﻿508 
  Bibliographical 
  Notices. 
  

  

  7. 
  The 
  spinif 
  era-group 
  embraces 
  eleven 
  species 
  which 
  occur 
  in 
  

   the 
  Caribbean 
  Sea 
  and 
  Eastern 
  Archipelago, 
  predominating 
  in 
  the 
  

   former. 
  Their 
  bathymetrical 
  range 
  is 
  from 
  35 
  to 
  740 
  fathoms. 
  

  

  8. 
  The 
  palmata-group 
  contains 
  twenty-three 
  species, 
  which 
  are 
  

   limited 
  exclusively 
  to 
  the 
  Western 
  Pacific 
  and 
  Indian 
  Ocean, 
  ranging 
  

   northward 
  as 
  far 
  as 
  South 
  Japan, 
  but 
  not 
  extending 
  southward 
  

   beyond 
  the 
  tropic 
  of 
  Capricorn. 
  All 
  belong 
  to 
  the 
  littoral 
  fauna 
  

   excepting 
  one 
  species 
  dredged 
  between 
  210 
  and 
  610 
  fathoms. 
  

  

  9. 
  The 
  granulifera-group 
  includes 
  six 
  species 
  which 
  have 
  essen- 
  

   tially 
  the 
  same 
  distribution, 
  both 
  bathymetrical 
  and 
  geographical, 
  as 
  

   the 
  basicurva- 
  and 
  spinifera-groupa, 
  which 
  are 
  also 
  distinguished 
  by 
  

   wall-sided 
  rays 
  and 
  an 
  ambulacral 
  skeleton. 
  

  

  10. 
  The 
  Savir/nif 
  i-group 
  embraces 
  ten 
  species, 
  which 
  are 
  found 
  

   in 
  the 
  Western 
  Pacific 
  as 
  far 
  north 
  as 
  Hong 
  Kong 
  and 
  Japan, 
  the 
  

   Eastern 
  Archipelago, 
  and 
  the 
  Indian 
  Ocean 
  westward 
  to 
  the 
  lied 
  

   Sea. 
  All 
  belong 
  to 
  the 
  littoral 
  zone, 
  one 
  only 
  extending 
  to 
  140 
  

   fathoms 
  in 
  the 
  Arafura 
  Sea. 
  

  

  Actinometra 
  (Miiller), 
  as 
  amended 
  by 
  the 
  author, 
  contains 
  forty- 
  

   eight 
  recent 
  species, 
  which 
  are 
  divided 
  into 
  series 
  and 
  groups, 
  as 
  

   shown 
  in 
  the 
  following 
  table 
  : 
  — 
  

  

  I. 
  The 
  two 
  outer 
  radials 
  and 
  the 
  first 
  two 
  brachials 
  

  

  respectively 
  united 
  by 
  syzygy. 
  

  

  a. 
  Ten 
  arms 
  solaris-group. 
  

  

  b. 
  Two 
  distichals 
  united 
  by 
  syzygy 
  paucieirra-group. 
  

  

  c. 
  Three 
  distichals, 
  the 
  axillary 
  a 
  syzygy 
  typica-group. 
  

  

  II. 
  The 
  two 
  outer 
  radials 
  articulated. 
  Teu 
  arms 
  . 
  . 
  echinoptera-group. 
  

  

  III. 
  Two 
  articulated 
  distichals. 
  

  

  a. 
  The 
  first 
  two 
  brachials 
  uuited 
  by 
  syzygy 
  sfellif/cra-group. 
  

  

  b. 
  The 
  first 
  arm-syzygy 
  in 
  the 
  third 
  brachial 
  .... 
  valida-group. 
  

  

  IV. 
  Three 
  distichals, 
  the 
  first 
  two 
  articulated, 
  the 
  

  

  third 
  axillary 
  Avith 
  a 
  syzygy. 
  

  

  a. 
  First 
  arm-syzygy 
  in 
  the 
  second 
  brachial 
  Jimbriafa-group. 
  

  

  b. 
  First 
  arm-syzygy 
  in 
  the 
  third 
  brachial 
  parvicirra-group. 
  

  

  1. 
  The 
  solaris-group 
  contains 
  three 
  species 
  which 
  inhabit 
  the 
  

   Eastern 
  Archipelago, 
  but 
  extend 
  northward 
  to 
  the 
  China 
  Sea 
  and 
  

   southward 
  to 
  the 
  coast 
  of 
  Queensland 
  as 
  far 
  as 
  latitude 
  24° 
  S. 
  They 
  

   are 
  limited 
  to 
  shallow 
  water, 
  12 
  fathoms 
  or 
  less. 
  

  

  2. 
  The 
  paucicirra-group 
  includes 
  only 
  two 
  species, 
  one 
  of 
  which 
  

   was 
  obtained 
  at 
  Mergui 
  and 
  the 
  other 
  is 
  abundant 
  at 
  Torres 
  Strait. 
  

   They 
  are 
  shallow-water 
  forms. 
  

  

  3. 
  The 
  typica-group 
  contains 
  four 
  species 
  which 
  are 
  all 
  confined 
  

   to 
  the 
  Eastern 
  Archipelago 
  and 
  Western 
  Pacific. 
  Three 
  are 
  purely 
  

   littoral 
  species, 
  but 
  the 
  fourth 
  has 
  been 
  dredged 
  near 
  Fiji 
  from 
  a 
  

   depth 
  of 
  over 
  200 
  fathoms. 
  

  

  4. 
  The 
  echinoptera-group 
  includes 
  six 
  species, 
  five 
  of 
  which 
  are 
  

   members 
  of 
  the 
  Caribbean 
  fauna, 
  with 
  extension 
  to 
  the 
  coast 
  of 
  

  

  