﻿PLATE 
  III. 
  

  

  Thalassina 
  scoiyionoides, 
  uat. 
  size 
  (p. 
  19). 
  

  

  <:. 
  Peduncle 
  of 
  fir.st 
  antenna 
  ; 
  c", 
  coxal 
  joint 
  seen 
  in 
  section, 
  showing 
  the 
  acoustic 
  

   apparatus 
  ; 
  d", 
  arrangement 
  of 
  hairs 
  within 
  the 
  chamber 
  ; 
  c"", 
  one 
  of 
  the 
  

   hairs 
  magnified. 
  

  

  d. 
  Siagon 
  or 
  mandible. 
  

  

  e. 
  First 
  siagnopod. 
  

  

  / 
  Second 
  siagnopod, 
  with 
  one 
  of 
  the 
  hairs 
  of 
  the 
  mastigobranchial 
  lash 
  magnified 
  in 
  

   sections. 
  

  

  