﻿524 
  PROCEEDIXGS 
  OF 
  THE 
  XATIOXAL 
  MUSEUM. 
  

  

  with 
  triangular 
  aperture. 
  Crura 
  of 
  intestines 
  voluiniuous, 
  sacculated, 
  

   niucli 
  inflated 
  posteriorly. 
  Testes 
  two 
  oblong 
  masses 
  placed 
  trans- 
  

   versely 
  about 
  uiidAvay 
  between 
  tbe 
  ventral 
  sucker 
  and 
  the 
  posterior 
  end, 
  

   and 
  separated 
  from 
  each 
  other 
  by 
  what 
  I 
  take 
  to 
  be 
  the 
  rudimentary 
  

   ovary, 
  a 
  portion 
  of 
  the 
  seminiferous 
  vessels 
  and 
  some 
  of 
  the 
  uterine 
  folds. 
  

   What 
  appears 
  to 
  be 
  the 
  cirrus 
  poucli 
  lies 
  immediately 
  in 
  front 
  of 
  the 
  

   auterior 
  testes 
  and 
  a 
  little 
  to 
  the 
  right. 
  A 
  median 
  vessel, 
  with 
  walls 
  of 
  

   cuboid 
  nucleated 
  cells, 
  which 
  appears 
  to 
  be 
  an 
  anterior 
  prolongation 
  of 
  

   the 
  developing 
  uterus, 
  lies 
  along 
  the 
  median 
  line 
  from 
  near 
  the 
  orifice 
  

   of 
  the 
  cirrus 
  pouch 
  nearly 
  to 
  the 
  ventral 
  sucker. 
  It 
  receives 
  a 
  tube 
  of 
  

   similar 
  appearance 
  and 
  histological 
  structure, 
  which 
  originates 
  between 
  

   the 
  testes 
  and 
  passes 
  around 
  the 
  left 
  end 
  of 
  tlie 
  anterior 
  testes. 
  The 
  

   vitellaria 
  are 
  indicated 
  by 
  granular 
  clusters, 
  which 
  extend 
  from 
  the 
  

   posterior 
  end 
  nearly 
  to 
  the 
  ventral 
  sucker. 
  

  

  These 
  specimens, 
  at 
  least 
  the 
  one 
  figured 
  (Fig. 
  0), 
  upon 
  which 
  the 
  

   above 
  description 
  is 
  based, 
  appear 
  to 
  be 
  further 
  developed 
  than 
  Wright's 
  

   specimens 
  and 
  confirm 
  his 
  conjecture 
  as 
  to 
  the 
  probable 
  adult 
  form 
  of 
  this 
  

   species. 
  The 
  disposition 
  of 
  the 
  reproductive 
  organs 
  here 
  made 
  out 
  for 
  

   Distomum 
  gracile 
  leaves 
  little 
  doubt 
  that 
  it 
  is 
  very 
  closely 
  related 
  to 
  

   Distonivm 
  heterostomum. 
  Wright^ 
  describes 
  and 
  figures 
  a 
  distomum 
  

   which 
  he 
  refers 
  provisionally 
  to 
  D. 
  heterostomum 
  Rudolphi,and 
  which 
  he 
  

   has 
  found 
  in 
  the 
  mouth 
  of 
  the 
  American 
  bittern 
  {Botau7-us 
  minor 
  

   Gmeliu), 
  that 
  may 
  indeed 
  be 
  the 
  adult 
  form 
  of 
  J), 
  gracile. 
  

  

  I 
  have 
  found 
  five 
  specimens 
  of 
  the 
  above 
  Distomum 
  in 
  the 
  National 
  

   Museum 
  collection 
  (No. 
  4851, 
  U.S.N.M.). 
  The 
  vial 
  contained 
  ])ieces 
  of 
  

   liver 
  of 
  the 
  host 
  Lepomis 
  aurifus, 
  with 
  numerous 
  small, 
  encapsuled 
  trem 
  

   atodes 
  {Diplostonium 
  cuticole), 
  and 
  one 
  leech 
  {Ichthyohdella 
  sp.). 
  Three 
  

   of 
  the 
  examples 
  were 
  encapsuled 
  and 
  two 
  free. 
  The 
  encapsuled 
  speci- 
  

   mens 
  were 
  folded 
  with 
  the 
  ventral 
  surface 
  out. 
  

  

  Another 
  specimen 
  (Fig. 
  7), 
  ISTo. 
  4850, 
  U. 
  S. 
  N. 
  M., 
  was 
  found 
  in 
  a 
  vial 
  

   containing 
  leeches 
  {Ichthf/ohfleUa 
  sp.) 
  from 
  the 
  gills, 
  roof 
  of 
  the 
  mouth, 
  

   and 
  under 
  the 
  pectoral 
  fins 
  of 
  Eiipomotis 
  paUidus 
  and 
  Clurnobfj/ftus 
  

   gulosHs; 
  collected 
  by 
  Mr. 
  jST. 
  A. 
  Harvey, 
  Kansas 
  City, 
  Missouri. 
  

  

  This 
  specimen, 
  alcoholic, 
  had 
  the 
  following 
  dimensions: 
  Length, 
  4..5 
  

   mm.; 
  breadth 
  at 
  anterior 
  sucker, 
  0.02; 
  breadth 
  at 
  ventral 
  sucker, 
  1.13; 
  

   maximum 
  breadth, 
  1.."); 
  diameter 
  of 
  oral 
  sucker, 
  0.1*7; 
  diameter 
  of 
  

   ventral 
  sucker, 
  0.75. 
  

  

  18. 
  DISTOMUM 
  LAGENIFORME, 
  new 
  species. 
  

   (Plate 
  XLVII, 
  tigs. 
  1,2.) 
  

  

  The 
  following 
  (lescription 
  is 
  based 
  on 
  a 
  single 
  specimen 
  from 
  the 
  body 
  

   cavity 
  of 
  Bemora 
  reniora 
  ; 
  Woods 
  IIoll, 
  Massachusetts, 
  August 
  1, 
  

   1887. 
  

  

  The 
  living 
  worm 
  (Fig. 
  1) 
  was 
  approximately 
  20 
  mm. 
  in 
  length 
  and 
  G 
  

   in 
  greatest 
  breadth, 
  long, 
  oval 
  in 
  outline, 
  neck 
  nearly 
  eylindrical 
  at 
  

  

  Contril). 
  to 
  Amer. 
  Helm., 
  pp. 
  3-6, 
  iigs. 
  1, 
  2. 
  

  

  