﻿92 
  COLLECTIONS 
  FROM 
  MELANESIA. 
  

  

  narrow 
  lamella, 
  which 
  on 
  each 
  side 
  becomes 
  rather 
  broader, 
  forming 
  

   a 
  small 
  lappet 
  of 
  supraoral 
  tentacles. 
  Rhiuophores 
  rather 
  lateral, 
  far 
  

   apart, 
  conical, 
  acute 
  at 
  the 
  tips, 
  cariuate 
  on 
  the 
  outside, 
  concentri- 
  

   cally 
  lamcllato-striated. 
  Length 
  27 
  millim. 
  

   Hah. 
  North 
  Australia, 
  Albany 
  Island, 
  4 
  fms. 
  

  

  13G. 
  Bornella 
  digitata. 
  

  

  Adams 
  ^- 
  Reeve, 
  l^oy. 
  ' 
  Samarang^ 
  p. 
  67, 
  pi. 
  19. 
  fig. 
  1 
  ; 
  Alder 
  8r 
  Han- 
  

   cock, 
  Trans. 
  Zool. 
  Soc. 
  vol. 
  v. 
  p. 
  140, 
  pi. 
  33. 
  figs. 
  8, 
  9 
  ; 
  Beryh 
  in 
  

   Semper 
  s 
  Eeisen 
  Arch. 
  Philijjpiiien, 
  vol. 
  ii. 
  p. 
  301, 
  pi. 
  37. 
  tigs. 
  14-19, 
  

   & 
  pi. 
  38. 
  ligs. 
  13-22. 
  

  

  Ifab. 
  Port 
  Denison, 
  Queensland, 
  4 
  fms. 
  {Coppinger). 
  

  

  I 
  have 
  three 
  specimens 
  before 
  me, 
  which 
  offer 
  certain 
  differences 
  

   in 
  the 
  number 
  of 
  lobes 
  on 
  the 
  branchial 
  papillte 
  and 
  even 
  in 
  the 
  

   number 
  of 
  the 
  papillte 
  themselves. 
  All 
  these 
  have 
  the 
  four 
  anterior 
  

   pairs 
  branchiferous, 
  and 
  in 
  each 
  case 
  the 
  two 
  foremost 
  pairs 
  have 
  

   two 
  branchial 
  tufts 
  at 
  the 
  inner 
  base 
  (in 
  contraction), 
  but 
  the 
  two 
  

   hindmost 
  pairs 
  exhibit 
  considerable 
  variation. 
  In 
  specimen 
  No. 
  1 
  

   both 
  pairs 
  are 
  provided 
  with 
  three 
  tufts, 
  of 
  which 
  the 
  central 
  one 
  is 
  

   very 
  small. 
  Specimen 
  2 
  has 
  three 
  tufts 
  adjoining 
  each 
  of 
  the 
  third 
  

   pair 
  and 
  two 
  to 
  each 
  of 
  the 
  fourth. 
  Example 
  3 
  has 
  three 
  tufts 
  at 
  

   the 
  base 
  of 
  the 
  left 
  papilla 
  of 
  third 
  pair, 
  and 
  two 
  at 
  the 
  base 
  of 
  the 
  

   opposite 
  one 
  of 
  the 
  same 
  pair 
  ; 
  of 
  the 
  fourth 
  pair 
  the 
  right 
  papilla 
  

   is 
  provided 
  with 
  three 
  plumes 
  or 
  tufts 
  and 
  the 
  left 
  with 
  two. 
  

  

  The 
  annexed 
  table 
  will 
  best 
  illustrate 
  the 
  variation 
  in 
  the 
  lobation 
  

   of 
  the 
  papilla 
  : 
  — 
  

  

  First 
  pair. 
  Second. 
  Third. 
  Fourth. 
  Fifth. 
  Sixth. 
  

  

  No. 
  1 
  3 
  lobes. 
  2 
  2 
  1 
  1* 
  1 
  

  

  „ 
  2 
  3 
  „ 
  3 
  2 
  2 
  1 
  1* 
  

  

  ,,3 
  3 
  „ 
  2 
  2 
  1 
  1 
  1* 
  

  

  The 
  number 
  of 
  the 
  frontal 
  lobes 
  is 
  also 
  very 
  variable. 
  In 
  speci- 
  

   men 
  No. 
  1 
  there 
  are 
  eighteen 
  in 
  both 
  groups, 
  in 
  No. 
  2 
  twelve 
  on 
  

   the 
  left 
  and 
  eleven 
  on 
  the 
  right, 
  and 
  in 
  No. 
  3 
  the 
  left 
  consists 
  of 
  

   sixteen 
  and 
  the 
  right 
  group 
  of 
  twelve. 
  

  

  Consideinng 
  these 
  variations, 
  it 
  appears 
  to 
  me 
  very 
  probable 
  that 
  

   B. 
  arhorescens 
  of 
  Pease 
  is 
  only 
  a 
  variety 
  of 
  this 
  species. 
  The 
  

   original 
  account 
  by 
  Pease 
  differs 
  considerably 
  from 
  that 
  given 
  by 
  

   Bergh. 
  The 
  number 
  of 
  lobes 
  on 
  the 
  six 
  pairs 
  of 
  papillre 
  according 
  

   to 
  these 
  authors 
  varies, 
  and 
  even 
  the 
  number 
  which 
  are 
  gill-bearing. 
  

  

  137. 
  Oncidium 
  (Peronia) 
  punctatum? 
  

  

  Onchidium 
  punctatum, 
  Quoy 
  i^ 
  Gaimard, 
  Voy. 
  de 
  V 
  Astrolabe, 
  Zoologie, 
  

   vol. 
  ii. 
  p. 
  215. 
  

  

  Hah. 
  Albany 
  Island 
  and 
  Thursday 
  Island, 
  N. 
  coast 
  of 
  Australia 
  

   (^Copping 
  er). 
  

  

  * 
  These 
  are 
  not 
  in 
  pairs, 
  but 
  consist 
  of 
  a 
  single 
  simple 
  papilla 
  on 
  the 
  central 
  

   dorsal 
  line. 
  

  

  