﻿PLATE 
  XIX. 
  

  

  Willemcesia 
  leptodactijla 
  (p. 
  163). 
  

  

  c. 
  Cephalon, 
  dorsal 
  aspect. 
  Large 
  variety; 
  enlarged 
  (p. 
  169). 
  

  

  o". 
  Cephalon, 
  dorsal 
  aspect. 
  Type 
  specimen. 
  

  

  ('"'. 
  Inferior 
  aspect 
  of 
  the 
  anterior 
  extremity 
  of 
  cephalon, 
  showing 
  first 
  and 
  second 
  pairs 
  

   of 
  antennae, 
  siagon, 
  third 
  pair 
  of 
  siagnopoda, 
  and 
  first 
  pair 
  of 
  gnathopoda, 
  all 
  

   in 
  position. 
  

  

  c"". 
  Metope 
  or 
  facial 
  region, 
  showing 
  ophthalmopoda 
  («,«), 
  position 
  of 
  first 
  pair 
  of 
  

   antennae 
  {b,b), 
  position 
  of 
  second 
  pair 
  of 
  antennae 
  {c,c). 
  

  

  b. 
  Coxa 
  of 
  first 
  antenna 
  with 
  ophthalmopod 
  («), 
  in 
  position. 
  

  

  h. 
  The 
  same 
  enlarged, 
  having 
  upper 
  surface 
  partially 
  removed 
  to 
  show 
  the 
  inteinal 
  

   structure 
  of 
  the 
  auditory 
  apparatus 
  (ac). 
  

  

  c. 
  Second 
  antenna 
  ; 
  view 
  from 
  the 
  upper 
  surface, 
  showing 
  the 
  reversed 
  position 
  of 
  the 
  

  

  extremity 
  of 
  the 
  phymacerite 
  (oi). 
  

  

  o. 
  Posterior 
  pair 
  of 
  pereiopoda 
  of 
  male, 
  showing 
  the 
  foramen 
  in 
  the 
  coxa 
  for 
  the 
  

   passage 
  of 
  the 
  vas 
  deferens. 
  

  

  2>, 
  t 
  ■ 
  First 
  pleopod 
  of 
  male, 
  in 
  relative 
  position. 
  

  

  q, 
  S 
  . 
  Second 
  pleopod 
  of 
  male, 
  showing 
  two 
  stylamblydes. 
  

  

  q, 
  $. 
  Second 
  pleopod 
  in 
  female, 
  showing 
  one 
  stylamblys. 
  

  

  P. 
  Pleon 
  ; 
  lateral 
  view. 
  

  

  pic. 
  Internal 
  dental 
  apparatus 
  at 
  the 
  pyloric 
  extremity 
  of 
  stomach. 
  

  

  