﻿538 
  I'liOCKElUNliS 
  OF 
  THE 
  NATIONAL 
  .V 
  CSEUM. 
  vol.. 
  xx. 
  

  

  suckers 
  circular. 
  Testes 
  two, 
  large, 
  close 
  together, 
  a 
  little 
  back 
  of 
  mid- 
  

   dle 
  of 
  body. 
  Vitellaria 
  filling 
  body 
  behind 
  testes 
  and 
  extending 
  for- 
  

   ward 
  along 
  each 
  side 
  to 
  and 
  beyond 
  the 
  ventral 
  sucker. 
  Uterus 
  lying- 
  

   in 
  a 
  few 
  folds 
  in 
  front 
  of 
  anterior 
  testis. 
  Ova 
  not 
  very 
  numerous. 
  

  

  One 
  specimen 
  (No. 
  0504, 
  U.S.N.M.) 
  was 
  obtained 
  from 
  the 
  intestine 
  

   of 
  L<i<iocephalus 
  Icviuf/atus, 
  Woods 
  Holl, 
  Massachusetts 
  (Xarragantiett 
  

   Bay),"july22, 
  1887. 
  

  

  The 
  alcoholic 
  specimen 
  was 
  found 
  to 
  be 
  in 
  i)oor 
  condition 
  and 
  these 
  

   notes 
  are 
  made 
  up 
  from 
  a 
  few 
  notes 
  and 
  an 
  incomplete 
  sketch 
  made 
  at 
  

   the 
  time 
  of 
  collecting. 
  

  

  The 
  dimensions 
  of 
  the 
  living 
  worm: 
  Length, 
  2.S 
  mm.; 
  diameter 
  of 
  

   oral 
  sucker, 
  0.24; 
  diameter 
  of 
  ventral 
  sucker, 
  0.24; 
  distance 
  between 
  

   suckers, 
  0.41; 
  breadth 
  of 
  body 
  at 
  oral 
  sucker, 
  0,()8; 
  breadth 
  at 
  ventral 
  

   sucker, 
  0.83; 
  maximum 
  breadth 
  of 
  body, 
  1.04. 
  The 
  ova 
  were 
  not 
  meas 
  

   ured 
  in 
  the 
  living 
  specimen. 
  In 
  the 
  preserved 
  specimen 
  they 
  were 
  

   much 
  collapsed, 
  so 
  that 
  satisfactory 
  measurements 
  could 
  not 
  be 
  ob 
  

   tained. 
  The 
  ova 
  measured 
  0.066 
  and 
  0.051 
  in 
  length, 
  respectively, 
  and 
  

   O.O.io 
  in 
  shorter 
  diameter; 
  another 
  which 
  appeared 
  to 
  be 
  surrounded 
  by 
  

   a 
  thin 
  pellicle 
  measured 
  0.035 
  and 
  0.022 
  in 
  the 
  two 
  principal 
  diameters. 
  

  

  •2d. 
  DISTOMUM 
  RACHION 
  Ccbboldi?). 
  

   (Plate 
  LIU, 
  rigs. 
  3-7.) 
  

  

  JHslomtiM 
  racltion 
  Cohbold, 
  Traus. 
  Lin. 
  Soc, 
  XXII, 
  p. 
  158, 
  pl.xxxi, 
  rigs. 
  9, 
  10. 
  — 
  

   Stossich, 
  Dist. 
  d. 
  Pesc, 
  p. 
  43. 
  

  

  it 
  has 
  the 
  following 
  dimensions: 
  Length, 
  3 
  mm.; 
  diameter, 
  anterior, 
  

   0.3; 
  median, 
  0.55; 
  posterior, 
  0.2; 
  diameter 
  of 
  ventral 
  sucker, 
  0.18; 
  aper- 
  

   ture, 
  0.09; 
  diameter 
  of 
  oral 
  sucker, 
  0.3; 
  aperture, 
  0.16; 
  length 
  of 
  i)har- 
  

   ynx, 
  0.2; 
  diameter, 
  0.14; 
  length 
  of 
  (esophagus, 
  0.1. 
  

  

  The 
  specimen 
  has 
  about 
  as 
  many 
  points 
  of 
  agreement 
  with 
  descrip- 
  

   tions 
  of 
  I), 
  areolatuni 
  Kudolphi, 
  as 
  with 
  those 
  of 
  B. 
  rachion. 
  It 
  ap- 
  

   pears, 
  however, 
  to 
  be 
  nearer 
  the 
  latter 
  than 
  the 
  former, 
  and 
  since 
  its 
  

   agreement 
  with 
  that 
  species 
  appears 
  to 
  be 
  close 
  1 
  notice 
  it 
  under 
  the 
  

   name 
  D. 
  rachion. 
  Further, 
  D. 
  rachion 
  was 
  found 
  by 
  Cobbold 
  in 
  the 
  

   Haddok, 
  while 
  I), 
  areolatum 
  has 
  its 
  habitat 
  in 
  the 
  Pleuronectidoe. 
  

  

  It 
  is 
  oblong 
  linear, 
  flattened, 
  s(iuarisli 
  in 
  front, 
  obtuse 
  behind, 
  maxi- 
  

   mum 
  breadth 
  near 
  middle, 
  whence 
  it 
  ta[)ers 
  gradually 
  to 
  the 
  tail, 
  nar- 
  

   rowing 
  scarcely 
  at 
  all 
  anteriorly, 
  laterally 
  arcuate; 
  posterior 
  extremity 
  

   emarginate 
  with 
  terminal 
  pore; 
  neck 
  covered 
  densely 
  with 
  squamose 
  

   spines 
  becoming 
  sparsely 
  scattered 
  back 
  of 
  ventral 
  sucker, 
  and 
  very 
  

   few 
  near 
  posterior 
  end. 
  Back 
  of 
  the 
  ventral 
  sucker 
  the 
  spines 
  are 
  

   confined 
  to 
  the 
  lateral 
  regions. 
  The 
  si)ines 
  appear 
  tiat 
  and 
  scale 
  like 
  on 
  

   neck 
  and 
  are 
  uniformly 
  disposed 
  in 
  close 
  transverse 
  rows; 
  posteriorly 
  

   they 
  are 
  slender. 
  Diameter 
  of 
  squamo.se 
  sjnnes, 
  0,01 
  mm. 
  ; 
  length 
  about 
  

   the 
  same. 
  Ova 
  not 
  numerous, 
  about 
  30, 
  lying 
  behind 
  ventral 
  sucker, 
  

   rather 
  large, 
  0.07 
  and 
  0.04 
  mm. 
  in 
  the 
  two 
  prin('ii)al 
  diameters. 
  Length 
  

   of 
  cirrus 
  j)ouch, 
  0,21; 
  greatest 
  diameter, 
  0.16. 
  

  

  