﻿538 
  COLLECTIONS 
  PKOM 
  THE 
  WESTERN 
  INDIAN 
  OCEAN. 
  

  

  43. 
  Xiphonectes 
  vigilans 
  (Dana), 
  var, 
  oMusidentatus. 
  

   (Plate 
  XL 
  VIII. 
  fig. 
  A.) 
  

  

  Thus 
  is 
  designated 
  a 
  female 
  with 
  ova, 
  from 
  the 
  Seychelles, 
  4-12 
  

   fms. 
  (No. 
  194), 
  which 
  may 
  be 
  specifically 
  distinct 
  from 
  Dana's 
  types, 
  

   which 
  were 
  collected 
  at 
  the 
  Fijis. 
  As, 
  however, 
  Dr. 
  F. 
  Ilichters 
  * 
  

   has 
  recently 
  recorded 
  X. 
  vigilans 
  from 
  the 
  Seychelles, 
  and 
  notes 
  

   important 
  variations 
  in 
  the 
  number 
  of 
  the 
  antero-lateral 
  marginal 
  

   teeth, 
  I 
  do 
  not 
  at 
  present 
  venture 
  to 
  separate 
  the 
  specimen 
  before 
  

   me 
  from 
  this 
  species. 
  It 
  is 
  distinguished 
  from 
  X. 
  vir/ihins 
  and 
  

   X. 
  lonr/isjnnosus, 
  as 
  figured 
  by 
  Dana, 
  and 
  also 
  from 
  X. 
  leptochelcs, 
  

   A. 
  M.-Edwards, 
  by 
  the 
  form 
  of 
  the 
  frontal 
  lobes, 
  which 
  are 
  not 
  

   triangulate 
  and 
  acute, 
  but 
  obtuse 
  and 
  broadly 
  rounded, 
  so 
  that 
  the 
  

   two 
  i)rominent 
  submcdian 
  lobes 
  are 
  semicircular 
  in 
  form. 
  There 
  

   are 
  eight 
  antero-lateral 
  marginal 
  teeth 
  on 
  one 
  side 
  and 
  seven 
  on 
  

   the 
  other 
  (including 
  the 
  outer 
  orbital 
  tooth, 
  but 
  excluding 
  the 
  long 
  

   lateral 
  spine) 
  ; 
  these 
  teeth 
  are 
  very 
  irregular 
  and 
  unequally 
  deve- 
  

   loped. 
  

  

  Specimens 
  which 
  I 
  refer 
  to 
  X 
  vigilans, 
  Dana, 
  are 
  in 
  the 
  Eritish- 
  

   Museum 
  collection 
  from 
  the 
  Eiji 
  Islands, 
  ^. 
  e. 
  Nairai, 
  Ovalau, 
  and 
  

   Matuka 
  (B.M.S. 
  ' 
  Herald 
  '). 
  These 
  all 
  have 
  the 
  submedian 
  frontal 
  

   teeth 
  more 
  triangulate 
  than 
  in 
  the 
  specimen 
  from 
  the 
  Seychelles 
  ; 
  

   in 
  the 
  largest 
  specimen, 
  which 
  is 
  about 
  as 
  large 
  as 
  the 
  example 
  from 
  

   Seychelles, 
  they 
  are 
  very 
  prominent 
  and 
  acute. 
  The 
  antero-lateral 
  

   marginal 
  teeth 
  are 
  much 
  more 
  regularly 
  and 
  evenly 
  developed, 
  and 
  

   vary 
  from 
  five 
  to 
  nine 
  in 
  number; 
  they 
  are 
  least 
  numerous 
  in 
  the 
  

   largest 
  example. 
  

  

  44. 
  Scylla 
  serrata 
  (ForsW). 
  

  

  A 
  small 
  male 
  is 
  in 
  the 
  collection 
  from 
  Mozambique, 
  between 
  tide- 
  

   marks 
  (Xo. 
  227). 
  

  

  As 
  is 
  usual 
  in 
  immature 
  examples, 
  this 
  specimen 
  has 
  the 
  teeth 
  of 
  

   the 
  front 
  very 
  obscurely 
  developed. 
  

  

  Specimens 
  of 
  this 
  very 
  common 
  species 
  are 
  in 
  the 
  Museum 
  col- 
  

   lection 
  from 
  the 
  Mauritius 
  (Lady 
  F. 
  Cole) 
  ; 
  Port 
  Natal 
  ; 
  S. 
  Africa, 
  

   at 
  the 
  mouth 
  of 
  the 
  Swartkopfs 
  Eiver 
  (7)r. 
  A. 
  Smith); 
  Dukhun 
  

   (Col. 
  Sylrs); 
  Bali 
  and 
  W. 
  Borneo 
  (coll. 
  Dr. 
  Bleel-er); 
  Philippines, 
  

   Luzon 
  (Cuming) 
  ; 
  Hong 
  Kong, 
  China 
  (J. 
  Reeves) 
  ; 
  Fijis, 
  Yanua 
  

   Levu 
  and 
  Bau 
  (H.M.8. 
  ' 
  Herald 
  ') 
  ; 
  and 
  New 
  Caledonia 
  (J. 
  Mac- 
  

   gillivray). 
  

  

  45. 
  Achelous 
  granulatus, 
  M.-Ediu. 
  

  

  Seychelles, 
  4-12 
  fms., 
  a 
  female 
  with 
  ova 
  (No. 
  li)4). 
  

   The 
  distribution 
  of 
  this 
  species 
  has 
  been 
  already 
  noticed 
  on 
  

   p. 
  230. 
  

  

  * 
  In 
  Mubius's 
  ' 
  Beitr. 
  zur 
  Meeresfauua 
  der 
  Mauritius 
  uud 
  der 
  S'.'jchclleD,' 
  

   Decapoda, 
  p. 
  152 
  (1880). 
  

  

  