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  broader 
  than 
  long. 
  Six 
  arm-spines, 
  the 
  uppermost 
  the 
  longest, 
  as 
  

   long 
  as 
  two 
  or 
  three 
  arm-plates, 
  swollen 
  at 
  their 
  tip, 
  only 
  faintly 
  

   thorny. 
  One 
  tentacle-scale. 
  

  

  Disk 
  with 
  a 
  large 
  number 
  of 
  blue 
  patches 
  and 
  dots 
  ; 
  arm-plates 
  

   above 
  faint 
  reddish 
  pink, 
  with 
  dots 
  of 
  blue 
  at 
  the 
  sides, 
  and 
  broad 
  

   transverse 
  bands 
  of 
  blue 
  at 
  regular 
  intervals. 
  Colour-markihgs 
  

   below 
  less 
  pronounced. 
  

  

  Port 
  Jackson, 
  0-5 
  fms. 
  

  

  14. 
  OpMothrix 
  caBspitosa. 
  

  

  Lyman^ 
  Chall, 
  Rep. 
  p. 
  218. 
  

  

  Though 
  the 
  ' 
  Challenger 
  ' 
  found 
  but 
  few 
  representatives 
  of 
  this 
  

   species, 
  it 
  is 
  apparently 
  one 
  of 
  the 
  most 
  common 
  in 
  the 
  neighbour- 
  

   hood 
  of 
  Sydney. 
  

  

  Port 
  Jackson, 
  March 
  1881. 
  

  

  15. 
  OpMothrix 
  martensi. 
  

   Lyman, 
  p. 
  36. 
  

  

  If 
  I 
  am 
  right 
  in 
  ascribing 
  to 
  this 
  species 
  examples 
  from 
  Thursday 
  

   Island 
  and 
  Port 
  Darwin, 
  it 
  is 
  one 
  which 
  must 
  be 
  regarded 
  as 
  exhi-* 
  

   biting 
  very 
  remarkable 
  variations 
  in 
  coloration. 
  The 
  original 
  spe- 
  

   cimens, 
  collected 
  by 
  Prof. 
  Semper 
  in 
  the 
  Philippines, 
  were 
  described 
  

   by 
  Mr. 
  Lyman 
  as 
  being 
  in 
  colour, 
  " 
  above, 
  bright 
  indigo, 
  with 
  a 
  

   darker 
  line 
  along 
  the 
  arm, 
  bounded 
  by 
  a 
  lighter 
  one 
  on 
  either 
  side 
  ; 
  

   below, 
  paler 
  indigo, 
  with 
  a 
  white 
  line 
  along 
  the 
  arm." 
  In 
  a 
  smaller 
  

   specimen, 
  " 
  the 
  blue 
  lines 
  along 
  the 
  arms 
  were 
  continued 
  to 
  the 
  

   centre 
  of 
  the 
  disk, 
  but 
  were 
  not 
  margined 
  by 
  lighter 
  liucs." 
  In 
  the 
  

   two 
  specimens 
  collected 
  on 
  "Aug. 
  7, 
  1874" 
  (in 
  the 
  neighbourhood 
  

   of 
  the 
  Fiji 
  Islands), 
  by 
  the 
  ' 
  Challenger,' 
  and 
  determined 
  by 
  Mr. 
  

   Lyman, 
  I 
  observe 
  that 
  there 
  is 
  a 
  faint 
  indication 
  of 
  a 
  white 
  line 
  on 
  

   either 
  side 
  of 
  the 
  blue 
  lines 
  on 
  the 
  disk, 
  and 
  that 
  the 
  white 
  line 
  

   on 
  the 
  ventral 
  surface 
  is, 
  at 
  places, 
  broken 
  across 
  by 
  a 
  patch 
  of 
  

   indigo. 
  

  

  On 
  either 
  side 
  of 
  these 
  " 
  typical 
  specimens 
  " 
  there 
  would 
  appear 
  

   to 
  be 
  a 
  light 
  and 
  a 
  dark 
  variety. 
  In 
  the 
  latter 
  the 
  whole 
  creature 
  

   may 
  be 
  deep 
  purple, 
  the 
  two 
  white 
  lines 
  on 
  the 
  arms 
  being 
  at 
  regu- 
  

   lar 
  distances 
  invaded 
  by 
  purple 
  patches 
  of 
  such 
  a 
  size 
  as 
  to 
  leave 
  only 
  

   spaces 
  of 
  white 
  equal 
  to 
  themselves 
  ; 
  and 
  as 
  these 
  patches 
  are 
  sym- 
  

   metrical 
  on 
  either 
  side 
  of 
  the 
  middle 
  line, 
  the 
  original 
  white 
  lines 
  

   come 
  to 
  be 
  represented 
  by 
  nothing 
  more 
  than 
  paired 
  patches 
  of 
  white 
  ; 
  

   similarly 
  the 
  white 
  line 
  below 
  disappears, 
  or 
  rather 
  is 
  forced 
  out 
  to 
  

   the 
  sides, 
  and 
  appears 
  only 
  as 
  a 
  thin 
  marginal 
  line. 
  The 
  light 
  

   variety 
  is 
  no 
  less 
  interesting 
  ; 
  with 
  the 
  exception 
  of 
  the 
  radiating 
  

   lines, 
  the 
  disk 
  above 
  is 
  altogether 
  white, 
  and 
  even 
  these 
  lines 
  may 
  

  

  