﻿PLATE 
  XXVIII. 
  

  

  Astacopsis 
  spinifer 
  (p. 
  194). 
  

  

  The 
  lateral 
  wall 
  of 
  the 
  carapace 
  has 
  been 
  removed 
  to 
  show 
  the 
  branchial 
  arrangement 
  ; 
  

   podobranchise 
  removed 
  to 
  show 
  the 
  plan 
  of 
  the 
  branchiae 
  beneath 
  ; 
  arthrobranchiae 
  

   removed 
  from 
  the 
  first 
  two 
  pairs 
  of 
  pereiopoda 
  to 
  show 
  their 
  position 
  and 
  that 
  of 
  

   the 
  pleurobranchise. 
  

  

  k. 
  First 
  pair 
  of 
  pereiopoda. 
  

  

  pdh. 
  Podobranchige. 
  

  

  arh. 
  ArthrobraucluEe. 
  

  

  plh. 
  Pleurobrauchige. 
  

  

  rtit. 
  Movable 
  appendages, 
  probably 
  the 
  rudiments 
  of 
  the 
  foliaceous 
  appendages 
  

  

  that 
  form 
  the 
  ventral 
  incubatory 
  pouch 
  in 
  certain 
  genera. 
  

   d. 
  Siagon 
  or 
  mandible 
  ; 
  1 
  coxa, 
  2 
  basis, 
  3 
  terminal 
  joint, 
  

   e.' 
  First 
  siagnopod 
  ; 
  1 
  coxa, 
  2 
  basis, 
  3 
  ischium, 
  4 
  terminal 
  joint. 
  

   f. 
  Second 
  siagnopod 
  ; 
  1 
  coxa, 
  which 
  carries 
  the 
  mastigobranchial 
  plate 
  ; 
  other 
  

  

  numerals 
  as 
  before. 
  

   y. 
  Third 
  siagnopod 
  ; 
  numerals 
  as 
  before 
  ; 
  ec, 
  a 
  multiarticulate 
  ecphysis 
  of 
  the 
  

  

  basis. 
  

  

  h. 
  First 
  gnathopod 
  ; 
  1, 
  2, 
  3, 
  as 
  before 
  ; 
  4 
  meros, 
  5 
  carpos, 
  6 
  propodos. 
  

  

  i. 
  Second 
  gnathopod 
  ; 
  numerals 
  as 
  before; 
  ec, 
  ecphysis; 
  pdh, 
  podobranchia. 
  

  

  pdhr. 
  Podobranchia. 
  

  

  ai-h.a. 
  Anterior 
  arthrobranchia. 
  i 
  . 
  -. 
  . 
  -,. 
  ,- 
  ,• 
  

  

  . 
  > 
  Arranged 
  in 
  a 
  diagrammatic 
  section. 
  

  

  . 
  arbp. 
  Posterior 
  arthrobranchia. 
  

   plhr. 
  Pleurobranchia. 
  

  

  