﻿ECHINODEEMATA. 
  147 
  

  

  Hololhurians 
  it 
  is 
  especially 
  necessary 
  to 
  remember 
  the 
  words 
  of 
  

   Fabricius, 
  " 
  Tn 
  spiritii 
  viiii 
  mire 
  dcformatiir, 
  ita 
  ut 
  non 
  pro 
  eadem 
  

   habeatur 
  '**. 
  The 
  remarkable 
  spicules 
  arc, 
  however, 
  an 
  exact 
  copy 
  

   of 
  those 
  figured 
  by 
  Semper 
  ; 
  and 
  there 
  seems 
  to 
  be 
  no 
  good 
  reason 
  for 
  

   erecting 
  on 
  it 
  a 
  new 
  species. 
  

   Port 
  Jackson, 
  0-5 
  fms. 
  

  

  3. 
  Cucumaria 
  semperi. 
  (Plate 
  IX. 
  fig. 
  A.) 
  

  

  Body 
  elongated, 
  5-sided 
  ; 
  suckers 
  regularly 
  arranged 
  in 
  two 
  rows, 
  

   except 
  at 
  the 
  two 
  ends 
  of 
  the 
  body 
  ; 
  the 
  suckers 
  darker 
  than 
  the 
  

   other 
  parts, 
  being 
  almost 
  black 
  ; 
  the 
  rest 
  of 
  the 
  body 
  of 
  a 
  mulatto 
  

   tint 
  (in 
  spirit), 
  or 
  slate-grey, 
  or 
  whitish. 
  Body 
  widest 
  in 
  the 
  middle. 
  

   Length 
  36, 
  25 
  millim. 
  ; 
  greatest 
  breadth 
  10, 
  8"5 
  millim. 
  

  

  Ketractors 
  inserted 
  at 
  a 
  little 
  more 
  than 
  one 
  third 
  of 
  the 
  whole 
  

   length 
  from 
  the 
  anterior 
  end 
  ; 
  Polian 
  vesicle 
  large 
  ; 
  calcareous 
  ring- 
  

   long, 
  and 
  composed 
  of 
  a 
  number 
  of 
  pieces, 
  as 
  in 
  G. 
  conjimgens 
  or 
  

   C. 
  citrea. 
  Genital 
  tubes 
  delicate, 
  about 
  6 
  millim. 
  long, 
  attached 
  to 
  

   the 
  mesentery 
  at 
  about 
  the 
  middle 
  of 
  the 
  body. 
  

  

  The 
  supporting-rods 
  in 
  the 
  suckers 
  are 
  not 
  unlike 
  folding 
  eye- 
  

   glasses 
  in 
  form, 
  and 
  are 
  somewhat 
  similar 
  to 
  those 
  of 
  Ocniis 
  pygmcvus 
  ; 
  

   the 
  plates 
  in 
  the 
  integument 
  are 
  spherical, 
  the 
  framework 
  very 
  deli- 
  

   cate 
  and 
  consisting, 
  as 
  seen 
  in 
  a 
  surface 
  view, 
  of 
  a 
  central 
  bar 
  con- 
  

   nected 
  at 
  cither 
  end 
  with 
  the 
  peripheral 
  encircling 
  piece 
  by 
  two 
  

   bars 
  making 
  an 
  acute 
  angle 
  with 
  one 
  another. 
  They 
  are 
  present 
  

   in 
  great 
  numbers. 
  

  

  Port 
  Denison 
  ; 
  Torres 
  Straits. 
  

  

  4. 
  Ocnus, 
  sp. 
  

  

  A 
  single 
  specimen 
  of 
  what 
  is 
  apparently 
  an 
  undescribed 
  speciea 
  

   is 
  in 
  the 
  collection 
  ; 
  but 
  its 
  form 
  is 
  so 
  characteristic 
  that 
  I 
  have 
  not 
  

   thought 
  it 
  right 
  to 
  injure 
  it 
  in 
  any 
  way. 
  It 
  is 
  distinguished 
  exter- 
  

   nally 
  by 
  the 
  soft 
  interspaces 
  in 
  the 
  integument, 
  the 
  greyish-white 
  

   colour, 
  and 
  the 
  elongated 
  narrow 
  form 
  of 
  the 
  body. 
  

  

  Port 
  Darwin, 
  12 
  fms. 
  

  

  5. 
  ColocMrus 
  tuberculosus. 
  (Plate 
  IX. 
  fig. 
  B.) 
  

   Colochirus 
  anceps, 
  Semper, 
  Hoi. 
  pp. 
  57, 
  239, 
  iblqiie 
  citata. 
  

  

  There 
  is 
  a 
  very 
  large 
  series 
  of 
  this 
  species, 
  and 
  the 
  specimens 
  

   differ 
  very 
  considerably 
  among 
  themselves, 
  not 
  only 
  in 
  appearance 
  

   but 
  in 
  the 
  extent 
  to 
  which 
  the 
  colouring-matter 
  has 
  been 
  dissolved 
  

   out 
  ; 
  only 
  one 
  retains 
  any 
  indication 
  of 
  the 
  red 
  pigment. 
  The 
  

   variations 
  exhibited 
  by 
  the 
  specimens 
  as 
  they 
  have 
  come 
  to 
  the 
  

   Museum 
  (some 
  being 
  quite 
  white, 
  others 
  slate- 
  grey, 
  and 
  others 
  

  

  * 
  Fauna 
  Groenl, 
  p. 
  354. 
  

  

  i2 
  

  

  