﻿162 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  Syzygies 
  3 
  : 
  10 
  : 
  19, 
  or 
  3 
  : 
  11 
  : 
  21, 
  or 
  3 
  : 
  13 
  : 
  21, 
  or 
  3 
  : 
  14 
  : 
  21, 
  or 
  

   3 
  : 
  15 
  : 
  22 
  ; 
  then 
  from. 
  6-10 
  joints 
  between 
  each. 
  

  

  First 
  pinnules 
  very 
  short 
  ; 
  tliird 
  and 
  fourth 
  the 
  stoutest 
  and 
  

   longest, 
  quite 
  stiff, 
  with 
  well-developed 
  broad 
  lower 
  joints, 
  each 
  of 
  

   which 
  has 
  a 
  marked 
  protuberance 
  on 
  either 
  side 
  ; 
  the 
  succeeding 
  

   ones 
  shorter, 
  and 
  then 
  again 
  longer. 
  

  

  Arms 
  about 
  85 
  millim. 
  long, 
  the 
  longest 
  cirri 
  24 
  millim. 
  ; 
  dia- 
  

   meter 
  of 
  disk 
  6 
  millim. 
  

  

  Colour 
  : 
  pale 
  flesh, 
  occasionally 
  with 
  a 
  dark 
  band 
  here 
  and 
  there, 
  

   especially 
  at 
  the 
  syzygies 
  ; 
  sometimes 
  there 
  is 
  a 
  good 
  deal 
  of 
  brown. 
  

   The 
  cirri 
  are 
  typically 
  banded 
  purple 
  and 
  white. 
  

  

  Prince 
  of 
  Wales 
  Channel 
  ; 
  Torres 
  Straits. 
  

  

  This 
  species 
  has 
  some 
  resemblance 
  to 
  A. 
  decipiens 
  ; 
  but 
  it 
  may 
  be 
  

   distinguished 
  from 
  it 
  by 
  (a) 
  the 
  absence 
  of 
  spines 
  from 
  the 
  joints 
  of 
  

   the 
  cirri, 
  (/3) 
  the 
  broader 
  lower 
  pinnules, 
  and 
  (y) 
  the 
  greater 
  length 
  

   of 
  the 
  more 
  distal 
  pinnules. 
  

  

  13. 
  Antedon 
  elegans. 
  (Plate 
  XIII. 
  fig. 
  B, 
  a.) 
  

  

  Centrodorsal 
  small 
  and 
  flattened 
  ; 
  cirri 
  marginal, 
  in 
  two 
  rows, 
  

   25-30, 
  with 
  40 
  joints, 
  the 
  fifth 
  to 
  tenth 
  rather 
  longer 
  than 
  broad 
  ; 
  

   the 
  succeeding 
  ones 
  with 
  a 
  short 
  conical 
  spine, 
  which 
  diminishes 
  in 
  

   the 
  more 
  distal 
  ones, 
  but 
  enlarges 
  again 
  somewhat 
  as 
  a 
  penultimate 
  

   spine. 
  

  

  First 
  radials 
  just 
  visible 
  ; 
  second 
  wide, 
  barely 
  in 
  contact 
  ; 
  the 
  

   third 
  comparatively 
  short. 
  Thirty 
  arms. 
  The 
  three 
  distichals 
  

   pretty 
  long 
  ; 
  the 
  axillary 
  a 
  syzygy. 
  If 
  the 
  arms 
  divide 
  again 
  there 
  

   are 
  generally 
  two 
  joints, 
  when 
  the 
  axillary 
  is 
  not 
  a 
  syzygy 
  ; 
  but 
  

   there 
  may 
  be 
  three 
  joints, 
  and 
  then 
  the 
  axillary 
  is 
  a 
  syzyg)'. 
  

   The 
  earlier 
  brachials 
  have 
  even 
  sides 
  ; 
  they 
  then 
  become 
  wedge- 
  

   shaped, 
  but 
  do 
  not 
  overlap. 
  StiU. 
  further 
  out, 
  they 
  become 
  shorter 
  

   and 
  project 
  a 
  little 
  at 
  the 
  sides 
  ; 
  towards 
  the 
  free 
  end 
  of 
  the 
  arm 
  

   the 
  upper 
  face 
  of 
  each 
  joint 
  is 
  sharply 
  convex. 
  

  

  Syzygies 
  3 
  : 
  11 
  : 
  22 
  ; 
  then 
  9-13 
  joints 
  between 
  each. 
  

  

  The 
  first 
  two 
  pinnules 
  are 
  stift' 
  and 
  long, 
  longer 
  and 
  stouter 
  than 
  

   the 
  third 
  and 
  fourth 
  ; 
  none 
  of 
  the 
  following 
  are 
  long, 
  but 
  the 
  rather 
  

   more 
  distal 
  are 
  the 
  longer. 
  

  

  The 
  disk 
  is 
  deeply 
  incised, 
  and 
  the 
  margins 
  of 
  the 
  rays 
  provided 
  

   with 
  a 
  well-developed 
  and 
  characteristic 
  calcareous 
  plating. 
  

  

  Arms 
  delicate, 
  95 
  millim. 
  long, 
  cirri 
  30 
  millim. 
  ; 
  disk 
  (owing 
  to 
  

   the 
  incisions) 
  only 
  8 
  millim. 
  in 
  diameter. 
  

  

  Arms 
  pinkish 
  flesh-colour 
  above, 
  much 
  darker 
  below 
  ; 
  the 
  cirri 
  

   ringed 
  purplish 
  and 
  white. 
  In 
  a 
  younger 
  specimen 
  there 
  are 
  

   purplish 
  spots 
  on 
  the 
  arms* 
  above. 
  

  

  Port 
  MoUe. 
  

  

  A 
  disk 
  from 
  Thursday 
  Island 
  probably 
  belongs 
  to 
  this 
  species. 
  

  

  