﻿(172 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  CHERAPS 
  PREISSII 
  Erichson. 
  

  

  AKtacHs 
  {('hcraps) 
  prclxsii 
  Erkiisox. 
  Arch. 
  f. 
  Naturgesch., 
  12ter 
  .Tahrg., 
  I, 
  p. 
  

  

  101, 
  J846. 
  

   f.tslacoidcs 
  pldu'jns 
  Hess, 
  Arch. 
  f. 
  Naturgesch., 
  31ter 
  Jahrg., 
  I, 
  p. 
  1(54, 
  pi. 
  vii, 
  tig. 
  

  

  17, 
  1X65. 
  

   AnlacuH 
  prtiasH 
  von 
  Martens, 
  Monatsber. 
  Akad. 
  AVisseiisch. 
  Berlin, 
  1868, 
  p. 
  617 
  

  

  (after 
  Erichson). 
  

   Astavopsis 
  preissii 
  Haswell, 
  Cat. 
  Australian 
  Stalk 
  and 
  .Sessile-eyed 
  Crust., 
  p. 
  

  

  177, 
  1882 
  (after 
  von 
  Martens). 
  

  

  Southwestern 
  Australia 
  (Erichson). 
  Erichson's 
  types 
  could 
  not 
  be 
  

   fomul 
  in 
  the 
  Berlin 
  Zoological 
  Museum 
  by 
  Doctor 
  von 
  Martens 
  in 
  1868. 
  

   Victoria, 
  Australia 
  (No. 
  435G, 
  Coll. 
  Mus. 
  Com]). 
  Zool., 
  one 
  male). 
  

  

  The 
  specimen 
  in 
  the 
  Museum 
  of 
  Comparative 
  Zoology 
  agrees 
  well 
  

   with 
  Erichson's 
  diagnosis, 
  so 
  far 
  as 
  it 
  goes. 
  It 
  shows 
  alow 
  postorbital 
  

   ridge 
  on 
  each 
  side 
  of 
  the 
  gastric 
  area, 
  terminating 
  anteriorly 
  in 
  a 
  

   minute 
  blunt 
  tubercle. 
  The 
  rostrum 
  is 
  flat 
  and 
  punctate, 
  lightly 
  margi- 
  

   nate, 
  the 
  margins 
  passing 
  anteriorly 
  into 
  the 
  short, 
  triangular 
  acumen 
  

   without 
  developing 
  lateral 
  spines 
  or 
  teeth. 
  The 
  areola 
  is 
  mu(;li 
  broader 
  

   than 
  in 
  G, 
  bicarinatus, 
  measuring 
  5.5 
  mm. 
  in 
  width 
  (length 
  of 
  the 
  whole 
  

   animal, 
  109 
  mm.). 
  The 
  outer 
  part 
  of 
  the 
  upper 
  surface 
  of 
  the 
  hand 
  is 
  

   thickly 
  sown 
  with 
  very 
  large, 
  deep 
  pits. 
  The 
  fingers 
  are 
  strongly 
  

   curved, 
  the 
  movable 
  one 
  armed 
  within 
  with 
  a 
  large, 
  blunt 
  tooth. 
  The 
  

   car])us 
  bears 
  a 
  long 
  and 
  stout 
  tubercle 
  on 
  its 
  inner 
  border; 
  this 
  tuber- 
  

   cle 
  is 
  curved 
  forward 
  and 
  is 
  blunt 
  at 
  the 
  end; 
  there 
  are, 
  besides, 
  a 
  few 
  

   low 
  tubercles 
  on 
  the 
  anterior 
  border 
  of 
  the 
  lower 
  face 
  of 
  the 
  carpus. 
  

   The 
  anterior 
  process 
  of 
  the 
  epistoma 
  is 
  bounded 
  behind 
  by 
  a 
  slight 
  

   transverse 
  furrow 
  ; 
  its 
  sides 
  are 
  very 
  convex, 
  and 
  its 
  anterior 
  angle 
  is 
  

   produced 
  so 
  as 
  to 
  form 
  a 
  thin, 
  vertical 
  plate. 
  

  

  Hess's 
  Astaco'idcs 
  i)lehejus 
  came 
  from 
  Sydney, 
  New 
  South 
  Wales. 
  

   The 
  sliai)e 
  of 
  the 
  large 
  chehe, 
  the 
  breadth 
  of 
  the 
  areola, 
  and 
  the 
  color 
  (yel- 
  

   lowish, 
  the 
  large 
  claws 
  dusky) 
  make 
  it 
  probable 
  that 
  this 
  specimen 
  was 
  

   Chcraps 
  preissii. 
  The 
  specimen 
  (dry) 
  of 
  C. 
  preissii 
  in 
  the 
  Museum 
  of 
  

   Comparative 
  Zoology 
  has 
  chelipeds 
  of 
  a 
  very 
  dark 
  jjurplish 
  color, 
  in 
  

   striking 
  contrast 
  with 
  the 
  yellow 
  hue 
  of 
  the 
  rest 
  of 
  the 
  Ixxly. 
  It 
  is 
  true 
  

   that 
  the 
  deej), 
  large 
  pits 
  seen 
  on 
  the 
  chehe 
  of 
  C. 
  preissii 
  are 
  ignored 
  in 
  

   both 
  the 
  description 
  and 
  the 
  figure 
  of 
  Astacoides 
  plebejus., 
  and 
  that 
  the 
  

   telson 
  has 
  a 
  very 
  different 
  shape, 
  if 
  Hess's 
  figure 
  be 
  correctly 
  drawn, 
  

   Ortmaun 
  treats 
  Astaco'ides 
  plehejus 
  as 
  a 
  synonym 
  of 
  CJieraps 
  preissii, 
  

   but 
  1 
  think 
  that 
  Ortmann's 
  specimen 
  of 
  C. 
  preissii 
  was 
  in 
  reality 
  C. 
  

   bieariiiatus. 
  (See 
  below.) 
  

  

  CHERAPS 
  BICARINATUS 
  (Gray). 
  

  

  Astacus 
  bicariiiatKS 
  Gray, 
  Eyre's 
  Journals 
  of 
  Expeditious 
  of 
  Discovery 
  into 
  

   Central 
  Australia, 
  I, 
  p. 
  410, 
  ])1. 
  iii, 
  tig. 
  2, 
  1845; 
  List 
  Crust. 
  Brit. 
  Mus., 
  ]). 
  72, 
  

   1847 
  (no 
  description). 
  

  

  Astacus 
  hicariudtiis 
  Erichson, 
  Arch. 
  f. 
  Naturgesch., 
  12ter 
  Jahrg., 
  I, 
  p. 
  376, 
  1846 
  

   (after 
  Gray). 
  

  

  