﻿540 
  COLLECTION'S 
  FROM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN. 
  

  

  fifth 
  or 
  last 
  pair 
  are 
  sliorter 
  than 
  the 
  preceding, 
  the 
  merus-joint 
  is 
  

   armed 
  with 
  a 
  spine 
  near 
  the 
  distal 
  end 
  of 
  its 
  posterior 
  margin, 
  the 
  

   penultimate 
  joint 
  has 
  its 
  posterior 
  margin 
  armed 
  with 
  a 
  series 
  of 
  

   epiaules, 
  the 
  last 
  joint 
  ovate, 
  of 
  the 
  form 
  usual 
  in 
  the 
  genus. 
  

   Colour 
  (in 
  spirit) 
  yellowish 
  white 
  ; 
  chelipedes 
  punctulated 
  exter- 
  

   nally 
  with 
  red, 
  and 
  fingers 
  broadly 
  banded 
  with 
  dark 
  brown 
  ; 
  the 
  

   ambulatory 
  legs 
  are 
  marked 
  with 
  dusky 
  spots 
  as 
  in 
  some 
  other 
  

   Thalainitce. 
  Length 
  of 
  carapace 
  nearly 
  1 
  inch 
  2 
  lines 
  (29 
  millim.), 
  

   breadth 
  to 
  apex 
  of 
  the 
  fifth 
  lateral 
  spines 
  about 
  1 
  inch 
  11 
  lines 
  

   (47 
  millim.) 
  ; 
  length 
  of 
  chelipede 
  nearly 
  2 
  inches 
  7 
  lines 
  (Go 
  

   millim.). 
  

  

  The 
  single 
  specimen 
  (an 
  adult 
  male) 
  was 
  obtained 
  at 
  the 
  Sey- 
  

   chelles, 
  4-12 
  fms. 
  (No. 
  194). 
  

  

  It 
  is 
  distinguished 
  from 
  all 
  other 
  Tlicdamitai 
  known 
  to 
  me 
  having 
  

   four 
  frontal 
  lobes 
  and 
  the 
  penultimate 
  joint 
  of 
  the 
  fifth 
  ambulatory 
  

   legs 
  denticulated, 
  by 
  the 
  form 
  of 
  the 
  lobes 
  of 
  the 
  front, 
  the 
  longer 
  

   fourth 
  lateral 
  marginal 
  spine 
  of 
  the 
  carapace, 
  and 
  the 
  strongly 
  

   spinulose 
  basal 
  antennal 
  joiut. 
  

  

  49. 
  Thalamita 
  Integra, 
  Dana. 
  

  

  Seychelles, 
  4-12 
  fms. 
  (No. 
  194) 
  ; 
  an 
  adult 
  male. 
  

  

  Two 
  very 
  small 
  specimens 
  collected 
  with 
  this 
  example 
  belong 
  

   either 
  to 
  T. 
  aclmete 
  or 
  T. 
  savir/m/i, 
  since 
  the 
  basal 
  antennal 
  joint 
  is 
  

   granulated. 
  

  

  Of 
  T. 
  Integra 
  there 
  are 
  specimens 
  in 
  the 
  British-Museum 
  col- 
  

   lection 
  from 
  the 
  Piji 
  Islands, 
  Nairai 
  {H.M.S. 
  'Herald'), 
  and 
  Sand- 
  

   wich 
  Islands 
  {U.ki. 
  Exploring 
  Expedition), 
  and 
  also 
  specimens 
  from 
  

   Honolulu 
  in 
  the 
  same 
  group 
  [Lieut. 
  Strickland), 
  besides 
  the 
  speci- 
  

   mens 
  of 
  the 
  Atlantic 
  variety 
  of 
  this 
  species 
  which 
  I 
  have 
  recently 
  

   designated 
  africana 
  *. 
  

  

  50. 
  Thalamita 
  crenata, 
  RiippeU. 
  

  

  Mozambique, 
  between 
  tide-marks 
  (No. 
  227) 
  ; 
  three 
  small 
  speci- 
  

   mens. 
  

  

  For 
  the 
  geographical 
  distribution 
  of 
  this 
  species 
  see 
  p. 
  232. 
  One 
  

   of 
  the 
  three 
  specimens 
  from 
  Mozambique 
  (a 
  male) 
  approaches 
  T. 
  

   stimpisonii 
  in 
  the 
  somewhat 
  smaller 
  fourth 
  tooth 
  of 
  the 
  lateral 
  

   margins, 
  but 
  there 
  are 
  no 
  granulations 
  upon 
  the 
  palms 
  of 
  the 
  

   chelipedes 
  as 
  usual 
  in 
  that 
  species, 
  

  

  51. 
  Thalamita 
  picta, 
  Stimpson. 
  

  

  A 
  small 
  male 
  from 
  the 
  beach, 
  Darros 
  Island 
  (No. 
  200), 
  is 
  < 
  d 
  

  

  here, 
  but 
  with 
  some 
  uncertainty, 
  as 
  the 
  fifth 
  ambulatory 
  legs 
  are 
  

   deficient. 
  

  

  In 
  a 
  male, 
  also 
  of 
  small 
  size 
  (length 
  of 
  carapace 
  about 
  7 
  lines, 
  

  

  * 
  Ami. 
  & 
  Mag. 
  Nat. 
  Hist. 
  ser. 
  5, 
  viii. 
  p, 
  218 
  (1881). 
  

  

  