﻿454 
  PllOCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  Sohistocephalua 
  dimorphua 
  Creplin 
  (?), 
  from 
  Cottus 
  iairdii. 
  

  

  Fig. 
  4. 
  Head 
  and 
  interior 
  segments. 
  Lularged 
  fifteen 
  times. 
  

  

  5. 
  Part 
  of 
  transverse 
  section 
  of 
  body, 
  »i. 
  nerve, 
  Jm. 
  small 
  longitudinal 
  muscle 
  

  

  bundles, 
  ///(.large 
  longitudinal. 
  Zeiss 
  2/A, 
  draw-tube 
  open. 
  

  

  Cyathocephalus 
  truncatus 
  Pallas, 
  from 
  Coregouns 
  chipeifonnis. 
  

  

  6. 
  Ventral 
  view 
  of 
  specimen. 
  Enlarged 
  six 
  times. 
  

  

  7. 
  Head 
  of 
  same. 
  Enlarged 
  thirty 
  times. 
  

  

  8. 
  Head 
  of 
  another 
  specimen. 
  Enlarged 
  thirty 
  times. 
  

  

  Dibotltrlinn 
  riKjosum 
  Rudolphi, 
  from 
  Gadiix 
  callarias. 
  

  

  9. 
  Posterior 
  segment, 
  abnormal. 
  Enlarged 
  about 
  fourteen 
  times. 
  

  

  10. 
  Longitudinal 
  horizontal 
  section, 
  Iv. 
  excretory 
  vessel. 
  Zeiss 
  2/A, 
  draw-tube 
  

   closed. 
  

  

  Plate 
  XXIX. 
  

  

  IHhothrinm 
  rugosum 
  Rudolphi 
  (continued). 
  

  

  Fig. 
  1. 
  Longitudinal 
  vertical 
  section. 
  Zeiss 
  2/A, 
  draw-tul»e 
  closed. 
  

  

  2. 
  Same, 
  more 
  highly 
  magnitied, 
  showing 
  cross 
  section 
  of 
  cirrus-pouch 
  and 
  

  

  vagina. 
  Zeiss 
  2/D, 
  draw-tube 
  open. 
  

  

  3. 
  Part 
  of 
  transverse 
  section 
  of 
  body 
  through 
  the 
  laterally 
  placed 
  cirrus-pouch. 
  

  

  Zeiss 
  2/A. 
  draw-tube 
  closed. 
  

  

  4. 
  Part 
  of 
  longitudinal 
  vertical 
  section 
  of 
  body 
  throiigh 
  the 
  external 
  orifices 
  

  

  of 
  uteri. 
  Zeiss 
  2/A, 
  draw-tube 
  closed. 
  

  

  Dlbotlifiiim 
  hantatnm, 
  new 
  species, 
  from 
  Pohjodon 
  spathula. 
  

  

  5. 
  Lateral 
  view 
  of 
  head, 
  sketch 
  from 
  life. 
  Enlarged 
  fifteen 
  times. 
  

  

  6. 
  Marginal 
  view 
  of 
  same, 
  from 
  life. 
  Enlarged 
  fifteen 
  times. 
  

  

  7. 
  Antero-median 
  segments, 
  from 
  life, 
  enlarged 
  about 
  three 
  times. 
  

  

  8. 
  Median 
  segments, 
  from 
  life. 
  Enlarged 
  about 
  three 
  times. 
  

  

  9. 
  Posterior 
  segments. 
  Enlarged 
  four 
  times. 
  

  

  10. 
  Same 
  of 
  another 
  strobile. 
  Enlarged 
  four 
  times. 
  

  

  11. 
  Optical 
  section 
  of 
  lateral 
  genital 
  aperture, 
  in 
  oil 
  of 
  cloves. 
  Enlarged 
  one 
  

  

  hundred 
  and 
  eighty 
  times. 
  

  

  Plate 
  XXX. 
  

  

  Dibothriitm 
  hastatum, 
  new 
  species 
  (continued). 
  

  

  Fig. 
  1. 
  Lateral 
  view 
  of 
  head 
  of 
  living 
  specimen. 
  Enlarged 
  thirty 
  times. 
  

  

  2. 
  Marginal 
  view 
  of 
  head 
  of 
  living 
  specimen. 
  Enlarged 
  twenty-five 
  times. 
  

  

  Dihotlirium 
  InfnndlbnViforme 
  Rudolphi, 
  from 
  Lota 
  matuJona 
  and 
  Salvelinus 
  

   iiamaycui^h. 
  

  

  3. 
  Head 
  of 
  specimen 
  from 
  L. 
  inactiloso. 
  Zeiss 
  2/A, 
  draw-tube 
  closed. 
  

  

  4. 
  Head 
  of 
  another 
  specimen 
  from 
  same 
  host. 
  Zeiss 
  2/A, 
  draw-tube 
  closed. 
  

  

  5. 
  Head 
  of 
  specimen 
  of 
  6'. 
  vamaycusli. 
  Enlarged 
  fifteen 
  times. 
  

  

  6. 
  Another 
  type 
  of 
  head 
  from 
  same 
  host. 
  Enlarged 
  fifteen 
  times. 
  

  

  Dibothrium 
  laciniutitm, 
  new 
  species, 
  from 
  Tarpon 
  atlanticus. 
  

  

  7. 
  Head 
  and 
  anterior 
  segments. 
  Enlarged 
  twelve 
  times. 
  

  

  8. 
  Same 
  specimen, 
  lateral 
  view. 
  Enlarged 
  twelve 
  times. 
  

  

  9. 
  Another 
  specimen, 
  marginal 
  view, 
  corresponding 
  to 
  lateral 
  margin 
  of 
  body. 
  

  

  Enlarged 
  twelve 
  times. 
  

  

  10. 
  Lateral 
  view 
  of 
  same 
  specimen. 
  Enlarged 
  twelve 
  times. 
  

  

  11. 
  Front 
  view 
  of 
  head. 
  Enlarged 
  twelve 
  times. 
  

  

  12. 
  Antero-median 
  segments. 
  Enlarged 
  twelve 
  times. 
  

  

  