﻿PLATE 
  CXLIX. 
  

  

  Fia;. 
  1. 
  Sylon 
  chaUengeri, 
  attached 
  to 
  Spirontocaris 
  spwus, 
  a 
  part 
  of 
  the 
  right 
  side 
  of 
  

   the 
  Shrimp 
  having 
  been 
  taken 
  away; 
  x, 
  the 
  injured 
  part 
  at 
  the 
  surface 
  of 
  the 
  

   sac 
  ; 
  I., 
  II., 
  III., 
  IV., 
  and 
  V., 
  the 
  first 
  to 
  the 
  fifth 
  pleopods 
  of 
  the 
  left 
  side 
  of 
  

   the 
  Shrimp 
  ; 
  V«, 
  the 
  fifth 
  pleopod 
  of 
  the 
  right 
  side. 
  Magnified 
  1 
  3 
  diameters. 
  

  

  ,, 
  2. 
  Sylon 
  chaUengeri, 
  seen 
  from 
  below, 
  with 
  a 
  part 
  of 
  the 
  wall 
  of 
  the 
  host 
  

   attached 
  ; 
  e, 
  the 
  ovary 
  of 
  the 
  parasite. 
  Magnified 
  1 
  2 
  diameters. 
  

  

  ,, 
  3. 
  Sylon 
  chaUengeri, 
  front 
  view 
  ; 
  x, 
  the 
  injured 
  part 
  at 
  the 
  surface. 
  Magnified 
  12 
  

   diameters. 
  

  

  ,, 
  4. 
  Sylon 
  sclmeideri, 
  front 
  A-iew 
  ; 
  a. 
  openings 
  leading 
  into 
  the 
  mantle-cavity 
  ; 
  B, 
  

   transverse 
  section 
  oi 
  Hippolyte 
  pusiola. 
  Magnified 
  12 
  diameters. 
  

  

  ,, 
  5. 
  Sylon 
  schneideri, 
  seen 
  from 
  the 
  side, 
  the 
  lateral 
  parts 
  of 
  the 
  exoskeleton 
  of 
  the 
  

   second 
  and 
  third 
  abdominal 
  segment 
  of 
  the 
  Hlppolyte 
  being 
  taken 
  away 
  ; 
  

   a 
  and 
  B 
  as 
  in 
  fig. 
  4 
  ; 
  II. 
  -IV., 
  second 
  to 
  fourth 
  pleopod. 
  Magnified 
  

   12 
  diameters. 
  

  

  