﻿456 
  rPOCEEDIXGS 
  of 
  the 
  national 
  museum. 
  vol. 
  XX. 
  

  

  Rhinehothrinm 
  ininimiim 
  Beueden, 
  from 
  Raja 
  hnvia. 
  

   Fig. 
  5. 
  Head, 
  bothria 
  somewluit 
  distorted. 
  P^nlarged 
  about 
  fourteen 
  times. 
  

   riinllobotliriitin 
  foliatiim 
  Liuton, 
  from 
  J>asi/aliK 
  cmtrura. 
  

  

  6. 
  Free 
  proglottis. 
  Enlarged 
  about 
  forty 
  times. 
  

  

  Orygmatohothriiim 
  paulum, 
  new 
  species, 
  from 
  Galeocerdo 
  tup-inus. 
  

  

  7. 
  Front 
  view 
  of 
  head. 
  Zeiss 
  2/A, 
  draw-tube 
  open. 
  

  

  8. 
  Single 
  bothrium, 
  front 
  view. 
  Zeiss 
  2/D, 
  draw-tube 
  closed. 
  

  

  Orygmatohothriiim 
  creniilatiim, 
  new 
  species, 
  from 
  Dasyatis 
  centritra. 
  

  

  9. 
  Front 
  view 
  of 
  head. 
  Zeiss 
  2/A, 
  draw-tube 
  open. 
  

  

  10. 
  Single 
  lobe 
  of 
  same; 
  as, 
  anterior 
  sucker; 
  jjs, 
  posterior 
  sucker; 
  cm, 
  circular 
  

  

  muscles. 
  Zeiss 
  2/A, 
  draw-tube 
  open. 
  

  

  11. 
  Single 
  lobe, 
  diagrammatic, 
  letters 
  same 
  as 
  in 
  fig. 
  10. 
  

  

  12. 
  Posterior 
  segments. 
  Zeiss 
  2/A, 
  draw-tube 
  closed. 
  

  

  Plate 
  XXXIV. 
  

  

  Orygmatohothrium 
  creniilatiim, 
  new 
  species 
  (continued). 
  

  

  Fig. 
  1. 
  Part 
  of 
  longitudinal 
  section 
  of 
  head; 
  letters 
  same 
  as 
  in 
  Plate 
  XXXIII, 
  

   fig. 
  10, 
  highly 
  magnified. 
  

  

  Oncliohotliriiim 
  uncinatiim 
  Diesing, 
  from 
  Dasyatin 
  centrura. 
  

  

  2. 
  Side 
  view 
  of 
  head. 
  Enlarged 
  twenty-four 
  times. 
  

  

  3. 
  Hooks 
  as 
  seen 
  in 
  front 
  view 
  of 
  head; 
  ti, 
  tubercle. 
  Enlarged 
  about 
  one 
  hun- 
  

  

  dred 
  and 
  eighty 
  times. 
  

  

  4. 
  Broken 
  hooks; 
  /(, 
  base 
  of 
  hooks; 
  th, 
  base 
  of 
  tubercle. 
  Enlarged 
  about 
  one 
  

  

  hundred 
  and 
  eighty 
  times. 
  

  

  5. 
  Side 
  view 
  of 
  hook; 
  th, 
  tubercle. 
  Enlarged 
  about 
  one 
  hundred 
  and 
  eighty 
  

  

  times. 
  

  

  CalUohothrhivi 
  rerticillatum 
  Rudoljjhi, 
  from 
  Miistehts 
  canis. 
  

  

  6. 
  Masses 
  of 
  ova 
  in 
  oviduct, 
  from 
  life. 
  Enlarged 
  about 
  sixty 
  times. 
  

  

  7. 
  Single 
  mass 
  of 
  ova, 
  from 
  life. 
  Enlarged 
  about 
  two 
  hundred 
  and 
  twenty- 
  

  

  five 
  times. 
  

  

  Rh 
  ymhohotJiriuyn 
  teiiuispinc 
  Linton, 
  from 
  Dasyatis 
  centrura. 
  

  

  8. 
  Free, 
  mature 
  segment; 
  cl, 
  genital 
  cloaca; 
  sr, 
  seminal 
  receptacle. 
  Enlarged 
  

  

  about 
  twenty 
  times. 
  

  

  Hhynchohothriiim 
  hrerisjnne, 
  new 
  species, 
  from 
  small 
  ray 
  (Rhiiioptera 
  hoiiasiis)^ 
  

  

  9. 
  Head 
  and 
  neck, 
  proboscides 
  extended. 
  Enlarged 
  about 
  twenty-two 
  times. 
  

  

  10. 
  Proboscis 
  near 
  base. 
  Enlarged 
  about 
  four 
  hundred 
  and 
  seventy-five 
  times. 
  

  

  11. 
  Another 
  view 
  of 
  proboscis, 
  near 
  base. 
  Enlarged 
  about 
  four 
  hundred 
  and 
  

  

  seventy-five 
  times. 
  

  

  Rhyiichobothrium 
  ague, 
  new 
  species, 
  from 
  Rhiiioptera 
  bonasiis. 
  

  

  12. 
  Head 
  and 
  neck, 
  showing 
  proboscides, 
  sheaths, 
  and 
  bulbs. 
  Zeiss 
  2/A, 
  draw- 
  

  

  tube 
  (dosed. 
  

  

  13. 
  Portion 
  of 
  strobile. 
  Enlarged 
  about 
  fifteen 
  times. 
  

  

  14. 
  Proboscis, 
  near 
  apex. 
  Zeiss 
  2/D, 
  draw-tube 
  open. 
  The 
  hooks 
  are 
  larger 
  ou 
  

  

  the 
  opposite 
  side 
  of 
  the 
  proboscis. 
  

  

  15. 
  Proboscis, 
  near 
  base. 
  Zeiss 
  2D, 
  draw-tube 
  open. 
  The 
  hooks 
  are 
  smaller 
  

  

  on 
  the 
  opposite 
  side 
  of 
  the 
  proboscis. 
  

  

  