﻿ECHINODEKMATA. 
  167 
  

  

  A 
  specimen 
  "with 
  an 
  arm 
  120 
  millim. 
  long 
  has 
  the 
  cirri 
  15-5 
  

   millim. 
  lone:, 
  the 
  first 
  pinnule 
  20 
  millim. 
  long, 
  and 
  the 
  arms 
  3 
  millim. 
  

   at 
  their 
  widest 
  ; 
  in 
  other 
  words, 
  these 
  measurements 
  are 
  very 
  much 
  

   the 
  same 
  as 
  those 
  of 
  the 
  specimens 
  of 
  A. 
  Solaris 
  lately 
  referred 
  to. 
  

   The 
  faint 
  white 
  line 
  which 
  is 
  so 
  often 
  seen 
  along 
  the 
  middle 
  of 
  the 
  

   dorsal 
  surface 
  of 
  the 
  arms 
  is 
  to 
  he 
  seen 
  in 
  some 
  specimens 
  ; 
  and 
  in 
  

   some 
  cases 
  we 
  may 
  observe 
  the 
  black 
  spots 
  on 
  the 
  pinnules, 
  to 
  

   which 
  attention 
  has 
  already 
  been 
  directed. 
  

  

  It 
  will 
  be 
  clear 
  enough 
  to 
  the 
  student 
  that 
  the 
  specimens 
  now 
  under 
  

   discussion 
  present 
  several 
  points 
  of 
  considerable 
  difficulty 
  ; 
  but, 
  thoi;gh 
  

   they 
  have 
  the 
  general 
  facies 
  of 
  ^. 
  Solaris 
  and 
  on 
  the 
  other 
  hand 
  a 
  

   larger 
  number 
  of 
  cirri 
  and 
  a 
  feebler 
  keel, 
  thereby 
  approaching 
  

   A. 
  robusta, 
  thej% 
  at 
  the 
  same 
  time, 
  present 
  sufficient 
  constancy 
  in 
  

   the 
  retention 
  of 
  their 
  differential 
  characters 
  to 
  prevent 
  our 
  believing 
  

   that 
  the 
  differences 
  that 
  we 
  observe 
  have 
  not 
  passed 
  Avithin 
  the 
  in- 
  

   fluence 
  of 
  the 
  laws 
  of 
  heredity. 
  

  

  Albany 
  Island. 
  

  

  18. 
  Actinometra 
  robusta. 
  

  

  Actinometra 
  robusta 
  (Zilfken, 
  MSS.), 
  P. 
  H. 
  Carpente?-, 
  Journ. 
  Linn. 
  

   Soc, 
  Zool. 
  xvi. 
  p. 
  517. 
  

  

  In 
  specimens 
  of 
  this 
  comparatively 
  well-marked 
  form 
  from 
  " 
  St. 
  

   144," 
  * 
  which 
  were 
  somewhat 
  smaller 
  than 
  those 
  described 
  by 
  

   Mr. 
  Carpenter, 
  I 
  noted 
  that 
  the 
  basal 
  joints 
  of 
  the 
  arm 
  were 
  not 
  so 
  

   distinctly 
  knobbed, 
  and 
  that 
  there 
  was 
  a 
  faint 
  carination 
  to 
  the 
  basal 
  

   joints 
  of 
  the 
  second 
  pinnule. 
  On 
  the 
  other 
  hand, 
  in 
  a 
  larger 
  speci- 
  

   men 
  from 
  Port 
  Curtis, 
  which 
  appeared 
  to 
  be 
  particularly 
  well 
  deve- 
  

   loped, 
  the 
  knobs 
  were 
  very 
  prominent. 
  

  

  "With 
  regard 
  to 
  the 
  specimens 
  from 
  St. 
  144, 
  Dr. 
  Coppinger 
  notes 
  

   that 
  they 
  were 
  " 
  originally 
  of 
  a 
  purple 
  colour." 
  

  

  19. 
  Actinometra 
  strota. 
  

  

  Among 
  the 
  present 
  collection 
  of 
  Crinoids 
  Mr. 
  Carpenter 
  recog- 
  

   nized 
  a 
  single 
  specimen 
  of 
  a 
  species 
  which 
  he 
  has 
  distinguished 
  as 
  

   A. 
  stroia, 
  n. 
  sp., 
  and 
  of 
  which 
  he 
  will 
  give 
  a 
  full 
  account 
  in 
  his 
  

   forthcoming 
  Report 
  on 
  the 
  Comatulce 
  of 
  the 
  'Challenger' 
  Ex- 
  

   pedition. 
  

  

  Port 
  MoUe. 
  

  

  20. 
  Actinometra 
  cumingii. 
  

  

  Comatula 
  cumingii, 
  /. 
  Miiller, 
  p. 
  19. 
  

  

  A 
  delicate 
  specimen 
  with 
  10 
  cirri, 
  the 
  cirri 
  having 
  about 
  12 
  

   joints 
  and 
  no 
  penultimate 
  spine, 
  and 
  most 
  of 
  the 
  joints 
  being 
  a 
  

  

  * 
  Probably 
  Thursday 
  Jsland. 
  

  

  