﻿PLATE 
  LXIII. 
  

  

  Sergestes 
  (?) 
  — 
  Development. 
  

  

  Platysacus 
  crenatus 
  (p. 
  363). 
  

   Fig. 
  1 
  . 
  Dorsal 
  view 
  ; 
  enlarged 
  seventy 
  times. 
  

   „ 
  2. 
  Rostrum 
  of 
  carapace 
  and 
  of 
  epistoma. 
  

   ,, 
  h. 
  First 
  antenna. 
  

   „ 
  c. 
  Second 
  antenna, 
  

   „ 
  i. 
  Second 
  gnathopod. 
  

  

  