﻿Bibliographical 
  Notices. 
  509 
  

  

  Brazil 
  and 
  the 
  Bahamas 
  (one 
  even 
  passing 
  to 
  the 
  East 
  Atlantic), 
  

   and 
  the 
  sixth 
  from 
  Malacca 
  and 
  the 
  coast 
  of 
  Queensland. 
  The 
  

   bathymetrical 
  range 
  is 
  from 
  shallow 
  water 
  to 
  probably 
  S30 
  fathoms. 
  

  

  5. 
  The 
  stettigera-gTOup 
  contains 
  four 
  species, 
  one 
  of 
  which 
  is 
  

   found 
  on 
  both 
  sides 
  of 
  the 
  Atlantic 
  and 
  possibly 
  also 
  in 
  the 
  Eastern 
  

   Archipelago 
  ; 
  but 
  all 
  the 
  other 
  members 
  of 
  the 
  group 
  are 
  limited 
  to 
  

   the 
  latter 
  region 
  and 
  the 
  Western 
  Pacific. 
  The 
  bathymetrical 
  

   range 
  is 
  from 
  shallow 
  water 
  to 
  probably 
  830 
  fathoms. 
  

  

  6. 
  The 
  valida-gvowp 
  comprises 
  four 
  species, 
  all 
  of 
  which 
  are 
  con- 
  

   fined 
  exclusively 
  to 
  the 
  Eastern 
  Archipelago, 
  including 
  the 
  Fiji 
  and 
  

   the 
  Friendly 
  Islands. 
  All 
  are 
  shallow-water 
  forms. 
  

  

  7. 
  The 
  fimbriata-growp 
  includes 
  seven 
  species, 
  two 
  of 
  which 
  

   inhabit 
  the 
  Caribbean 
  Sea, 
  while 
  the 
  remainder 
  of 
  the 
  forms 
  are 
  

   limited 
  to 
  the 
  Indian 
  Ocean, 
  the 
  Eastern 
  Archipelago, 
  and 
  the 
  

   North-west 
  Pacific. 
  Of 
  the 
  Atlantic 
  species 
  one 
  possibly 
  ranges 
  

   down 
  to 
  88 
  fathoms, 
  while 
  the 
  other 
  occurs 
  between 
  this 
  depth 
  and 
  

   118 
  fathoms. 
  The 
  eastern 
  species 
  all 
  belong 
  to 
  the 
  purely 
  littoral 
  

   fauna. 
  

  

  8. 
  The 
  parvicirra-growp 
  contains 
  twenty 
  species 
  and 
  is 
  more 
  

   widely 
  distributed 
  than 
  any 
  other 
  in 
  the 
  genus 
  Actinometm. 
  It 
  is 
  

   represented 
  on 
  the 
  Peruvian 
  coast 
  and 
  at 
  Tahiti, 
  is 
  abundant 
  at 
  

   Samoa, 
  Tonga, 
  and 
  Fiji, 
  and 
  extends 
  through 
  the 
  Eastern 
  Archi- 
  

   pelago 
  to 
  Japan 
  on 
  the 
  north 
  and 
  the 
  Nicobar 
  Islands 
  on 
  the 
  west. 
  

   It 
  also 
  occurs 
  at 
  Natal 
  and 
  Simon's 
  Bay, 
  and 
  is 
  represented 
  by 
  one 
  

   species 
  on 
  the 
  southern 
  coast 
  of 
  Australia. 
  The 
  bathymetrical 
  

   range 
  is 
  from 
  shallow 
  water 
  to 
  210 
  or 
  255 
  fathoms. 
  

  

  Promachocrinus, 
  Carpenter, 
  is 
  characterized 
  by 
  the 
  presence 
  of 
  

   ten 
  radials 
  in 
  the 
  calyx 
  instead 
  of 
  the 
  usual 
  five. 
  In 
  all 
  other 
  

   respects 
  there 
  is 
  no 
  essential 
  difference 
  between 
  this 
  genus 
  and 
  

   Antedon. 
  It 
  is 
  represented 
  by 
  three 
  species, 
  one 
  of 
  which 
  was 
  ob- 
  

   tained 
  at 
  a 
  depth 
  of 
  500 
  fathoms 
  off 
  the 
  Meangis 
  Islands 
  and 
  the 
  

   other 
  two 
  from 
  localities 
  in 
  the 
  Southern 
  Ocean, 
  one 
  from 
  shallow 
  

   water 
  down 
  to 
  75 
  fathoms 
  off 
  Kerguelen 
  and 
  Heard 
  Island 
  and 
  

   the 
  other 
  from 
  between 
  Marion 
  Island 
  and 
  Kerguelen 
  at 
  1600 
  

   fathoms 
  and 
  from 
  south 
  of 
  Australia 
  at 
  1800 
  fathoms, 
  where 
  it 
  was 
  

   associated 
  with 
  the 
  remarkable 
  genus 
  Thaumatocrinus. 
  

  

  Thiolliericrinus, 
  Etallon, 
  is 
  only 
  known 
  in 
  a 
  fossil 
  state, 
  and 
  has 
  

   hitherto 
  been 
  found 
  in 
  Jurassic 
  and 
  Lower 
  Cretaceous 
  beds. 
  

  

  Geologically 
  the 
  history 
  of 
  the 
  Comatulae, 
  so 
  far 
  as 
  our 
  present 
  

   knowledge 
  goes, 
  dates 
  from 
  the 
  Middle 
  Lias, 
  where 
  the 
  family 
  is 
  

   represented 
  by 
  the 
  genus 
  Aatedon. 
  The 
  earliest 
  known 
  Actino- 
  

   metra 
  is 
  from 
  the 
  Bathonian 
  ; 
  and 
  Eudiocrinus 
  has 
  been 
  found 
  in 
  

   the 
  Lower 
  Neocomian 
  (Valangian). 
  

  

  The 
  following 
  summary 
  of 
  the 
  distribution 
  of 
  the 
  species 
  of 
  Ante- 
  

   don 
  and 
  Actinometm 
  respectively 
  presents 
  a 
  number 
  of 
  interesting 
  

   facts. 
  

  

  The 
  ten-armed 
  species 
  of 
  Antedon 
  have 
  a 
  wider 
  range 
  both 
  in 
  

   depth 
  and 
  in 
  space 
  than 
  any 
  other 
  types 
  of 
  the 
  genus. 
  They 
  arc 
  

   the 
  only 
  species 
  which 
  occur 
  outside 
  the 
  fortieth 
  parallels 
  of 
  latitude 
  

   and 
  at 
  greater 
  depths 
  than 
  750 
  fathoms. 
  

  

  Ann. 
  & 
  Mag. 
  N. 
  Hist. 
  Scr. 
  6. 
  Vol. 
  iii. 
  35 
  

  

  