﻿520 
  PliOCEEDIXGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.xx. 
  

  

  mill.; 
  distance 
  between 
  suckers,! 
  mm.; 
  diameter 
  of 
  pharynx, 
  0.1 
  mm.; 
  

   maximum 
  diameter 
  of 
  body, 
  O.TS^inm. 
  

  

  In 
  a 
  living' 
  specimeu, 
  dorsal 
  view, 
  a 
  small 
  organ 
  just 
  behind 
  the 
  

   ovary 
  was 
  seen, 
  in 
  which 
  there 
  was 
  active 
  ciliary 
  motion. 
  The 
  position 
  

   of 
  the 
  organ 
  would 
  indicate 
  that 
  it 
  is 
  the 
  shell 
  gland. 
  

  

  The 
  si)ecimens 
  were 
  found 
  in 
  the 
  stomach 
  of 
  their 
  host 
  in 
  each 
  case. 
  

   In 
  one 
  instance 
  a 
  few 
  specimens 
  were 
  also 
  found 
  in 
  the 
  gills 
  of 
  their 
  

   host. 
  

  

  While 
  the 
  worms 
  were 
  active 
  the 
  jiharynx 
  could 
  be 
  seen 
  expanding 
  

   and 
  contracting 
  almost 
  rhythmically 
  and 
  tlie 
  fluid 
  contents 
  of 
  the 
  two 
  

   branches 
  of 
  the 
  alimentary 
  tract 
  was 
  kept 
  in 
  motion 
  l)y 
  a 
  kind 
  of 
  peri- 
  

   staltic 
  action 
  of 
  their 
  walls. 
  

  

  13. 
  DISTOMUM 
  GRANDIPORUM 
  Rudolphi. 
  

   (Plate 
  X 
  LI 
  V, 
  fig. 
  9.) 
  

  

  Distommn 
  f/randiporum 
  Diesixg, 
  Syst. 
  Helm., 
  I, 
  1850, 
  p. 
  371. 
  — 
  MoLix, 
  Sitzniigsb. 
  

   Wiener 
  Akad., 
  XXXVII, 
  l<sr)9, 
  p. 
  826, 
  pi. 
  ii, 
  Hg. 
  .5. 
  — 
  Cobbold, 
  Synops. 
  Distom., 
  

   1859, 
  p. 
  23.— 
  Olssox, 
  Bidrag 
  t. 
  Skaud. 
  Helmiuthf., 
  1876, 
  p. 
  20.— 
  Stossich, 
  

   Dist. 
  d. 
  Pesc, 
  1886, 
  p. 
  11. 
  

  

  I 
  refer 
  to 
  this 
  species 
  a 
  single 
  specimen 
  (Xo. 
  5505, 
  U.S.X.M. 
  ) 
  from 
  

   the 
  stomach 
  of 
  the 
  common 
  eel 
  

  

  The 
  specimen 
  is 
  adult, 
  and 
  the 
  very 
  voluminous 
  folds 
  of 
  the 
  uterus 
  

   are 
  so 
  crowded 
  with 
  ova 
  that 
  the 
  other 
  organs 
  are 
  thereby 
  to 
  a 
  great 
  

   extent 
  obscured. 
  Fig. 
  9 
  is 
  from 
  a 
  sketch 
  of 
  the 
  specimeu 
  much 
  dis- 
  

   torted 
  by 
  compression. 
  

  

  The 
  following 
  synopsis 
  of 
  the 
  species 
  is 
  compiled 
  from 
  the 
  sjmopses 
  

   as 
  given 
  by 
  Olsson 
  and 
  Stossich. 
  

  

  Body 
  unarmed, 
  terete 
  oblong 
  (when 
  the 
  tail 
  is 
  retracted), 
  neck 
  some 
  

   what 
  attenuate, 
  excavate 
  beneath. 
  Ventral 
  sucker 
  larger 
  than 
  oral 
  

   sucker 
  (almost 
  four 
  times 
  as 
  large, 
  ^Stossieh) 
  at 
  base 
  of 
  neck, 
  spherical, 
  

   sessile, 
  and 
  prominent. 
  Mouth 
  subterminal, 
  semiglobose. 
  Pharynx 
  

   contiguous 
  with 
  oral 
  sucker; 
  oesoi)hagus 
  none; 
  intestinal 
  branches 
  

   narrow, 
  extending 
  to 
  base 
  of 
  appendix 
  (almost 
  to 
  a[)ex 
  of 
  appendix, 
  

   Stossich). 
  Testes 
  two, 
  globose 
  at 
  each 
  side 
  behind 
  the 
  ventral 
  sucker. 
  

   (Each 
  smaller 
  than 
  ovary, 
  Olsson.) 
  Seminal 
  vescicle 
  large, 
  ovate, 
  a 
  

   little 
  in 
  front 
  of 
  the 
  ventral 
  sucker. 
  Cirrus 
  short, 
  cylindrical, 
  smooth. 
  

   Vitellaria 
  two, 
  large, 
  near 
  together, 
  immediately 
  behind 
  the 
  ovary. 
  

   Ovary 
  large, 
  globose, 
  i^osterior. 
  ITterus 
  amjile, 
  gyri 
  between 
  testes 
  and 
  

   ovary, 
  ova 
  yellow. 
  Male 
  genital 
  aperture 
  in 
  front 
  of 
  female 
  in 
  middle 
  

   of 
  neck. 
  Length, 
  2-6 
  mm. 
  

  

  On 
  account 
  of 
  the 
  enormous 
  development 
  of 
  the 
  uterine 
  folds 
  and 
  the 
  

   lack 
  of 
  material 
  for 
  sectioning, 
  the 
  verification 
  of 
  all 
  the 
  above-named 
  

   specific 
  characters 
  is 
  not 
  possible. 
  The 
  resemblance 
  seems 
  to 
  be 
  near 
  

   enough, 
  however, 
  to 
  make 
  this 
  identification 
  probable. 
  The 
  dimensions 
  

   of 
  my 
  specimens 
  are: 
  Length, 
  5.50 
  mm.; 
  diameter 
  of 
  oral 
  sucker, 
  0.26; 
  

  

  