﻿Bibliographical 
  Notices. 
  507 
  

  

  III. 
  Two 
  articulated 
  distichals; 
  multibracbiate. 
  

  

  a. 
  Bidistichate 
  species 
  with 
  the 
  radial 
  axillaries 
  

  

  and 
  some 
  of 
  the 
  following 
  joints 
  more 
  or 
  less 
  

   wall-sided 
  and 
  a 
  well-marked 
  ambulacra!, 
  

   skeleton 
  on 
  the 
  pinnules 
  spinifera-growp. 
  

  

  b. 
  Bidistichate 
  species 
  with 
  an 
  unplated 
  disk 
  and 
  

  

  no 
  definite 
  ambulacral 
  skeleton. 
  Sides 
  of 
  

   brachials 
  scarcely 
  if 
  at 
  all 
  flattened. 
  First 
  

   pinnule 
  smaller 
  than 
  its 
  successors 
  jialmata-grouip. 
  

  

  IV. 
  Three 
  distichals, 
  the 
  first 
  two 
  articulated 
  and 
  

   the 
  third 
  axillary 
  with 
  a 
  syzygy. 
  

  

  a. 
  Tridistichate 
  species 
  with 
  plated 
  ambulacra 
  and 
  

  

  the 
  lower 
  part 
  of 
  rays 
  flattened 
  laterally 
  .... 
  granulifera-gcovca. 
  

  

  b. 
  Tridistichate 
  species 
  with 
  unplated 
  disk 
  and 
  no 
  

  

  definite 
  ambulacral 
  skeleton 
  ; 
  bases 
  of 
  rays 
  not 
  

  

  flattened 
  laterally 
  Saviffnyi-group. 
  

  

  1. 
  The 
  elegans-grou]) 
  comprises 
  three 
  species 
  and 
  their 
  distribu- 
  

   tion 
  is 
  limited 
  to 
  shallow 
  water 
  in 
  the 
  Eastern 
  Archipelago. 
  

  

  2. 
  The 
  basicurva-grou]) 
  embraces 
  twenty- 
  two 
  species, 
  all 
  of 
  

   which, 
  with 
  the 
  exception 
  of 
  one 
  from 
  the 
  Southern 
  Sea 
  and 
  four 
  

   from 
  the 
  Atlantic, 
  inhabit 
  the 
  western 
  Pacific 
  and 
  Australasia 
  ; 
  and 
  

   all 
  belong 
  to 
  the 
  continental 
  or 
  abyssal 
  zone, 
  ranging 
  from 
  140 
  to 
  

   1600 
  fathoms, 
  excepting 
  one 
  species 
  from 
  49 
  fathoms 
  in 
  the 
  Arafura 
  

   Sea. 
  

  

  3. 
  Of 
  the 
  acoela-gvowp 
  only 
  two 
  species 
  are 
  known, 
  one 
  from 
  140 
  

   fathoms 
  in 
  the 
  Arafura 
  Sea 
  and 
  the 
  other 
  from 
  500 
  fathoms 
  off 
  the 
  

   Meangis 
  Islands. 
  

  

  4. 
  The 
  Eschricliti-growp 
  contains 
  seven 
  species, 
  three 
  of 
  which 
  are 
  

   arctic 
  and 
  four 
  antarctic. 
  The 
  arctic 
  species 
  extend 
  between 
  the 
  

   parallels 
  of 
  43° 
  N. 
  in 
  the 
  Atlantic 
  and 
  81° 
  N. 
  in 
  Smith's 
  Sound. 
  

   Two 
  of 
  the 
  antarctic 
  species 
  occur 
  in 
  the 
  Strait 
  of 
  Magellan 
  and 
  the 
  

   other 
  two 
  between 
  Kerguelen 
  and 
  Heard 
  Island. 
  Only 
  two 
  of 
  the 
  

   species 
  are 
  found 
  at 
  depths 
  greater 
  than 
  200 
  fathoms, 
  one 
  extending 
  

   to 
  466 
  and 
  the 
  other 
  to 
  632 
  fathoms. 
  

  

  5. 
  The 
  tenella-grouj) 
  comprises 
  twenty-three 
  species, 
  most 
  of 
  

   which 
  inhabit 
  the 
  Atlantic 
  and 
  circumpolar 
  seas, 
  one 
  extending 
  to 
  

   the 
  parallel 
  of 
  81° 
  N. 
  Five 
  species 
  only 
  occur 
  in 
  the 
  Pacific, 
  four 
  

   of 
  them 
  ranging 
  between 
  150 
  and 
  775 
  fathoms, 
  whilst 
  the 
  fifth 
  

   (from 
  the 
  Worth 
  Pacific) 
  was 
  from 
  a 
  depth 
  of 
  2900 
  fathoms. 
  The 
  

   same 
  species 
  was 
  also 
  obtained 
  in 
  the 
  Southern 
  Ocean 
  at 
  2600 
  

   fathoms. 
  (These 
  were 
  the 
  two 
  deepest 
  stations 
  at 
  which 
  Comatula) 
  

   were 
  met 
  with.) 
  Two 
  other 
  species 
  were 
  also 
  obtained 
  in 
  the 
  

   Southern 
  Ocean 
  at 
  1600 
  fathoms. 
  

  

  6. 
  The 
  Milberti-growp 
  contains 
  fourteen 
  species, 
  all 
  of 
  which 
  are 
  

   limited 
  to 
  the 
  Pacific 
  and 
  the 
  Eastern 
  Archipelago, 
  with 
  the 
  exception 
  

   of 
  one 
  which 
  extends 
  into 
  the 
  Indian 
  Ocean, 
  Ked 
  Sea, 
  and 
  Western 
  

   Atlantic. 
  This 
  was 
  dredged 
  off 
  St. 
  Lucia 
  in 
  278 
  fathoms, 
  but 
  all 
  

   the 
  other 
  members 
  of 
  the 
  group 
  are 
  confined 
  to 
  the 
  littoral 
  zone 
  

   most 
  of 
  them 
  inhabiting 
  depths 
  not 
  exceeding 
  20 
  fathoms. 
  

  

  