﻿PLATE 
  XLVII. 
  

  

  Pen.^id^ 
  (Development). 
  

  

  Fig. 
  1. 
  Aristeus 
  (?), 
  in 
  Megalopa 
  stage 
  (p. 
  241). 
  

  

  l^-. 
  First 
  pair 
  of 
  pereiopoda. 
  

  

  2. 
  Aristeus 
  (1), 
  younger 
  Megalopa 
  stage 
  (jj. 
  239). 
  

   Iv. 
  Fifth 
  somite 
  and 
  rhijiidura. 
  

  

  3. 
  Aristeus 
  (?), 
  older 
  Megalopa 
  stage 
  (p. 
  238). 
  

   36. 
  First 
  antenna. 
  

  

  3cZ. 
  Mandible, 
  showing 
  attachment 
  of 
  muscles. 
  

  

  Zk. 
  First 
  pereiopod. 
  

  

  