﻿CEirSTACEA. 
  215 
  

  

  A 
  complete 
  revision 
  of 
  the 
  genus 
  would 
  be 
  necessary, 
  based 
  upon 
  

   the 
  comparative 
  study 
  of 
  types 
  and 
  of 
  a 
  much 
  larger 
  series 
  of 
  

   specimens 
  than 
  the 
  Museum 
  at 
  present 
  possesses, 
  in 
  order 
  to 
  deter- 
  

   mine 
  the 
  real 
  value 
  of 
  tlie 
  characters 
  ascribed 
  to 
  several 
  of 
  the 
  

   species, 
  which 
  I 
  think 
  will 
  be 
  shown 
  hereafter 
  to 
  be 
  merely 
  syno- 
  

   nyms 
  of 
  earlier-described 
  forms. 
  (See 
  on 
  this 
  question 
  Kossmann, 
  

   Zool. 
  Ergeb. 
  roth. 
  Meer. 
  pp. 
  32, 
  33, 
  1877.) 
  

  

  Two 
  very 
  small 
  males 
  obtained 
  on 
  the 
  beach 
  at 
  Thursday 
  Island 
  

   (second 
  collection, 
  No. 
  167) 
  are 
  apparently 
  intermediate 
  in 
  many 
  

   characters 
  between 
  this 
  genus 
  and 
  Etisodes, 
  which 
  they 
  resemble 
  in 
  

   general 
  appearance. 
  The 
  basal 
  antennal 
  joint 
  enters 
  the 
  inner 
  

   orbital 
  hiatus, 
  but 
  the 
  flagellum 
  is 
  just 
  excluded 
  from 
  it, 
  and 
  the 
  

   carapace 
  is 
  broader 
  than 
  in 
  Etisodes 
  and 
  is 
  shaped 
  as 
  in 
  Lcptodius 
  ; 
  

   the 
  frontal 
  lobes 
  are 
  truncated, 
  not 
  sinuated 
  as 
  in 
  Leptodiuslivklus 
  ; 
  

   the 
  anterior 
  margin 
  straight 
  : 
  there 
  are 
  five 
  distinct 
  acute 
  antero- 
  

   lateral 
  marginal 
  teeth 
  ; 
  the 
  carapace 
  is 
  slightly 
  lobulated 
  and 
  granulated 
  

   anteriorly, 
  plane 
  and 
  smcioth 
  posteriorly 
  ; 
  the 
  carpus 
  and 
  palms 
  of 
  

   the 
  chelipedes 
  rugose 
  ; 
  the 
  ambulatory 
  legs 
  somewhat 
  compressed. 
  

   Length 
  of 
  carapace 
  barely 
  4 
  lines. 
  

  

  47. 
  CMorodius 
  niger 
  (ForsJad). 
  

  

  A 
  single 
  female 
  of 
  this 
  very 
  common 
  Oriental 
  species 
  was 
  obtained 
  

   at 
  Port 
  Denison 
  in 
  4 
  fms. 
  (No. 
  111). 
  

  

  A 
  specimen 
  is 
  in 
  the 
  British 
  Museum 
  from 
  Port 
  Jackson 
  (C^fnjn'nr/). 
  

  

  C 
  niger 
  ranges 
  from 
  the 
  Red 
  Sea 
  and 
  the 
  Mascarene 
  Islands 
  

   eastward 
  through 
  the 
  Indian 
  Ocean 
  and 
  Malaysian 
  archipelago 
  to 
  

   the 
  islands 
  of 
  the 
  Pacific 
  (Samoa 
  and 
  Sandwich 
  Islands). 
  

  

  Specimens 
  are 
  in 
  the 
  collection 
  of 
  the 
  British 
  Museum 
  from 
  Egypt 
  

   {Col. 
  J. 
  Burton); 
  the 
  Gulf 
  of 
  ^uez 
  {R. 
  Mac 
  Andrew) 
  ; 
  Eed 
  Sea, 
  

   Daedalus 
  Shoal 
  {Lt.-Ool. 
  Play 
  fair); 
  El 
  Tor 
  {Major 
  MacDonald); 
  

   Seychelles 
  {Dr. 
  E. 
  P. 
  Wright); 
  Ceylon, 
  Galle 
  {Dr. 
  W. 
  Ondaatje); 
  

   Balabac 
  Straits 
  {Smithsonian 
  Institute, 
  Wdl'es 
  Expedition) 
  ; 
  New 
  

   Guinea 
  {Dr. 
  Bleelcers 
  Coll.) 
  ; 
  Philippine 
  Islands, 
  Guimaras 
  {Cuming), 
  

   designated 
  C. 
  hirtipes 
  by 
  Adams 
  and 
  White 
  : 
  Keeling 
  or 
  Cocos 
  

   Islands 
  {Lt. 
  Burnahy, 
  li.N.) 
  ; 
  Samoa 
  Islands, 
  Upolu 
  {Rev. 
  S. 
  J. 
  

   Whitmee), 
  and 
  Sandwich 
  Islands 
  (W. 
  II. 
  Pease). 
  

  

  Perhaps 
  the 
  CMorodius 
  rufescens, 
  Targioni-Tozetti*, 
  from 
  Java, 
  

   should 
  be 
  added 
  to 
  the 
  synonyma 
  of 
  this 
  species, 
  from 
  which 
  it 
  is 
  

   distinguished 
  by 
  its 
  author 
  by 
  the 
  longer, 
  more 
  convex 
  carapace, 
  

   with 
  more 
  acute 
  areolae 
  and 
  marginal 
  lateral 
  teeth. 
  MM. 
  A. 
  M.- 
  

   Edwards 
  and 
  De 
  Man 
  have 
  noticed 
  considerable 
  variation 
  in 
  the 
  

   degree 
  of 
  acuteness 
  of 
  the 
  antero-lateral 
  marginal 
  teeth 
  and 
  adjacent 
  

   tubercles 
  in 
  C. 
  niger-f. 
  

  

  * 
  ' 
  Crostacei 
  delta 
  Magenta,' 
  p. 
  43, 
  pi. 
  iv. 
  figs. 
  6-8, 
  10-12, 
  14, 
  18 
  (1877). 
  

   t 
  Vide 
  ' 
  Notes 
  from 
  the 
  Leytlen 
  Museum,' 
  ii. 
  p. 
  174 
  (1880). 
  

  

  