﻿CETTSTACEA. 
  271 
  

  

  anterior 
  margins 
  ; 
  in 
  the 
  first 
  two 
  pairs 
  there 
  is 
  also 
  a 
  small 
  spinule 
  

   at 
  the 
  distal 
  end 
  of 
  the 
  posterior 
  mai'gin. 
  Ground-colour 
  yellowish 
  ; 
  

   the 
  transverse 
  imbrications 
  of 
  the 
  carapace 
  and 
  legs 
  are 
  red 
  ; 
  the 
  

   carpus- 
  and 
  merus-joints 
  of 
  the 
  ambulatory 
  legs 
  are 
  also 
  banded 
  with 
  

   red. 
  Length 
  and 
  breadth 
  of 
  the 
  carapace 
  of 
  the 
  largest 
  specimen 
  

   (a 
  female 
  with 
  ova) 
  a 
  little 
  over 
  4 
  lines 
  (9 
  millim.), 
  of 
  chelipede, 
  

   when 
  extended, 
  9^ 
  lines 
  (20 
  millim.). 
  

  

  Two 
  adult 
  females 
  and 
  three 
  males 
  (one 
  very 
  small) 
  are 
  in 
  the 
  

   first 
  collection 
  from 
  Port 
  Denisou, 
  4 
  fms. 
  (Nos. 
  Ill, 
  122), 
  and 
  a 
  

   small 
  male 
  from 
  Port 
  MoUe, 
  5-12 
  fms. 
  (No. 
  118) 
  ; 
  in 
  the 
  second 
  

   collection 
  is 
  an 
  adult 
  female 
  from 
  Prince 
  of 
  Wales 
  Channel, 
  7 
  fms. 
  

   (No. 
  169), 
  and 
  two 
  small 
  specimens 
  from 
  Thursday 
  Island, 
  4-5 
  fms, 
  

   (No. 
  165). 
  

  

  The 
  description 
  is 
  taken 
  from 
  the 
  largest 
  female 
  ; 
  in 
  the 
  smallest 
  

   specimen 
  the 
  anterior 
  margin 
  of 
  the 
  front 
  is 
  minutely 
  denticulated. 
  

  

  There 
  are 
  in 
  the 
  British-Museum 
  collection 
  three 
  specimens 
  ob- 
  

   tained 
  off 
  Cape 
  Capricorn 
  (15 
  fms.). 
  White's 
  typical 
  specimen 
  is 
  

   from 
  the 
  Philippine 
  Islands, 
  Corregidor 
  (Cuming). 
  

  

  In 
  the 
  last 
  consignment 
  received 
  from 
  H.M.S. 
  ' 
  Alert 
  ' 
  are 
  speci- 
  

   mens 
  from 
  the 
  Seychelles. 
  

  

  This 
  species 
  cannot, 
  I 
  think, 
  be 
  confounded 
  with 
  any 
  of 
  the 
  

   numerous 
  Oriental 
  forms 
  described 
  by 
  Milne-Edwards, 
  Dana, 
  Stimp- 
  

   son, 
  and 
  Heller. 
  

  

  It 
  is 
  evidently 
  nearly 
  allied 
  to 
  P. 
  scabrkula, 
  Dana*, 
  from 
  the 
  

   Sooloo 
  Sea, 
  and 
  to 
  P. 
  ']nilitaris, 
  Heller 
  f, 
  from 
  the 
  Nicobars, 
  in 
  both 
  

   of 
  which 
  the 
  spinulation 
  of 
  the 
  carapace 
  is 
  different 
  and 
  the 
  palms 
  

   of 
  the 
  chelipcdes 
  externally 
  pubescent. 
  In 
  P. 
  scabricula 
  the 
  series 
  

   of 
  spines 
  along 
  the 
  posterior 
  margin 
  of 
  the 
  wrist 
  seem 
  to 
  extend 
  

   along 
  its 
  whole 
  length 
  ; 
  and 
  HeUer 
  makes 
  no 
  mention 
  of 
  the 
  pro- 
  

   minent 
  spine 
  on 
  the 
  upper 
  margin 
  of 
  the 
  orbit 
  in 
  his 
  description 
  of 
  

   P. 
  militaris, 
  which 
  in 
  P. 
  annulijjes 
  seems 
  to 
  occupy 
  the 
  position 
  of 
  

   the 
  obtuse-lateral 
  frontal 
  lobes 
  mentioned 
  in 
  his 
  description. 
  

  

  Mr. 
  Haswell 
  (Catalogue, 
  p. 
  146) 
  refers 
  certain 
  specimens 
  collected 
  

   at 
  Port 
  Denison 
  to 
  the 
  Petrolisthes 
  dentatus 
  of 
  M.-Edwards 
  J 
  ; 
  but 
  as 
  

   he 
  only 
  cites 
  M,-Edwards's 
  very 
  short 
  diagnosis 
  and 
  adds 
  nothing 
  

   respecting 
  the 
  Australian 
  specimens, 
  I 
  am 
  unable 
  to 
  say 
  whether 
  

   they 
  are 
  distinguishable 
  from 
  the 
  species 
  I 
  have 
  designated 
  P. 
  has- 
  

   welli 
  or 
  from 
  P. 
  annulipcs. 
  M.-Edwards's 
  types 
  were 
  from 
  Java, 
  and 
  

   seem 
  to 
  be 
  distinguished 
  from 
  the 
  Australian 
  species 
  by 
  having 
  the 
  

   posterior 
  margin 
  of 
  the 
  carpus 
  of 
  the 
  chelipedes 
  " 
  dentele 
  en 
  scie." 
  

  

  15. 
  Petrolisthes 
  ? 
  corallicola 
  (Haswell)? 
  (Plate 
  XXIX. 
  fig. 
  C.) 
  

  

  ? 
  Porcellana 
  corallicola, 
  Ilastvell, 
  Proc. 
  Linn. 
  Soc. 
  N. 
  S, 
  Wales, 
  vi. 
  

   p. 
  759 
  (1881) 
  ; 
  Cat. 
  Austr. 
  Crust, 
  p. 
  150 
  (1882). 
  

  

  Carapace 
  much 
  longer 
  than 
  broad, 
  the 
  gastric 
  and 
  hepatic 
  regions 
  

  

  * 
  U.S. 
  Expl. 
  Exp. 
  xiii. 
  Crust, 
  i. 
  p. 
  424, 
  pi, 
  xxvi. 
  fig. 
  13 
  (1852). 
  

   t 
  Crust, 
  in 
  Reise 
  der 
  Novara, 
  p. 
  75 
  (18(55). 
  

   X 
  Hist. 
  Nat. 
  Crust, 
  ii. 
  p. 
  251 
  (1837). 
  

  

  