﻿CRUSTACEA. 
  195 
  

  

  4 
  fms. 
  (No. 
  122), 
  length 
  to 
  base 
  of 
  rostrum 
  little 
  over 
  5 
  lines 
  

   (11 
  mm.), 
  and 
  in 
  a 
  small 
  male 
  from 
  Dundas 
  Straits 
  (No. 
  161), 
  the 
  

   rostral 
  spines 
  are 
  relatively 
  somewhat 
  shorter, 
  and 
  there 
  are 
  only 
  

   very 
  small 
  tubercles 
  in 
  the 
  place 
  of 
  the 
  lateral 
  epibranchial 
  spines 
  : 
  

   it 
  is 
  not 
  improbably 
  a 
  young 
  example 
  of 
  H. 
  diaccmthus. 
  There 
  

   are 
  specimens 
  presenting 
  very 
  similar 
  characters 
  in 
  the 
  collection 
  

   of 
  the 
  British 
  Museum 
  without 
  definite 
  locality 
  (H.M.S. 
  '■Samaramj 
  ') 
  

   and 
  from 
  Penang 
  (India 
  Museum). 
  

  

  There 
  are 
  specimens 
  in 
  the 
  British-Museum 
  collection 
  from 
  the 
  

   following 
  points 
  on 
  the 
  Australian 
  coast: 
  — 
  Dunk 
  Island, 
  and 
  lat. 
  

   20° 
  58' 
  S., 
  long. 
  149° 
  12' 
  E., 
  between 
  Cumberland 
  Island 
  and 
  

   Slade 
  Point 
  {J. 
  MacgUlivrmj, 
  H.M.S. 
  ' 
  Eattlesnake 
  '), 
  Brisbane 
  Water 
  

   (purchased), 
  Moreton 
  Bay 
  (purchased), 
  Swan 
  River 
  {Bring), 
  

   Shark 
  Bay, 
  "West 
  Australia 
  {Rayner, 
  H.M.S. 
  ' 
  Herald 
  '). 
  

  

  12. 
  Hyastenus 
  (Chorilia) 
  oryx. 
  

  

  Hvastenus 
  oryx, 
  A. 
  31.-Edwards, 
  Nouv. 
  Archiv. 
  Mus. 
  Hist. 
  Nat. 
  viii. 
  

   p. 
  250, 
  pi. 
  xiv. 
  fig. 
  1 
  (1872) 
  ; 
  Hnsivell, 
  Proc. 
  Linn. 
  Soc. 
  N. 
  S. 
  

   Wales, 
  iv. 
  p. 
  442 
  (1880) 
  ; 
  Cat. 
  Austr. 
  Crust, 
  p. 
  20 
  (1882). 
  

  

  To 
  this 
  species 
  are 
  referred 
  specimens 
  from 
  several 
  different 
  

   localities 
  ; 
  e. 
  (j. 
  from 
  the 
  fii'st 
  collection 
  two 
  males 
  and 
  a 
  female 
  

   from 
  Port 
  MoUe 
  — 
  the 
  males 
  obtained 
  between 
  5 
  and 
  14 
  fms. 
  (Nos. 
  

   93, 
  118), 
  and 
  the 
  female 
  on 
  the 
  beach 
  (No. 
  95) 
  ; 
  and 
  a 
  female 
  

   from 
  Port 
  Denison, 
  4 
  fms. 
  (No. 
  122) 
  ; 
  also 
  from 
  the 
  second 
  collec- 
  

   tion 
  a 
  good 
  series 
  from 
  Thursday 
  Island, 
  3-5 
  fms. 
  (Nos. 
  165, 
  177), 
  

   and 
  Prince 
  of 
  Wales 
  Channel, 
  7 
  fms. 
  (No. 
  169), 
  one 
  female. 
  

  

  M. 
  A. 
  Milne-Edwards's 
  types 
  were 
  from 
  New 
  Caledonia 
  ; 
  Mr, 
  

   Haswell 
  records 
  this 
  species 
  from 
  Darnley 
  Island, 
  Torres 
  Straits 
  ; 
  

   and 
  there 
  are 
  specimens 
  in 
  the 
  collection 
  of 
  the 
  British 
  Museum 
  

   from 
  Eaine's 
  Islet, 
  North-east 
  Australia 
  (J. 
  B. 
  Jukes), 
  Shark 
  Bay, 
  

   West 
  Australia 
  [Rayner, 
  H.M.S. 
  ' 
  Herald 
  '), 
  and 
  other 
  Austra- 
  

   lian 
  specimens 
  without 
  special 
  indication 
  of 
  locality 
  (BowerOank) 
  ; 
  

   also 
  from 
  the 
  Philippine 
  Islands, 
  Corregidor 
  (Cuming), 
  and 
  Chinese 
  

   seas 
  {H.M.S. 
  '■ 
  Samarang'). 
  

  

  In 
  the 
  second 
  part 
  of 
  this 
  Eeport 
  its 
  occurrence 
  is 
  noted 
  at 
  Provi- 
  

   dence 
  Island, 
  Masoarenes. 
  

  

  The 
  length 
  of 
  the 
  rostral 
  spines 
  and 
  prominence 
  of 
  the 
  prseocular 
  

   tooth 
  or 
  lobe 
  seems 
  to 
  vary 
  considerably 
  in 
  this 
  species 
  with 
  the 
  age 
  

   of 
  the 
  specimen. 
  I 
  regard 
  the 
  Lepidonaxia 
  de^lijjj^ii 
  of 
  Targioni- 
  

   Tozetti 
  *, 
  founded 
  on 
  a 
  female 
  example, 
  as 
  very 
  possibly 
  a 
  mere 
  

   variety 
  of 
  H. 
  orga; 
  from 
  which 
  it 
  scarcely 
  differs 
  except 
  in 
  these 
  

   particulars 
  and 
  in 
  the 
  less 
  numerous 
  and 
  prominent 
  tubercles 
  of 
  the 
  

   carapace. 
  Certainly 
  it 
  is 
  congeneric 
  with 
  that 
  species. 
  

  

  * 
  ' 
  Zoologia 
  della 
  Magenta 
  :' 
  Crostacei, 
  p. 
  5, 
  pi. 
  i. 
  figs. 
  4-6, 
  8, 
  10, 
  11 
  (1877). 
  

  

  