﻿NO. 
  1133. 
  TREMATODE 
  PABASITES 
  OF 
  FISHES— 
  LIXTOX. 
  521 
  

  

  diameter 
  of 
  ventral 
  sucker, 
  0.60; 
  long- 
  diameter 
  of 
  ova, 
  0.017; 
  short 
  

   diameter 
  of 
  ova, 
  .0.009. 
  

  

  Found 
  ill 
  stomacli 
  of 
  AnffuilJa 
  ehrysyjm 
  ; 
  Woods 
  Holl, 
  Massachusetts, 
  

   September 
  2, 
  1885. 
  

  

  14. 
  DISTOMUM 
  AURICULATUM 
  Wedl 
  (.'). 
  

  

  (Plate 
  XLV, 
  figs. 
  1-7.) 
  

   TUstominn 
  ainicidalum 
  Wedl, 
  Sitzuugsb. 
  cl. 
  Kais. 
  Akad., 
  XXVI, 
  1857, 
  p. 
  242, 
  Pt. 
  

   4, 
  pi. 
  I, 
  fig. 
  2. 
  — 
  DiEsixG, 
  Revis. 
  d. 
  Mvzhelm, 
  p. 
  343. 
  — 
  Stossich, 
  Dist. 
  d. 
  

   Pesc, 
  p. 
  18. 
  

  

  1 
  refer 
  these 
  Distoma 
  provisionally 
  to 
  D. 
  anricidatum. 
  

  

  Body 
  short, 
  linear 
  or 
  lance-linear, 
  flattened; 
  posteriorly 
  subattenu- 
  

   ate, 
  anteriorly 
  broadly 
  rounded; 
  mouth 
  subterminal, 
  large, 
  overlapped 
  

   in 
  front 
  by 
  two 
  auricular 
  flaps 
  symmetrically 
  placed 
  and 
  each 
  prolonged 
  

   laterally 
  like 
  a 
  conical 
  papilla; 
  four 
  other 
  papilhe 
  on 
  head, 
  one 
  on 
  each 
  

   side 
  and 
  two 
  dorso 
  lateral, 
  making, 
  with 
  the 
  tips 
  of 
  the 
  auricular 
  flaps, 
  

   six 
  wartlike 
  papilhe 
  in 
  all. 
  Ventral 
  sucker 
  about 
  central, 
  smaller 
  than 
  

   the 
  oral 
  sucker. 
  CEsophagus 
  none, 
  pharynx 
  ellipsoidal. 
  Vitellaria 
  

   voluminous, 
  mainly 
  lateral, 
  extending 
  from 
  i)Osterior 
  end 
  on 
  each 
  side 
  

   nearly 
  to 
  the 
  head. 
  Ova 
  rather 
  large 
  in 
  a 
  mass 
  behind 
  ventral 
  sucker. 
  

   Testes 
  about 
  midway 
  between 
  posterior 
  edge 
  of 
  ventral 
  sucker 
  and 
  

   posterior 
  end 
  of 
  body. 
  Cirrus 
  i^ouch 
  in 
  front 
  of 
  ventral 
  sucker, 
  repro- 
  

   ductive 
  aperture 
  halfway 
  between 
  suckers. 
  The 
  five 
  specimens 
  were 
  

   2,20, 
  1.01, 
  1.00, 
  and 
  1,70 
  mm., 
  respectively, 
  in 
  length. 
  

  

  The 
  dimensions 
  of 
  the 
  larger 
  specimen 
  are 
  here 
  given: 
  Length, 
  

   2.2 
  mm.; 
  breadth 
  of 
  head, 
  0.5; 
  breadth 
  of 
  neck, 
  0.41; 
  breadth 
  of 
  body, 
  

   0.0; 
  longitudinal 
  diameter 
  of 
  oral 
  sucker, 
  0.42; 
  transverse 
  diameter 
  of 
  

   the 
  same, 
  0.4(5; 
  longitudinal 
  diameter 
  of 
  ventral 
  sucker, 
  0.28; 
  trans- 
  

   verse 
  diameter 
  of 
  same, 
  0.32; 
  length 
  of 
  pharynx, 
  0.16; 
  diameter 
  of 
  

   pharynx, 
  0.11. 
  Ova, 
  0.07 
  and 
  0.01 
  mm. 
  in 
  two 
  i)rincipal 
  diameters. 
  

  

  The 
  apertures 
  of 
  the 
  oral 
  and 
  ventral 
  suckers 
  in 
  these 
  (alcoholic) 
  

   specimens 
  are 
  subcireular. 
  

  

  The 
  ovary 
  is 
  situated 
  on 
  tiie 
  right 
  side 
  and 
  a 
  little 
  way 
  back 
  of 
  the 
  

   ventral 
  sucker. 
  The 
  intestinal 
  crura 
  are 
  rather 
  small. 
  The 
  excretory 
  

   vessel 
  was 
  first 
  seen 
  in 
  serial 
  sections 
  as 
  a 
  single, 
  dorsal, 
  thin-walled 
  

   vessel 
  in 
  the 
  vicinity 
  of 
  the 
  testes 
  (Fig. 
  5). 
  Behind 
  the 
  termination 
  

   of 
  the 
  intestinal 
  crura 
  its 
  walls 
  become 
  a 
  little 
  thicker 
  and 
  somewhat 
  

   folded 
  (Fig. 
  0). 
  At 
  the 
  terminal 
  pore 
  the 
  walls 
  are 
  thick 
  and 
  globu- 
  

   lar 
  (Fig. 
  7). 
  

  

  Five 
  specimens 
  (Xo. 
  4845, 
  U.S.N.M.) 
  from 
  intestine 
  of 
  the 
  lake 
  

   sturgeon 
  {Acipenser 
  rubicundus) 
  ; 
  J. 
  W. 
  Milner, 
  collector. 
  

  

  15. 
  DISTOMUM 
  VELIPORUM 
  Creplin 
  (?). 
  

  

  Distomum 
  reUponim 
  DiESiNG, 
  Syst. 
  Helm., 
  I, 
  p. 
  347. 
  — 
  Olssox, 
  Limd's 
  Univ. 
  

   Arsskrift, 
  IV, 
  pp. 
  22-24; 
  Bidrag., 
  p. 
  13. 
  

   One 
  specimen, 
  a 
  fragment, 
  the 
  posterior 
  part 
  of 
  a 
  distomum 
  broken 
  

   in 
  two 
  immediatelj^ 
  in 
  front 
  of 
  ventral 
  sucker, 
  agrees 
  pretty 
  well 
  with 
  

  

  