﻿172 
  

  

  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  It 
  will 
  be 
  seen, 
  then, 
  that 
  of 
  the 
  Echinids 
  19 
  were 
  found 
  south 
  of 
  

   the 
  tropical 
  line, 
  and 
  11, 
  or 
  57"5 
  per 
  cent., 
  were 
  not 
  found 
  either 
  

   by 
  the 
  'Alert' 
  or 
  'Australian 
  Museum' 
  collectors 
  within 
  the 
  tropics. 
  

   Of 
  the 
  Opliiurids 
  9 
  were 
  found 
  south 
  of 
  the 
  line, 
  and 
  only 
  one 
  also 
  

   within 
  it, 
  so 
  that 
  of 
  this 
  class 
  88'8 
  per 
  cent, 
  were 
  found 
  only 
  to 
  the 
  

   south 
  of 
  the 
  tropics. 
  

  

  When 
  we 
  turn 
  to 
  the 
  lists 
  of 
  the 
  ' 
  Alert 
  ' 
  collections 
  in 
  the 
  ' 
  Aus- 
  

   tralian 
  ' 
  seas 
  and 
  in 
  the 
  western 
  part 
  of 
  the 
  Indian 
  Ocean, 
  we 
  find 
  a 
  

   very 
  different 
  story. 
  

  

  Ech'mids. 
  — 
  Of 
  the 
  28 
  species 
  collected 
  within 
  the 
  tropical 
  seas 
  of 
  

   Australia, 
  four 
  only, 
  or 
  14-2 
  per 
  cent., 
  were 
  found 
  also 
  at 
  Port 
  

   Jackson, 
  while 
  no 
  less 
  than 
  23, 
  or 
  72 
  per 
  cent., 
  were 
  found 
  also 
  in 
  

   the 
  tropical 
  parts 
  of 
  the 
  western 
  Indian 
  Ocean. 
  

  

  Table 
  III. 
  — 
  List 
  of 
  Echinoidea 
  collected 
  by 
  the 
  ' 
  Alert 
  ' 
  (to 
  which 
  

   is 
  added 
  a 
  statement 
  of 
  such 
  as 
  are 
  found 
  also 
  north 
  of 
  the 
  

   equator, 
  but 
  within 
  the 
  tropics). 
  

  

  Cidaris 
  metularia 
  

  

  Phyllacauthus 
  annulifera 
  .. 
  

  

  baculosa 
  

  

  Diadema 
  setosum 
  

  

  Astropyga 
  radiata 
  

  

  Salmacis 
  alexandri 
  

  

  bicolor 
  

  

  sulcata 
  

  

  Temnopleurus 
  toreumaticus 
  

  

  granulosus 
  

  

  botliryoides 
  

  

  Echinus 
  angulosus 
  

  

  darnleyensis 
  

  

  Toxopncustes 
  pileolus 
  

  

  Tripneustes 
  angulosus 
  

  

  Stroiigylocentrotus 
  erythro- 
  

  

  grammus 
  

  

  Echinometra 
  lucunter 
  

  

  Fibularia 
  volva 
  

  

  Olypeaster 
  humilis 
  

  

  scutil'ormis 
  

  

  Laganum 
  depressum 
  

  

  decagonale 
  

  

  EchiuoneuB 
  cyclostomus 
  

  

  Maretia 
  planulata 
  

  

  Lovenia 
  elongata 
  

  

  Breynia 
  aust 
  ralasice 
  

  

  Echinocardium 
  australe 
  

  

  Brissus 
  uuicolor 
  

  

  Metalia 
  sternalis 
  

  

  ^ 
  (u 
  .-< 
  

  

  =^ 
  § 
  S 
  

  

  O 
  o 
  ^ 
  

   1-3 
  

  

  