﻿654 
  COLLECTIONS 
  FROM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN, 
  

  

  seems 
  to 
  be 
  most 
  nearlj' 
  allied 
  to 
  Pseudodromia, 
  Stimpson 
  *, 
  of 
  which 
  

   I 
  have 
  sceu 
  no 
  specimens, 
  but 
  is 
  distinguished 
  by 
  the 
  flattened 
  cara- 
  

   pace, 
  the 
  different 
  form 
  of 
  the 
  front, 
  which 
  joins 
  the 
  antennulary 
  

   septum, 
  and 
  the 
  much 
  shorter 
  fifth 
  ambulatory 
  legs. 
  

  

  3. 
  Homalodromia 
  coppingeri. 
  (Plate 
  L. 
  fig. 
  B.) 
  

  

  Carapace 
  (in 
  the 
  female) 
  flattened 
  above, 
  with 
  the 
  frontal 
  region 
  

   slightly 
  deflexed, 
  the 
  sides 
  convergent 
  to 
  the 
  posterior 
  margin 
  from 
  

   the 
  hepatic 
  regions. 
  The 
  front 
  is 
  about 
  one-half 
  of 
  the 
  greatest 
  

   width 
  of 
  the 
  carapace 
  ; 
  the 
  two 
  lobes 
  of 
  "which 
  it 
  is 
  composed 
  are 
  

   separated 
  to 
  their 
  bases 
  by 
  a 
  rather 
  wide 
  interspace, 
  and 
  each 
  lobo 
  

   has 
  a 
  wide 
  and 
  rather 
  shallow 
  excavation 
  at 
  its 
  distal 
  extremity, 
  

   "with 
  the 
  antcro 
  -lateral 
  angles 
  produced 
  and 
  spiniform. 
  There 
  is 
  a 
  

   small 
  spine 
  or 
  tooth 
  at 
  the 
  exterior 
  orbital 
  angle, 
  and 
  one 
  at 
  the 
  

   inner 
  inferior 
  orbital 
  angle. 
  The 
  sternal 
  tubercles 
  are 
  somewhat 
  

   elongated 
  and 
  divergent 
  from 
  their 
  bases. 
  The 
  eyes 
  are 
  deeply 
  set 
  

   in 
  the 
  small 
  orbits. 
  The 
  second 
  peduncular 
  joint 
  of 
  the 
  antennae 
  

   terminates 
  in 
  two 
  spines, 
  and 
  thus 
  appears 
  furcated 
  at 
  its 
  distal 
  ex- 
  

   tremity 
  ; 
  the 
  antennal 
  flagella 
  are 
  considerably 
  elongated. 
  The 
  

   merus-joiut 
  of 
  the 
  outer 
  maxillipedcs 
  is 
  about 
  as 
  long 
  as 
  the 
  

   ischium-joint, 
  and 
  widens 
  somewhat 
  to 
  its 
  distal 
  extremity, 
  which 
  

   is 
  truncated 
  ; 
  it 
  bears 
  the 
  next 
  joint 
  at 
  the 
  inner 
  end 
  of 
  its 
  distal 
  

   margin 
  ; 
  the 
  narrow, 
  straight 
  exoguath 
  reaches 
  to 
  the 
  distal 
  end 
  

   of 
  the 
  merus. 
  The 
  chelipedes 
  (in 
  the 
  female) 
  are 
  rather 
  shorter 
  

   and 
  little 
  more 
  robust 
  than 
  the 
  following 
  joints, 
  with 
  the 
  arm 
  

   and 
  merus 
  short 
  and 
  unarmed, 
  wrist 
  with 
  two 
  spines 
  on 
  its 
  

   outer 
  surface 
  near 
  the 
  distal 
  extremitj^; 
  palm 
  about 
  as 
  long 
  as 
  fingers, 
  

   rounded 
  above 
  and 
  below, 
  and 
  without 
  spines 
  ; 
  fingei's 
  dentated 
  on 
  

   their 
  inner 
  margins 
  and 
  at 
  the 
  semi-excavated 
  distal 
  extremity 
  ; 
  

   the 
  second 
  and 
  third 
  legs 
  are 
  without 
  spines 
  or 
  tubercles, 
  with 
  the 
  

   dactyli 
  slightly 
  shorter 
  than 
  the 
  penultimate 
  joints, 
  terminating 
  in 
  

   a 
  corneous 
  claw, 
  and 
  bearing, 
  as 
  already 
  stated, 
  two 
  or 
  three 
  accessory 
  

   spinules 
  ; 
  in 
  the 
  fourth 
  legs 
  the 
  strongly 
  curved 
  dactyl 
  is 
  unarmed 
  

   and 
  about 
  equals 
  the 
  penultimate 
  joint 
  in 
  length 
  ; 
  in 
  the 
  fifth 
  legs 
  

   the 
  merus 
  is 
  slender 
  and 
  elongated, 
  longer 
  than 
  the 
  following 
  joint 
  ; 
  

   the 
  spiniform 
  process 
  of 
  the 
  penultimate 
  joint 
  is 
  strongly 
  curved 
  and 
  

   constitutes 
  with 
  the 
  dactyl 
  a 
  perfectly 
  formed 
  prehensile 
  organ. 
  

   Colour 
  (in 
  spirit) 
  pinkish 
  ; 
  the 
  body 
  is 
  everywhere 
  closely 
  pubescent 
  : 
  

   Iqnger 
  hairs 
  clothe 
  the 
  margins 
  of 
  the 
  carapace 
  at 
  the 
  hepatic 
  

   regions 
  and 
  the 
  margins 
  of 
  the 
  postabdominal 
  segments 
  and 
  legs. 
  

   Length 
  of 
  the 
  carapace 
  of 
  the 
  single 
  example 
  (an 
  adult 
  female) 
  

   to 
  end 
  of 
  rostrum 
  nearly 
  Sg 
  lines 
  (7 
  millim.), 
  breadth 
  a 
  little 
  less 
  ; 
  

   length 
  of 
  first 
  ambulatory 
  leg 
  about 
  4| 
  lines 
  (nearly 
  11 
  millim.); 
  of 
  

   fifth 
  leg 
  3|- 
  lines 
  (nearly 
  8 
  millim.). 
  

  

  The 
  single 
  specimen 
  w^as 
  coUected 
  at 
  Providence 
  lleef, 
  24 
  fms. 
  

   (No. 
  215), 
  and 
  has 
  the 
  carapace 
  somewhat 
  crushed 
  on 
  the 
  dorsal 
  

   surface 
  and 
  the 
  fifth 
  ambulatory 
  legs 
  detached. 
  

  

  * 
  Proc. 
  Acad. 
  Nat. 
  Sci. 
  Philad. 
  p. 
  225 
  (1858). 
  

  

  