﻿530 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MTSEUM. 
  

  

  Testes 
  two, 
  close 
  together, 
  one 
  following 
  the 
  other, 
  just 
  back 
  of 
  the 
  

   constriction 
  of 
  the 
  body 
  behind 
  the 
  ventral 
  sucker. 
  In 
  the 
  specimen 
  

   sectioned 
  they 
  lay 
  somewhat 
  toward 
  the 
  left 
  .side. 
  The 
  ovary 
  follows 
  

   the 
  posterior 
  testis 
  closely, 
  lies 
  rather 
  more 
  toward 
  the 
  right 
  side 
  of 
  

   the 
  body 
  tlian 
  the 
  testes 
  and 
  dorsal. 
  The 
  shell 
  gland 
  is 
  on 
  its 
  anterior 
  

   border. 
  The 
  vitellaria 
  are 
  not 
  very 
  abundant 
  in 
  this 
  (mature) 
  speci- 
  

   men. 
  They 
  are 
  for 
  the 
  most 
  part 
  lateral 
  and 
  dorsal, 
  but 
  are 
  also 
  scat- 
  

   tered 
  among 
  the 
  folds 
  of 
  the 
  uterus, 
  from 
  the 
  vicinity 
  of 
  the 
  testes 
  to, 
  

   near 
  the 
  posterior 
  end. 
  In 
  younger 
  stages 
  of 
  the 
  worm 
  these 
  glands 
  

   are 
  probably 
  very 
  voluminous. 
  They 
  are 
  reddish-brown 
  in 
  carmine- 
  

   stained 
  sections. 
  The 
  anterior 
  tube 
  of 
  the 
  uterus 
  lies 
  on 
  the 
  ventral 
  

   side 
  of 
  the 
  neck 
  and 
  joins 
  the 
  cirrus 
  at 
  its 
  base. 
  The 
  vas 
  deferens 
  is 
  

   very 
  voluminous. 
  Its 
  convolutions 
  lie 
  dorsally 
  and 
  extend 
  from 
  the 
  

   middle 
  of 
  the 
  neck 
  to 
  near 
  its 
  base. 
  The 
  seminal 
  receptacle 
  is 
  also 
  

   very 
  voluminous, 
  lying 
  at 
  the 
  base 
  of 
  the 
  neck, 
  and 
  dorsal 
  to 
  the 
  ven- 
  

   tral 
  sucker. 
  The 
  intestinal 
  crura 
  are 
  very 
  distinct, 
  thick 
  walled, 
  and 
  

   extend 
  to 
  near 
  the 
  posterior 
  end 
  of 
  the 
  body. 
  The 
  excretory 
  vessels 
  

   (Fig. 
  7) 
  were 
  seen 
  only 
  near 
  the 
  posterior 
  eud 
  of 
  the 
  body, 
  the 
  two 
  

   uniting 
  in 
  a 
  single 
  vessel, 
  which 
  lies 
  between 
  the 
  terminal 
  portions 
  of 
  

   the 
  intestinal 
  crura 
  and 
  ends 
  in 
  a 
  terminal 
  i)ore. 
  The 
  uterus, 
  filled 
  

   with 
  ova, 
  occupies 
  the 
  greater 
  part 
  of 
  the 
  body 
  back 
  of 
  the 
  ovary. 
  

  

  The 
  musculature 
  of 
  the 
  ventral 
  body-wall 
  back 
  of 
  the 
  ventral 
  sucker 
  

   is 
  very 
  strongly 
  developed. 
  

  

  23. 
  DISTOMUM 
  NIGROFLAVUM 
  Rudolphi. 
  

   (Plates 
  XLVIII, 
  figs. 
  8-11 
  ; 
  XLIX, 
  tigs. 
  1, 
  2. 
  ) 
  

  

  Distomiim 
  nigroHarnm 
  Dtjaudin, 
  Hist. 
  Nat. 
  d. 
  Hehii., 
  184.5, 
  p. 
  469. 
  — 
  Diksixg, 
  

   Syst. 
  Helm., 
  T, 
  1850, 
  p. 
  394 
  ; 
  Sitzmigsb. 
  Wiener 
  Akad., 
  XXXII, 
  1858, 
  p. 
  353.— 
  

   CoBBOLi), 
  Syuops. 
  Distoin., 
  1859, 
  p. 
  29. 
  — 
  Olsson, 
  Lniid's 
  Univ. 
  Arsskiift, 
  

   IV, 
  p. 
  25, 
  pi. 
  y, 
  figs. 
  102, 
  103.— 
  Cakus, 
  Prodr. 
  Fauna- 
  Mrditcir., 
  T, 
  1884, 
  p. 
  

   126. 
  — 
  Stossicii, 
  Dist. 
  d. 
  Pesc, 
  1886, 
  p. 
  40. 
  — 
  Sqnsino, 
  Notizio 
  di 
  trcniatodi. 
  

   Estr. 
  d. 
  Proc. 
  Verb. 
  8oo. 
  Tosc. 
  Sci. 
  Nat., 
  1890, 
  p. 
  4. 
  

  

  In 
  a 
  lot 
  of 
  Distoma 
  (No. 
  4857, 
  U.S.N.M.) 
  from 
  the 
  intestine 
  of 
  the 
  

   sunlish 
  (Kola 
  moJa) 
  I 
  find 
  three 
  distinct 
  kinds, 
  wliich 
  I 
  have 
  referred 
  

   to 
  the 
  following 
  species: 
  />. 
  uigrojiavrDu 
  IJudolphi, 
  T). 
  macrocofi/le 
  

   Diesiug, 
  and 
  I), 
  foliafum 
  mihi. 
  I 
  have 
  not 
  had 
  an 
  opportunity 
  of 
  

   studying 
  specimens 
  in 
  life, 
  and 
  therefore 
  do 
  not 
  know 
  what 
  difference 
  

   may 
  exist 
  in 
  the 
  living 
  specimens. 
  The 
  alcoholic 
  specimens 
  possess 
  a 
  

   general 
  superficial 
  likeness, 
  especially 
  />. 
  nigrofJartim 
  and 
  T),folintH)ii: 
  

   but 
  while 
  there 
  is 
  a 
  very 
  considerable 
  variation 
  of 
  size 
  and 
  shaj^e, 
  the 
  

   three 
  species 
  stand 
  stifHy 
  apart 
  from 
  each 
  other. 
  

  

  Body 
  cylindrical, 
  linear, 
  often 
  much 
  contorted 
  in 
  a 
  dorso-ventral 
  

   plane; 
  neck 
  short, 
  cylindrical, 
  usually 
  reflected 
  dorsally. 
  Mouth 
  ter- 
  

   minal. 
  Ventral 
  sucker 
  larger 
  than 
  oral, 
  pedicellate; 
  the 
  pedicel 
  some- 
  

   times 
  narrow 
  and 
  contracted, 
  sometimes 
  swollen 
  and 
  containing 
  folds 
  of 
  

   the 
  uterus. 
  Reproductive 
  aperture 
  about 
  middle 
  of 
  under 
  side 
  of 
  neck; 
  

   cirrus, 
  everted 
  in 
  several 
  cases, 
  rather 
  stout 
  with 
  a 
  swollen 
  base. 
  The 
  

  

  