﻿CRUSTACEA. 
  

  

  313 
  

  

  Leucothoe 
  ? 
  crassimana, 
  Kossinann, 
  Zool. 
  Ergehn. 
  einer 
  Reise 
  rothen 
  

   Meeres, 
  Malacostraca, 
  p. 
  131, 
  pi. 
  xiii. 
  figs. 
  9, 
  10 
  (1880). 
  

  

  Leucothoe 
  commensalis, 
  Hasioell, 
  Proc. 
  Linn. 
  Soc. 
  N. 
  S. 
  Wales, 
  iv. 
  

   p. 
  201, 
  pi. 
  X. 
  tig. 
  3 
  (1880) 
  ; 
  Cat. 
  Austr. 
  Crust, 
  p. 
  248 
  (1882), 
  var. 
  

  

  I 
  refer 
  to 
  this 
  species 
  a 
  single 
  specimen 
  from 
  Port 
  Jackson, 
  0-5 
  

   fms. 
  It 
  differs 
  oiily 
  in 
  the 
  greater 
  length 
  of 
  the 
  superior 
  antennae 
  

   from 
  Mr. 
  Haswell's 
  description 
  of 
  L. 
  commensalis, 
  these 
  exceeding 
  

   in 
  length 
  the 
  head 
  and 
  first 
  four 
  segments 
  of 
  the 
  body. 
  It 
  ranges 
  

   along 
  the 
  whole 
  eastern 
  coast 
  of 
  Australia, 
  from 
  Thursday 
  Island 
  in 
  

   the 
  north 
  to 
  Western 
  Port 
  in 
  the 
  south. 
  

  

  Mr.Haswell 
  describes 
  this 
  as 
  being 
  one 
  of 
  the 
  commonest 
  Amphi- 
  

   poda 
  of 
  Port 
  Jackson, 
  where 
  it 
  is 
  found 
  within 
  the 
  pharynx 
  of 
  a 
  

   common 
  large 
  tunicate, 
  in 
  the 
  cavities 
  of 
  large 
  sponges, 
  and 
  in 
  other 
  

   similar 
  situations. 
  A 
  mutilated 
  specimen 
  is 
  in 
  the 
  Museum 
  collec- 
  

   tion 
  from 
  this 
  localit}', 
  received 
  from 
  J. 
  Brazier, 
  Esq. 
  

  

  It 
  is 
  not 
  without 
  much 
  hesitation 
  that 
  I 
  unite 
  L. 
  commensalis 
  

   with 
  the 
  European 
  L. 
  articulosa, 
  yet 
  upon 
  comparison 
  of 
  the 
  

   Australian 
  specimens 
  of 
  L. 
  covunensalls 
  with 
  the 
  specimens 
  from 
  

   Great 
  Britain 
  and 
  Norway 
  in 
  the 
  British-Museum 
  collection 
  I 
  can 
  

   detect 
  no 
  difference 
  of 
  specific 
  importance. 
  In 
  one 
  English 
  speci- 
  

   men 
  the 
  eyes 
  are 
  reddish, 
  in 
  another 
  Australian 
  example 
  reddish 
  

   black, 
  and 
  in 
  others 
  scarcely 
  any 
  trace 
  of 
  the 
  pigment 
  remains. 
  

   There 
  are 
  variations 
  in 
  the 
  length 
  of 
  the 
  antennae 
  and 
  in 
  the 
  form 
  

   of 
  the 
  antero-lateral 
  processes 
  of 
  the 
  first 
  segment 
  of 
  the 
  body, 
  and 
  

   also 
  in 
  the 
  degree 
  of 
  acuteness 
  of 
  the 
  apex 
  of 
  the 
  carpal 
  process 
  of 
  

   the 
  second 
  pair 
  of 
  legs, 
  which, 
  however, 
  I 
  cannot 
  connect 
  with 
  the 
  

   geographical 
  habitat 
  of 
  the 
  individuals 
  examined. 
  As, 
  however, 
  the 
  

   series 
  the 
  Museum 
  possesses 
  is 
  but 
  small, 
  and 
  there 
  are 
  in 
  the 
  

   national 
  collection 
  no 
  specimens 
  from 
  localities 
  intermediate 
  between 
  

   Great 
  Britain 
  and 
  Australia, 
  it 
  may 
  be 
  well 
  to 
  consider 
  Mr. 
  Has- 
  

   well's 
  species 
  as 
  a 
  variety, 
  since 
  there 
  may 
  be 
  distinctive 
  characters 
  

   discoverable 
  in 
  the 
  colour 
  of 
  the 
  eyes, 
  or 
  in 
  other 
  minor 
  particulars. 
  

   The 
  eyes 
  in 
  Abildgaard's 
  original 
  description 
  are 
  described 
  as 
  

   black. 
  

  

  Kossmann's 
  species 
  {L. 
  crassimana), 
  from 
  the 
  Red 
  Sea, 
  is 
  only 
  

   briefly 
  characterized, 
  but 
  the 
  details 
  figured 
  would 
  seem 
  to 
  show 
  

   that 
  this 
  species 
  is 
  also 
  identical 
  with 
  or 
  very 
  nearly 
  allied 
  to 
  

   L. 
  articulosa. 
  

  

  3. 
  Leucothoe 
  brevidigitata. 
  (Plate 
  XXXIV. 
  fig. 
  A.) 
  

  

  The 
  body 
  is 
  smooth, 
  dorsally 
  rounded 
  and 
  laterally 
  compressed 
  ; 
  

   the 
  coxae 
  of 
  the 
  first 
  four 
  legs 
  deep, 
  as 
  in 
  allied 
  forms. 
  Head 
  small, 
  

   with 
  a 
  very 
  small 
  median 
  rostral 
  lobe, 
  its 
  antero-lateral 
  angles 
  

   rounded 
  and 
  not 
  much 
  produced. 
  The 
  coxae 
  of 
  the 
  fourth 
  legs 
  are 
  

   but 
  little 
  longer 
  than 
  the 
  preceding, 
  without 
  any 
  distinct 
  postero- 
  

   lateral 
  lobe 
  ; 
  they 
  are 
  slightly 
  overlapped 
  by 
  the 
  much 
  shorter 
  coxae 
  

   of 
  the 
  fifth 
  legs. 
  There 
  is 
  a 
  very 
  small 
  acute 
  tooth 
  at 
  the 
  postero- 
  

   lateral 
  angles 
  of 
  the 
  first 
  tail-segment 
  ; 
  these 
  angles 
  in 
  the 
  second 
  

  

  