﻿532 
  PROCEEDINGS 
  OF 
  TEE 
  NATIONAL 
  MUSEUM. 
  

  

  24. 
  DISTOMUM 
  FOLIATUM, 
  new 
  species. 
  

   (Plates 
  XLIX, 
  tigs. 
  3-5; 
  L, 
  ligs. 
  1-3; 
  LI, 
  tigs. 
  1-4.) 
  

  

  Type. 
  — 
  No. 
  4849, 
  U.S. 
  N. 
  M. 
  Body 
  cylindrical, 
  somewhat 
  linear, 
  but 
  

   ^ith 
  constrictions 
  and 
  enlargements, 
  ntncli 
  contorted 
  in 
  alcoholic 
  

   specimens 
  (not 
  seen 
  living). 
  Xeck 
  iisuiilly 
  arcuate, 
  strongly 
  reflected. 
  

   ]Month 
  ringent, 
  ai)ertnre 
  transverse 
  directed 
  downward, 
  upper 
  lip 
  i)ro- 
  

   Jecting. 
  Dorsum 
  of 
  head 
  and 
  neck 
  with 
  crest 
  of 
  (six 
  or 
  eight) 
  nodular 
  

   eminences, 
  wiiich 
  were 
  white 
  in 
  alcoholic 
  specimens; 
  seen 
  in 
  sections 
  

   to 
  consist 
  of 
  strong 
  muscular 
  libers, 
  as 
  in 
  the 
  pharynx 
  and 
  suckers. 
  

   Ventral 
  sucker 
  consisting 
  of 
  four 
  foliate 
  flaps 
  (Plates 
  XLIX, 
  fig. 
  3; 
  L, 
  

   figs. 
  1-3; 
  pedicellate, 
  the 
  pedicel 
  variable, 
  usually 
  greatly 
  swollen 
  and 
  

   containing 
  voluminous 
  folds 
  of 
  the 
  uterus, 
  vitellaria, 
  and 
  seminal 
  recep- 
  

   tacle, 
  in 
  some 
  cases 
  separated 
  by 
  a 
  constriction 
  from 
  the 
  body. 
  (I'late 
  

   L, 
  fig. 
  2.) 
  In 
  most 
  cases 
  there 
  is 
  a 
  profound 
  constriction 
  of 
  the 
  body 
  

   immediately 
  behind 
  the 
  ventral 
  sucker. 
  The 
  pedicel 
  is 
  sometimes 
  

   directed 
  forward, 
  continuing 
  the 
  general 
  direction 
  of 
  the 
  axis 
  of 
  the 
  body 
  ; 
  

   in 
  other 
  cases 
  it 
  is 
  at 
  right 
  angles 
  to 
  the 
  body 
  and 
  continues 
  the 
  general 
  

   direction 
  of 
  the 
  axis 
  of 
  the 
  neck. 
  The 
  specimens 
  studied 
  were 
  all 
  mature, 
  

   and 
  the 
  very 
  voluminous 
  folds 
  of 
  the 
  uterus 
  filled 
  the 
  body 
  from 
  a 
  short 
  

   way 
  behind 
  the 
  oral 
  sucker 
  to 
  near 
  the 
  posterior 
  end 
  of 
  the 
  body. 
  The 
  

   uterus 
  was 
  crowded 
  with 
  small 
  elliptical 
  ovu. 
  The 
  (esophagus 
  is 
  very 
  

   short; 
  the 
  pharynx 
  oblong, 
  its 
  length 
  exceeding 
  half 
  the 
  diameter 
  of 
  

   the 
  oral 
  sucker. 
  The 
  cirrus 
  bulb 
  is 
  relatively 
  small 
  and 
  lies 
  near 
  ven- 
  

   tral 
  surface 
  of 
  the 
  neck, 
  but 
  a 
  short 
  distance 
  back 
  of 
  the 
  oral 
  sucker, 
  

   the 
  genital 
  aperture 
  being 
  on 
  a 
  leval 
  with 
  the 
  anterior 
  end 
  of 
  the 
  

   pharynx. 
  The 
  anterior 
  duct 
  of 
  the 
  uterus 
  along 
  ventral 
  side 
  of 
  neck; 
  

   seminal 
  receptacle 
  in 
  voluminous 
  folds 
  in 
  pedicel 
  and 
  nearly 
  whole 
  

   length 
  of 
  neck. 
  Testes 
  two, 
  large, 
  lying 
  a 
  little 
  m 
  front 
  of 
  the 
  post- 
  

   acetabular 
  region 
  of 
  the 
  body. 
  Vitellaria 
  distributed 
  from 
  a 
  point 
  Just 
  

   behind 
  the 
  oral 
  sucker 
  as 
  far 
  back 
  as 
  the 
  ovary, 
  most 
  abundant 
  in 
  neck 
  

   and 
  in 
  constricted 
  part 
  of 
  body 
  between 
  ventral 
  sucker 
  and 
  anterior 
  

   testis, 
  reddish-brown 
  in 
  carmine-stained 
  sections. 
  

  

  Dimensions 
  are 
  not 
  of 
  much 
  value 
  in 
  the 
  ideritification 
  of 
  forms 
  of 
  

   such 
  extremely 
  variable 
  contractile 
  shapes, 
  and 
  the 
  measurements 
  here 
  

   given 
  must 
  be 
  expected 
  to 
  differ 
  greatly 
  from 
  those 
  of 
  living 
  specimens. 
  

   The 
  largest 
  measured 
  at 
  least 
  as 
  much 
  as 
  16 
  mm. 
  in 
  length. 
  

  

  A 
  medium 
  sized 
  specimen 
  yielded 
  the 
  following 
  measurements: 
  

   Length, 
  12 
  mm,; 
  length 
  of 
  neck, 
  2.54; 
  length 
  of 
  oral 
  sucker, 
  0.82; 
  

   depth 
  of 
  oral 
  sucker, 
  side 
  view, 
  0.65; 
  diameter 
  of 
  neck, 
  0.85; 
  maxi- 
  

   mum 
  diameter 
  of 
  body, 
  1.28; 
  minimum 
  diameter 
  of 
  body, 
  0.6; 
  diame- 
  

   ter 
  of 
  ventral 
  sucker, 
  1.9; 
  length 
  of 
  Oisophagns, 
  0.09; 
  length 
  of 
  pharynx. 
  

   0.48. 
  Average 
  diameters 
  of 
  ova, 
  0.0o2 
  and 
  0.0. 
  ,'2 
  in 
  the 
  two 
  principal 
  

   directions. 
  

  

  An 
  examination 
  of 
  a 
  good 
  series 
  of 
  transverse 
  sections 
  revealed 
  many 
  

   interesting 
  details, 
  the 
  more 
  important 
  of 
  which 
  are 
  here 
  recorded. 
  The 
  

   connection 
  between 
  the 
  (esophagus 
  and 
  the 
  intestinal 
  crura 
  was 
  not 
  

  

  