﻿NO. 
  1125. 
  CESTOBE 
  PARASITES 
  OF 
  FISHES— 
  LINTOX. 
  431 
  

  

  where 
  the 
  head 
  aud 
  anterior 
  portion 
  of 
  the 
  body 
  become 
  imbedded 
  in 
  

   the 
  intestinal 
  \Yalls, 
  it 
  is 
  altogether 
  probable 
  that 
  this 
  specimen 
  had 
  a 
  

   like 
  position. 
  

  

  10. 
  DIBOTHRIUM 
  RUGOSUM 
  Rudolphi. 
  

   (Plates 
  XXVIII, 
  figs. 
  9-10; 
  XXIX, 
  figs. 
  1-4.) 
  

  

  Dibotlirium 
  rugosum 
  Rtdolphi, 
  U. 
  S. 
  Fish 
  Com. 
  Eept., 
  1887, 
  pp. 
  750-7.54, 
  pi. 
  iii, 
  

   figs. 
  7-10. 
  

  

  Nos. 
  4712, 
  472G, 
  4728, 
  IJ.S.X.M. 
  Ten 
  lots 
  of 
  this 
  species 
  all 
  from 
  the 
  

   intestine 
  of 
  the 
  cod 
  {Gadus 
  callarias): 
  

  

  1. 
  Intestine 
  of 
  cod, 
  Woods 
  Holl, 
  Massachnsetts^y^^. 
  jST. 
  Edwards, 
  col- 
  

   lector; 
  Decembers, 
  1887. 
  Several 
  specimens, 
  two'with 
  heads 
  imbedded 
  

   in 
  iiyloric 
  coeca. 
  Largest 
  188 
  mm. 
  in 
  length, 
  3G 
  of 
  whicU, 
  imbedded; 
  

   tissne 
  degenerate 
  surrounded 
  by 
  waxy 
  secretion. 
  I>J^!||^« 
  "early 
  uni- 
  

   form 
  size, 
  3 
  mm. 
  broad 
  and 
  1 
  thick; 
  length 
  of 
  segi|Kwpiear 
  posterior 
  

   end 
  O.G. 
  % 
  

  

  2. 
  Same 
  as 
  Xo. 
  1 
  ; 
  December 
  10, 
  1887. 
  Four 
  fragments. 
  

  

  3. 
  Same 
  as 
  No. 
  1; 
  November 
  28, 
  1887. 
  One 
  specimen 
  36 
  mm. 
  long, 
  

   1.5 
  broad; 
  anterior 
  end 
  impacted 
  in 
  pyloric 
  ccecum 
  and 
  surrounded 
  

   with 
  waxy 
  secretion. 
  

  

  4. 
  Same 
  as 
  No. 
  1; 
  January 
  4, 
  1888. 
  Fragments, 
  largest 
  212 
  mm. 
  

   long 
  and' 
  3.5 
  broad; 
  some 
  slender 
  fragments, 
  one 
  70 
  long 
  and 
  1.5 
  broad, 
  

   tapering 
  anteriorly; 
  no 
  scolices. 
  

  

  5. 
  Same 
  as 
  No. 
  1; 
  November 
  28, 
  1887. 
  Several 
  specimens 
  with 
  

   heads 
  impacted 
  in 
  pyloric 
  cceca. 
  Largest 
  specimen 
  250 
  mm. 
  long 
  and 
  

   4.75 
  broad; 
  some 
  slender 
  forms, 
  one 
  1G5 
  long 
  and 
  2 
  broad; 
  heads 
  of 
  all 
  

   degenerate. 
  

  

  G. 
  Same 
  as 
  No. 
  1 
  ; 
  November 
  25, 
  1887. 
  One 
  small 
  fragment. 
  

  

  7. 
  Same 
  as 
  No. 
  1 
  ; 
  January 
  20, 
  1888. 
  Two 
  fragments. 
  The 
  posterior 
  

   segment 
  of 
  one 
  was 
  exceptional 
  in 
  having 
  the 
  posterolateral 
  angles 
  

   IH'ojecting 
  in 
  curved 
  processes 
  (Plate 
  XXVIII, 
  fig. 
  9), 
  

  

  8. 
  Same 
  as 
  No. 
  1; 
  November 
  14, 
  1887. 
  Six 
  fragments 
  ; 
  largest 
  72 
  mm. 
  

   long 
  and 
  2 
  broad. 
  

  

  9. 
  Same 
  as 
  No. 
  1; 
  December 
  24, 
  1887. 
  Three 
  specimens; 
  longest 
  

   215 
  mm., 
  slender, 
  head 
  very 
  little 
  degenerated, 
  as 
  is 
  usually 
  the 
  case 
  on 
  

   account 
  of 
  habit 
  of 
  worm 
  to 
  become 
  impacted 
  in 
  pyloric 
  coeca 
  of 
  host. 
  

  

  10. 
  Same 
  as 
  No. 
  1 
  ; 
  November 
  26, 
  1887. 
  Four 
  fragments. 
  

  

  All 
  the 
  above 
  specimens 
  collected 
  at 
  Woods 
  Holl, 
  Massachusetts, 
  by 
  

   Mr. 
  V. 
  N. 
  Edwards. 
  

  

  Some 
  portion 
  of 
  the 
  anatomy 
  of 
  this 
  species 
  is 
  shown 
  in 
  Plate 
  

   XXVIII, 
  fig. 
  10; 
  Plate 
  XXIX, 
  figs. 
  1-4. 
  

  

  11. 
  DIBOTHRIUM 
  HASTATUM, 
  new 
  species. 
  

   (Plates 
  XXIX, 
  figs. 
  5-11; 
  XXX, 
  figs. 
  1,2.) 
  

  

  Types.— 
  Nos. 
  4724, 
  4783, 
  U.S.N.M. 
  From 
  intestine 
  of 
  paddlefish 
  

   {Polyodon 
  spathula). 
  The 
  fish 
  from 
  which 
  these 
  worms 
  were 
  taken 
  was 
  

   caught 
  in 
  the 
  Ohio 
  Eiver, 
  near 
  Bellaire, 
  Ohio, 
  about 
  March 
  13, 
  1889. 
  

  

  