channel 
  ; 
  a 
  young 
  

   specimen 
  fi'om 
  Port 
  Darwin. 
  

  

  3. 
  Pectinura 
  megaloplax. 
  

  

  Very 
  large 
  naked 
  radial 
  shields 
  ; 
  disk 
  elsewhere 
  covered 
  with 
  a 
  

   coarse 
  granulation, 
  beneath 
  which 
  are 
  largish 
  j:)lates, 
  somewhat 
  

   puffed 
  ; 
  the 
  arras 
  wide 
  at 
  their 
  insertion, 
  slightly 
  carinated. 
  Large 
  

   accessory 
  mouth-shields 
  present 
  in 
  all 
  the 
  interradii 
  ; 
  pores 
  between 
  

   first 
  and 
  second 
  ventral 
  arm-plates 
  only 
  ; 
  about 
  seven 
  rather 
  delicate 
  

   lateral 
  arm-spines 
  ; 
  upper 
  arm-plates 
  not 
  broken. 
  

  

  * 
  The 
  bibliographical 
  referenops 
  are 
  here 
  chiefly 
  confined 
  to 
  Mr. 
  Lyman's 
  

   Preliminary 
  List 
  ' 
  (Cambridge, 
  U. 
  S. 
  A., 
  1880). 
  

  

  