﻿548 
  PROCEEDIXGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.xx. 
  

  

  Jlistomum 
  rachioii 
  C'obbold, 
  from 
  Gadiis 
  calhirias. 
  

  

  Fig. 
  3. 
  Veutr;il 
  view 
  of 
  specimeu. 
  Eularged 
  tweuty-seven 
  times. 
  

  

  4. 
  Scjuamose 
  spines 
  of 
  neck. 
  Enlarjied 
  two 
  hundred 
  and 
  twenty-five 
  times. 
  

  

  5. 
  Outline 
  of 
  margin 
  of 
  neck. 
  Enlarged 
  two 
  hundred 
  and 
  twenty-live 
  times. 
  

  

  6. 
  Margin 
  of 
  body 
  near 
  posterior 
  end. 
  Enlarged 
  two 
  hundred 
  and 
  twenty-five 
  

  

  times. 
  

  

  7. 
  Ovum. 
  Enlarged 
  two 
  htmdred 
  and 
  twenty-five 
  times. 
  

  

  Dist07nuiii 
  daratum 
  Kudoljjhi, 
  from 
  Xiphias 
  ffladius. 
  

  

  8. 
  Transverse 
  section 
  of 
  body 
  through 
  anterior 
  edge 
  of 
  pharynx, 
  x. 
  sections 
  of 
  

  

  vessels, 
  which 
  at 
  this 
  level 
  have 
  the 
  same 
  structure 
  as 
  the 
  vessels 
  i. 
  i., 
  

   shown 
  in 
  the 
  two 
  succeeding 
  figures 
  to 
  be 
  the 
  intestinal 
  cruri. 
  n. 
  n, 
  nerves? 
  

   Zeiss 
  2/ 
  A, 
  draw-tube 
  closed. 
  

  

  9. 
  Transverse 
  section 
  through 
  middle 
  of 
  pharynx 
  showing 
  the 
  anteriorly 
  

  

  extending 
  a'sophagus 
  in 
  communication 
  with 
  the 
  intestinal 
  cruri. 
  u. 
  n. 
  

   nerves? 
  Zeiss 
  2/A, 
  draw-tube 
  closed. 
  

  

  10. 
  Transverse 
  section 
  through 
  the 
  posterior 
  edge 
  of 
  the 
  pharynx, 
  showing 
  the 
  

  

  communication 
  of 
  the 
  (I'sophagus 
  with 
  the 
  pharynx, 
  n. 
  u. 
  nerves? 
  Zeiss 
  

   2/A, 
  draw 
  tube 
  closed. 
  

  

  11. 
  Ova. 
  Enlarged 
  three 
  hundred 
  and 
  seventy-five 
  times. 
  

  

  Distomum 
  species, 
  larva 
  encysted 
  in 
  Stizostedion 
  canadense. 
  

  

  12. 
  Longitudinal 
  vertical 
  section, 
  /irf 
  nutrient 
  duct. 
  Zeiss 
  2/A, 
  draw-tube 
  open. 
  

  

  13. 
  Longitudinal 
  vertical 
  section 
  of 
  posterior 
  end 
  through 
  external 
  aperture 
  of 
  

  

  the 
  nutrient 
  duct 
  {nd). 
  Zeiss 
  2/A, 
  draw- 
  tube 
  open. 
  

  

  Plate 
  LIV. 
  Distomum 
  species. 
  

  

  Fig. 
  1. 
  Section 
  of 
  cyst 
  with 
  contained 
  embryo 
  through 
  communication 
  of 
  nutrient 
  

   duct 
  with 
  surrounding 
  food 
  material. 
  Zeiss 
  2/A, 
  draw-tube 
  open. 
  cy. 
  con- 
  

   nective 
  tissue 
  cyst. 
  gr. 
  granular 
  nutritive 
  parenchymatose 
  layer, 
  np. 
  

   nutritive 
  pore 
  of 
  embryo. 
  

  

  Monostomum 
  orbiculare 
  Rudolphi, 
  from 
  Lobotes 
  surinamensiii. 
  

  

  2. 
  Ventral 
  view. 
  Sketched 
  from 
  living 
  specimeu 
  by 
  Margaret 
  B. 
  Linton. 
  En- 
  

  

  larged 
  forty-five 
  times. 
  

  

  3. 
  Ventral 
  view 
  of 
  another 
  specimen 
  in 
  oil 
  of 
  cloves. 
  Zeiss 
  2/A, 
  draw-tube 
  

  

  closed. 
  

  

  4. 
  Transverse 
  section 
  of 
  body 
  near 
  posterior 
  end. 
  Zeiss 
  2/A, 
  draw-tube 
  open. 
  

  

  5. 
  Ova. 
  Zeiss 
  4/D, 
  draw-tube 
  open. 
  

  

  