﻿276 
  COLLECTIONS 
  FKOM 
  MELANESIA. 
  

  

  he 
  does 
  not 
  notice 
  that 
  the 
  outer 
  margin 
  of 
  the 
  smaller 
  chelipede 
  

   is 
  armed 
  with 
  a 
  series 
  of 
  minute 
  spinules, 
  which 
  are 
  often 
  concealed 
  

   by 
  the 
  pubescence. 
  The 
  smaller 
  chelipede 
  in 
  the 
  adult 
  male 
  and 
  

   both 
  chelipedes 
  in 
  the 
  smaller 
  specimens 
  have 
  the 
  anterior 
  margin 
  

   of 
  the 
  wrist 
  armed 
  with 
  two 
  teeth, 
  and 
  in 
  the 
  smaller 
  specimens 
  

   (which 
  j-et 
  I 
  cannot 
  think 
  belong 
  to 
  a 
  distinct 
  species) 
  the 
  frontal 
  

   and 
  upper 
  orbital 
  margins 
  are 
  very 
  minutely 
  spinnlose. 
  There 
  is 
  

   developed 
  in 
  both 
  chelipedes 
  a 
  more 
  or 
  less 
  distinct 
  longitudinal 
  

   median 
  ridge 
  on 
  the 
  upper 
  surface 
  of 
  the 
  wrist 
  and 
  palm, 
  and 
  the 
  

   outer 
  margin 
  of 
  the 
  hand 
  in 
  both 
  is 
  armed 
  with 
  a 
  series 
  of 
  small 
  

   spinules, 
  so 
  that 
  these 
  specimens 
  in 
  many 
  points 
  resemble 
  Porcellana 
  

   ornata, 
  Stimpson, 
  from 
  Hong 
  Kong. 
  

  

  20. 
  Porcellana 
  quadrilohata. 
  (Plate 
  XXX. 
  fig. 
  D.) 
  

  

  In 
  the 
  single 
  male 
  from 
  Port 
  Denison, 
  4 
  fms., 
  thus 
  designated, 
  the 
  

   carapace 
  is 
  shaped 
  nearly 
  as 
  in 
  Porcellanella 
  triloha, 
  that 
  is, 
  it 
  is 
  much 
  

   longer 
  than 
  broad, 
  with 
  the 
  sides 
  very 
  slightly 
  arcuated. 
  The 
  upper 
  

   surface, 
  when 
  viewed 
  under 
  a 
  lens 
  of 
  sufficient 
  power, 
  is 
  seen 
  to 
  be 
  

   marked 
  with 
  numerous 
  rather 
  closely-set 
  transverse 
  strife. 
  The 
  inter- 
  

   antcnnulary 
  portion 
  of 
  the 
  front, 
  which 
  in 
  P. 
  triloba 
  is 
  entire, 
  is 
  in 
  P. 
  

   quadrilohata 
  divided 
  by 
  a 
  median 
  triangular 
  notch 
  (which, 
  however, 
  

   is 
  not 
  so 
  deep 
  as 
  the 
  lateral 
  notches), 
  hence 
  the 
  front 
  appears 
  4-lobed. 
  

   The 
  lobes 
  are 
  triangular 
  and 
  acute 
  ; 
  on 
  the 
  inner 
  margin 
  of 
  each 
  of 
  

   the 
  outer 
  lobes 
  is 
  a 
  small 
  spiuule, 
  and 
  the 
  inner 
  margins 
  of 
  each 
  of 
  

   the 
  inner 
  lobes 
  is 
  minutely 
  serrated. 
  There 
  is 
  a 
  very 
  small 
  tooth 
  or 
  

   spine 
  at 
  the 
  outer 
  orbital 
  angle, 
  and 
  posterior 
  to 
  this 
  the 
  sides 
  of 
  the 
  

   carapace 
  are 
  armed 
  with 
  five 
  spines, 
  tlie 
  three 
  posterior 
  of 
  which 
  are 
  

   placed 
  near 
  to 
  one 
  another 
  and 
  separated 
  by 
  a 
  somewhat 
  wider 
  in- 
  

   terval 
  from 
  the 
  preceding 
  tooth. 
  On 
  the 
  inferior 
  surface 
  of 
  the 
  cara- 
  

   pace, 
  below 
  the 
  inferior 
  orbital 
  margin, 
  there 
  is 
  a 
  strong 
  spine. 
  The 
  

   eyes 
  are 
  set 
  on 
  very 
  short 
  pedicels, 
  and 
  are 
  nearly 
  concealed 
  within 
  

   the 
  orbits. 
  The 
  joints 
  of 
  the 
  peduncles 
  of 
  the 
  antennce 
  are 
  short 
  (the 
  

   flagella 
  wanting 
  in 
  the 
  single 
  specimen 
  examined). 
  There 
  is 
  a 
  spine 
  

   at 
  the 
  distal 
  end 
  of 
  the 
  basus-joint 
  of 
  the 
  outer 
  maxillipedes 
  ; 
  the 
  

   ischium-joint 
  is 
  somewhat 
  dilated, 
  scarcely 
  at 
  all 
  emarginate 
  at 
  its 
  

   distal 
  end, 
  where 
  it 
  is 
  articulated 
  with 
  the 
  merus, 
  which 
  is 
  excavated 
  

   at 
  its 
  distal 
  extremity 
  ; 
  the 
  three 
  following 
  joints 
  are 
  moderately 
  

   robust. 
  The 
  chelipedes 
  are 
  proportionately 
  rather 
  slender 
  and 
  elon- 
  

   gated 
  ; 
  the 
  merus 
  or 
  arm 
  is 
  short, 
  its 
  inner 
  margin 
  somewhat 
  cristi- 
  

   form, 
  and 
  terminating 
  in 
  a 
  thin 
  subacute 
  lobe 
  ; 
  there 
  is 
  a 
  spine 
  also 
  

   on 
  the 
  under 
  surface 
  of 
  the 
  merus 
  ; 
  the 
  wrist 
  is 
  about 
  as 
  long 
  as 
  the 
  

   palm, 
  and 
  is 
  armed 
  with 
  three 
  spines 
  or 
  teeth 
  on 
  its 
  inner 
  margin 
  : 
  

   the 
  hand 
  is 
  slightly 
  contorted 
  : 
  the 
  surface 
  both 
  of 
  hand 
  and 
  wrist 
  

   finely 
  striated 
  ; 
  the 
  fingers 
  are 
  rather 
  shorter 
  than 
  the 
  palm, 
  meet 
  

   along 
  their 
  inner 
  edges 
  when 
  closed 
  and 
  cross 
  at 
  the 
  tips, 
  which 
  are 
  

   incurved 
  ; 
  at 
  the 
  bases 
  of 
  the 
  inner 
  margins 
  of 
  the 
  fingers 
  is 
  a 
  patch 
  

   of 
  hair 
  ; 
  the 
  lower 
  margin 
  of 
  the 
  lower 
  finger 
  is 
  armed 
  with 
  a 
  series 
  

   of 
  small 
  spinules. 
  The 
  ambulatory 
  legs 
  are 
  rather 
  slender 
  ; 
  there 
  are 
  

   a 
  few 
  short 
  stiff 
  sdce, 
  or 
  mobile 
  spines, 
  at 
  the 
  distal 
  end 
  of 
  the 
  

  

  