﻿PLATE 
  CL. 
  

  

  Fig. 
  1. 
  Sylon 
  challengeri, 
  part 
  of 
  a 
  ti-ansverse 
  section, 
  passing 
  through 
  the 
  ovary, 
  e, 
  

   and 
  the 
  " 
  Eikittdruse," 
  A 
  ; 
  a, 
  connective 
  tissue 
  of 
  the 
  mantle 
  ; 
  b, 
  epithelium 
  

   suri'ounding 
  the 
  visceral 
  mass 
  ; 
  c, 
  ramified 
  tubes 
  of 
  the 
  gland 
  ; 
  d, 
  female 
  

   genital 
  pore. 
  Magnified 
  13G 
  diameters. 
  

  

  ,, 
  2. 
  Part 
  of 
  the 
  mantle 
  and 
  visceral 
  mass 
  of 
  S;/luii 
  schneideri; 
  a, 
  connective 
  tissuu 
  

   of 
  the 
  mantle 
  ; 
  h, 
  epithelium 
  surrounding 
  the 
  visceral 
  mass 
  ; 
  e, 
  ovary 
  ; 
  f, 
  

   chitinous 
  outer 
  wall 
  of 
  the 
  mantle 
  ; 
  g, 
  thickening 
  of 
  the 
  chitinous 
  outer 
  wall 
  

   at 
  the 
  place 
  where 
  later 
  on 
  the 
  openings 
  of 
  the 
  mantle-cavity 
  occur 
  ; 
  h, 
  

   epithelium 
  of 
  the 
  outer 
  side 
  of 
  the 
  mantle 
  ; 
  i, 
  epithelium 
  at 
  the 
  inner 
  side 
  

   of 
  the 
  mantle; 
  I, 
  blood-plasma 
  (?) 
  ; 
  n, 
  nervous 
  system. 
  Magnified 
  136 
  

   diameters. 
  

  

  ,, 
  3. 
  Part 
  of 
  the 
  visceral 
  mass 
  of 
  Sylon 
  schneideri 
  ; 
  b 
  and 
  e 
  as 
  in 
  fig. 
  2 
  ; 
  c, 
  connective 
  

   tissue 
  ; 
  I, 
  blood-plasma 
  (?). 
  Magnified 
  136 
  diameters. 
  

  

  ,, 
  4. 
  Section 
  through 
  a 
  part 
  of 
  Hippohjte 
  pusiola, 
  with 
  Sylon 
  schneideri 
  attached 
  

   to 
  it 
  ; 
  e, 
  ovary 
  of 
  the 
  parasite 
  ; 
  ii, 
  nervous 
  system 
  of 
  the 
  Hippolyte 
  ; 
  B, 
  

   basilary 
  membrane 
  ; 
  r, 
  roots 
  of 
  the 
  Sylon 
  ; 
  m, 
  abdominal 
  flexor 
  muscles 
  of 
  

   the 
  host. 
  Magnified 
  30 
  diameters. 
  

  

  ,, 
  5. 
  Section 
  in 
  front 
  of 
  the 
  attachment 
  of 
  Sylon 
  schneidej-i 
  to 
  Hippolyte 
  pusiola 
  ; 
  

   e, 
  m, 
  n, 
  and 
  r 
  as 
  in 
  fig. 
  4 
  ; 
  t, 
  testis. 
  Magnified 
  30 
  diameters. 
  

  

  ,, 
  6. 
  Section 
  of 
  the 
  same 
  Sylon 
  as 
  in 
  the 
  two 
  foregoing 
  figures 
  ; 
  e, 
  t, 
  as 
  in 
  fig. 
  5 
  ; 
  

   t', 
  communication 
  of 
  the 
  interior 
  of 
  the 
  testis 
  with 
  the 
  mantle-cavity. 
  

   Magnified 
  41 
  diameters. 
  

  

  