﻿NO. 
  1136. 
  OBSERVATIOXS 
  OX 
  THE 
  ASTACIDJ;— 
  FAXON. 
  661) 
  

  

  Astacus 
  caldwelli 
  Bate, 
  Proc. 
  ZodI. 
  Soc. 
  Londou, 
  1865, 
  p. 
  469, 
  pi. 
  xxvii. 
  

   Astaroidrs 
  madagascaricnsls 
  Hixley, 
  Proc. 
  Zool. 
  Soc. 
  Londou, 
  1878, 
  p. 
  759, 
  fig. 
  

   2 
  B 
  ; 
  p. 
  773, 
  fig. 
  7 
  ; 
  The 
  Craytisb, 
  p. 
  251, 
  tig. 
  65, 
  1880. 
  

  

  Habitat. 
  — 
  Madagascar. 
  

  

  The 
  only 
  specimen 
  of 
  this 
  species 
  that 
  I 
  Lave 
  seen 
  is 
  Giierin's 
  type, 
  

   in 
  the 
  Museum 
  of 
  the 
  Academy 
  of 
  Xatural 
  Sciences 
  of 
  Phihidelpliia 
  

   (No. 
  200, 
  Guerin 
  Coll.). 
  The 
  color 
  in 
  life, 
  according 
  to 
  Goudot, 
  is 
  

   brownish 
  green. 
  

  

  ASTACOPSIS 
  Huxley. 
  • 
  

  

  Astavopxis 
  Huxley, 
  Proc. 
  Zool. 
  Soc. 
  Loudou, 
  1878, 
  p. 
  764. 
  

   Type, 
  Asfaciis 
  franklinii 
  Gi:iy. 
  

  

  Rostrum 
  triangular, 
  concave 
  above, 
  margins 
  toothed, 
  Anteuual 
  

   scale 
  of 
  moderate 
  width, 
  tapering 
  off 
  to 
  an 
  apical 
  spine. 
  Anterior 
  

   ])rocess 
  of 
  epistome 
  long 
  triangular, 
  Superior 
  border 
  of 
  hand 
  dentate. 
  

   Carapace 
  and 
  abdomen 
  more 
  or 
  less 
  tuberculous 
  or 
  spinous, 
  at 
  least 
  in 
  

   mature 
  individuals. 
  Form 
  homaroid. 
  Twenty-one 
  gills 
  on 
  each 
  side 
  

   of 
  the 
  trunk, 
  disposed 
  as 
  shown 
  in 
  the 
  following 
  formula 
  : 
  

  

  Akthhobeanchi^e. 
  

  

  Somite. 
  rouoBKAxcHi^. 
  ^ 
  Pleurohkanchi.e. 
  

  

  Anterior. 
  Posterioi-. 
  

  

  VII. 
  . 
  . 
  . 
  O(epr) 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  := 
  0(ep/-) 
  

  

  VIII. 
  ...1....1....0....0 
  =2 
  

  

  IX. 
  ... 
  1 
  .... 
  1 
  .... 
  1 
  .... 
  =3 
  

  

  X. 
  ... 
  1 
  .... 
  I 
  .... 
  1 
  .... 
  =3 
  

  

  XI. 
  ... 
  1 
  .... 
  1 
  .... 
  1 
  .... 
  1 
  =4 
  

  

  XII. 
  ...1....1....1....1 
  =4 
  

  

  XIII. 
  ...1....1....1....1 
  =4 
  

  

  XIV. 
  ... 
  .... 
  .... 
  .... 
  1 
  =1 
  

  

  6 
  -}- 
  ep 
  r 
  -|- 
  6 
  + 
  5 
  + 
  4 
  ^= 
  21 
  + 
  ep 
  r 
  

  

  Habitat. 
  — 
  Australia 
  and 
  Tasmania. 
  

  

  ASTACOPSIS 
  FRANKLINII 
  Gray. 
  

  

  Astacus 
  frankUiiii 
  Guay, 
  Eyres 
  .Toiiruals 
  of 
  Expeditions 
  of 
  Discovery 
  into 
  Ceu- 
  

  

  tral 
  Australia, 
  I, 
  p. 
  409, 
  pi. 
  in, 
  lig. 
  1, 
  1845; 
  last 
  Crust. 
  Brit. 
  Mus., 
  p. 
  72, 
  

  

  1847 
  (no 
  description). 
  

   Astacus 
  fiankUnii 
  Ericiisox, 
  Arch. 
  f. 
  Naturgesch., 
  12ter 
  Jahrg., 
  I, 
  p. 
  375, 
  1846 
  

  

  (after 
  Gray). 
  

   Asta(02)sis 
  franklinii 
  Huxley, 
  Proc. 
  Zool. 
  Soc. 
  London, 
  1878, 
  p. 
  764, 
  tigs. 
  4,5. 
  

   Aslacopsisfrduklinii 
  Has 
  WELL, 
  Cat. 
  Australian 
  Stalk- 
  and 
  Sessile-eyed 
  Crustacea, 
  

  

  p. 
  176, 
  1882 
  (after 
  Gray). 
  

  

  Habitat. 
  — 
  Tasmania. 
  One 
  specimen 
  (male), 
  06 
  mm. 
  long, 
  in 
  Museum 
  

   of 
  Comparative 
  Zoology 
  (No. 
  1140), 
  from 
  Hobart 
  Town, 
  Mr. 
  Robertson. 
  

   The 
  angles 
  of 
  the 
  abdominal 
  pleune 
  in 
  this 
  specimen 
  tend 
  to 
  develop 
  

   spiny 
  points. 
  

  

  Astacopsis 
  franklinii 
  is 
  similar 
  in 
  external 
  appearance 
  to 
  the 
  ^Nlada- 
  

   gascar 
  crayfi.s'h 
  {Astaco'i^es 
  madatjascariensifi). 
  The 
  latter, 
  however, 
  as 
  

   has 
  been 
  shown 
  by 
  Huxley, 
  has 
  the 
  number 
  of 
  gills 
  reduced 
  to 
  twenty 
  

   four, 
  against 
  forty-two 
  in 
  the 
  former, 
  A. 
  franklinii 
  appears 
  to 
  be 
  rep- 
  

  

  