﻿CRUSTACEA. 
  275 
  

  

  curved 
  at, 
  tips, 
  and 
  having 
  betvreen 
  them 
  a 
  small 
  hiatus 
  when 
  

   closed 
  ; 
  the 
  upper 
  or 
  mobile 
  finger 
  is 
  strongly 
  arcuated, 
  sometimes 
  

   with 
  a 
  strong 
  blunt 
  tooth 
  at 
  base 
  ; 
  the 
  lower 
  has 
  its 
  inner 
  margin 
  

   obscurely 
  crenulated 
  and 
  sometimes 
  toothed. 
  The 
  first 
  three 
  pairs 
  

   of 
  ambulatory 
  legs 
  are 
  robust, 
  the 
  joints 
  nearly 
  naked 
  and 
  without 
  

   denticles 
  or 
  spinules, 
  except 
  on 
  the 
  inferior 
  margins 
  of 
  the 
  penulti- 
  

   mate 
  joints, 
  which 
  have 
  two 
  or 
  three 
  spinules 
  at 
  or 
  near 
  the 
  distal 
  

   extremity 
  ; 
  the 
  dactyli 
  are 
  short, 
  robust, 
  and 
  appear 
  biunguiculate 
  

   on 
  account 
  of 
  the 
  considerable 
  development 
  of 
  the 
  accessory 
  spine 
  on 
  

   the 
  inferior 
  margin, 
  behind 
  which 
  is 
  another 
  small 
  denticle. 
  The 
  

   ground-colour 
  (in 
  spirit) 
  is 
  yellowish 
  ; 
  the 
  carapace 
  and 
  chelipedes 
  

   are 
  blotched 
  with 
  pink 
  or 
  marked 
  with 
  irregular 
  lines 
  of 
  the 
  same 
  

   colour. 
  Length 
  of 
  carapace 
  of 
  an 
  adult 
  male 
  about 
  4 
  lines 
  (8^ 
  

   millim.), 
  breadth 
  about 
  ;3| 
  lines 
  (8 
  millim.) 
  ; 
  length 
  of 
  chelipede~, 
  

   when 
  fully 
  extended, 
  about 
  8| 
  lines 
  (20 
  millim.). 
  

  

  Port 
  Denison, 
  4 
  fms. 
  (No. 
  122) 
  : 
  a 
  considerable 
  number 
  of 
  spe- 
  

   cimens 
  were 
  obtained. 
  Specimens 
  were 
  also 
  received 
  with 
  the 
  

   second 
  collection 
  from 
  Friday 
  Island, 
  10 
  fms. 
  (No. 
  153), 
  Dundas 
  

   Straits, 
  17 
  fms. 
  (No. 
  161), 
  Port 
  Darwin, 
  12 
  fms., 
  and 
  others 
  dredged 
  

   in 
  the 
  Arafura 
  Sea 
  at 
  82-36 
  fms. 
  (No. 
  160). 
  

  

  The 
  description, 
  except 
  as 
  regards 
  coloration, 
  is 
  taken 
  from 
  an 
  

   adult 
  male 
  ; 
  the 
  coloration 
  is 
  ])erfectly 
  preserved 
  in 
  one 
  specimen 
  

   only, 
  a 
  female 
  with 
  ova. 
  The 
  larger 
  specimens 
  possessing 
  both 
  

   chelipedes 
  are 
  mostly 
  of 
  the 
  female 
  sex. 
  In 
  the 
  females 
  and 
  

   smaller-sized 
  specimens 
  the 
  lateral 
  lobes 
  of 
  the 
  front 
  arc 
  often 
  more 
  

   acute, 
  the 
  palms 
  of 
  the 
  chelipedes 
  relatively 
  shorter, 
  the 
  fingers 
  

   meet 
  along 
  their 
  inner 
  edges 
  when 
  closed, 
  and 
  the 
  upper 
  finger 
  has 
  

   not 
  the 
  strong 
  tooth 
  at 
  base, 
  etc. 
  

  

  In 
  the 
  robust 
  and 
  biunguiculate 
  dactyli 
  of 
  the 
  ambulatory 
  legs 
  

   this 
  form 
  resembles 
  the 
  species 
  of 
  Folyonyx, 
  but 
  differs 
  in 
  the 
  rela- 
  

   tively 
  longer 
  carapace, 
  which 
  resembles 
  that 
  of 
  other 
  species 
  of 
  

   Porcellana. 
  

  

  I 
  refer 
  it 
  doubtfully 
  to 
  F. 
  nitida 
  *, 
  which 
  is 
  very 
  briefly 
  de- 
  

   scribed, 
  and 
  diff"ers 
  apparently 
  in 
  the 
  triangulate 
  form 
  of 
  the 
  

   median 
  frontal 
  lobe, 
  and 
  in 
  having 
  an 
  additional 
  lateral 
  marginal 
  

   spine 
  behind 
  the 
  outer 
  angle 
  of 
  the 
  orbit 
  ; 
  but 
  as 
  Haswell's 
  types 
  

   were 
  from 
  Port 
  Denison, 
  at 
  which 
  locality 
  specimens 
  of 
  the 
  form 
  

   now 
  described 
  were 
  taken 
  by 
  Dr. 
  Coppinger, 
  I 
  distinguish 
  it 
  merely 
  

   as 
  a 
  variety. 
  

  

  10. 
  Porcellana 
  dispar, 
  Stimpson. 
  (Plate 
  XXX. 
  fig. 
  C.) 
  

  

  Four 
  males 
  and 
  two 
  females 
  from 
  Port 
  Jackson, 
  5-7 
  fms. 
  (No. 
  

   104), 
  are 
  referred 
  to 
  this 
  species, 
  which 
  Mr. 
  Haswell 
  (Cat. 
  p. 
  149) 
  

   observes 
  is 
  very 
  common 
  at 
  this 
  locality. 
  He 
  also 
  records 
  it 
  from 
  

   Port 
  Stc])heus. 
  

  

  kStimpson's 
  description 
  agrees 
  very 
  well 
  with 
  the 
  ad\ilt 
  males, 
  but 
  

  

  * 
  Vide 
  Hiiswell, 
  Catalogue, 
  p. 
  148 
  (1882). 
  

  

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