﻿300 
  COLLECTIONS 
  FEOM 
  MELANESIA. 
  

  

  is 
  somewhat 
  elongated, 
  trigonous, 
  and 
  has 
  a 
  small 
  spinule 
  at 
  its 
  

   distal 
  end 
  ; 
  the 
  rami 
  arc 
  subequal 
  and 
  longer 
  than 
  the 
  base, 
  yet 
  not 
  

   greatly 
  elongated 
  as 
  in 
  some 
  species. 
  The 
  colour 
  (in 
  spirit) 
  is 
  yel- 
  

   lowish, 
  usually 
  closely 
  and 
  somewhat 
  irregularly 
  punctulated 
  with 
  

   black. 
  Length 
  of 
  the 
  largest 
  example 
  about 
  8 
  lines 
  (17 
  millim.) 
  ; 
  

   breadth 
  nearly 
  3^ 
  lines 
  (7 
  millim.). 
  

  

  These 
  specimens 
  very 
  nearly 
  resemble 
  examples 
  referred 
  to 
  L.gau- 
  

   dichaudii 
  from 
  Madjica-Sima 
  in 
  the 
  Museum 
  collection 
  ; 
  but 
  the 
  

   body 
  is 
  less 
  distinctly 
  granulated, 
  and 
  the 
  granulations 
  do 
  not 
  gene- 
  

   rally 
  extend 
  over 
  the 
  median 
  dorsal 
  line 
  of 
  the 
  postabdominal 
  seg- 
  

   ments, 
  and 
  the 
  notches 
  of 
  the 
  terminal 
  segment 
  are 
  not 
  distinctly 
  

   toothed. 
  In 
  one 
  specimen, 
  however, 
  I 
  have 
  observed 
  a 
  continuous 
  

   line 
  of 
  granules 
  bordering 
  the 
  posterior 
  margins 
  of 
  the 
  postabdominal 
  

   segments. 
  

  

  In 
  the 
  uncertainty 
  that 
  exists 
  regarding 
  the 
  true 
  nomenclature 
  of 
  

   not 
  a 
  few 
  species 
  of 
  this 
  genus, 
  I 
  prefer 
  to 
  retain 
  the 
  name 
  of 
  aus- 
  

   traliensis 
  as 
  a 
  designation 
  for 
  this 
  variety. 
  Mr. 
  Thomson* 
  has 
  de- 
  

   scribed 
  a 
  species 
  from 
  Dunedin, 
  New 
  Zealand 
  (L. 
  quadrata), 
  which 
  is 
  

   evidently 
  nearly 
  allied 
  to 
  the 
  L. 
  australiensis, 
  but 
  may, 
  perhaps, 
  be 
  

   distinguished 
  by 
  the 
  less 
  prominent 
  postero-lateral 
  angles 
  of 
  the 
  last 
  

   J 
  ostabdominal 
  segment, 
  which 
  is 
  described 
  as 
  " 
  subquadrate, 
  with 
  

   the 
  angles 
  hardly 
  projecting." 
  

  

  2. 
  Ceratothoa 
  imbricata. 
  

  

  Oniscus 
  imbricatus, 
  Fahr. 
  Mantissa 
  Insect, 
  i. 
  p. 
  241 
  (1787). 
  

  

  Cymothoa 
  imbricata, 
  Fabr. 
  Ent. 
  Syst. 
  ii. 
  p. 
  503 
  (1793) 
  ; 
  Suppl. 
  p. 
  304 
  

   (1798). 
  

  

  Cymothoa 
  banksii, 
  Leach, 
  Diet. 
  Sci. 
  Nat. 
  xii. 
  p. 
  353 
  (1818) 
  ; 
  Des- 
  

   marest, 
  Cunsid. 
  Crust, 
  p. 
  309 
  (1825) 
  ; 
  M.-Fdwards, 
  Hist. 
  Nat. 
  

   Crust, 
  iii. 
  p. 
  273 
  (1840) 
  ; 
  Heller, 
  Feise 
  der 
  Nuvara, 
  Crust, 
  p. 
  148 
  

   (1865). 
  

  

  Cymothoa 
  trigonocephala, 
  M.-Edwards 
  (nee 
  Leach 
  ?), 
  Ann. 
  Sci. 
  Nat. 
  

   ser. 
  2, 
  iii. 
  pi. 
  xiv. 
  tigs. 
  1, 
  2 
  (1835) 
  ; 
  Crust, 
  in 
  Cuv. 
  Fegne 
  Animal, 
  

   pi 
  Ixv. 
  fig. 
  2 
  ; 
  Hist. 
  Nat. 
  Crust, 
  iii. 
  p. 
  272 
  (1840), 
  var.; 
  Ouerin, 
  

   Icon. 
  Crust. 
  Fegne 
  Animal, 
  pi. 
  xxix. 
  fig. 
  2 
  {after 
  Milne-Edwards 
  ). 
  

  

  Ceratothoa 
  trigonocephala, 
  Heller, 
  Nuvara 
  Crust, 
  p. 
  148 
  (1865) 
  ; 
  

   Thomso7i, 
  Trans. 
  Neio-Zeal. 
  Inst. 
  xi. 
  p. 
  233 
  (1879), 
  var. 
  ; 
  Hastvell, 
  

   Cat. 
  Austr. 
  Crust, 
  p. 
  282 
  (1882), 
  after 
  M.-Edwards. 
  

  

  ? 
  Cymothoa 
  approximans, 
  White, 
  t. 
  c. 
  p. 
  110 
  (1847). 
  

   Ceratothoa 
  bauksii, 
  Miers, 
  Cat. 
  Neio-Zeal. 
  Crust, 
  p. 
  135 
  (1876). 
  

  

  A 
  small 
  specimen, 
  presenting 
  no 
  distinctive 
  external 
  sexual 
  cha- 
  

   racters, 
  is 
  in 
  the 
  collection 
  from 
  Port 
  Jackson, 
  0-5 
  fms. 
  It 
  is 
  un- 
  

   doubtedly 
  identical 
  with 
  a 
  somewhat 
  larger 
  specimen 
  from 
  the 
  same 
  

   locality 
  in 
  the 
  British-Museum 
  collection, 
  taken 
  " 
  from 
  the 
  mouth 
  of 
  a 
  

   bream." 
  The 
  type 
  example 
  of 
  C. 
  hanlcsii 
  (thus 
  designated 
  in 
  the 
  hand- 
  

   writing 
  of 
  Dr. 
  Leach) 
  is 
  of 
  larger 
  size, 
  and 
  is 
  said 
  to 
  have 
  been 
  obtained 
  

   in 
  the 
  New-Zealand 
  seas 
  ; 
  it 
  presents 
  no 
  distinctions 
  which 
  can 
  be 
  

   regarded 
  as 
  of 
  specific 
  importance, 
  and 
  the 
  description 
  which 
  I 
  have 
  

  

  * 
  Trans. 
  New-Zeal. 
  Inst. 
  xi. 
  p. 
  232 
  (1879). 
  

  

  