﻿TBEMATODE 
  FAEASITES 
  OF 
  FISHES— 
  LIXTOX. 
  527 
  

  

  pallens 
  Rudolplii, 
  is 
  here 
  described 
  as 
  far 
  as 
  the 
  very 
  limited 
  amount 
  of 
  

   nijvterial 
  will 
  permit. 
  

  

  l>ody 
  subcyliiidrical, 
  with 
  somewhat 
  rhombic-ovate 
  outline, 
  crossed 
  

   with 
  minute 
  rugje 
  in 
  anterior 
  and 
  median 
  region, 
  ^eck 
  short, 
  conical, 
  

   minutely 
  papillose 
  on 
  dorsal 
  side, 
  near 
  head. 
  Mouth 
  subtermiiial, 
  

   aperture 
  circular. 
  Ventral 
  sucker, 
  red, 
  nearly 
  twice 
  the 
  diauieter 
  of 
  

   the 
  oral 
  sucker, 
  prominent, 
  aperture 
  transverse. 
  Yitellaria 
  lateral 
  in 
  

   posterior 
  half, 
  yellow 
  in 
  life. 
  Testes 
  situated 
  about 
  posterior 
  fourth, 
  

   opaque 
  white. 
  Uterus 
  with 
  rather 
  numerous 
  ova 
  colored 
  deep 
  brown, 
  

   and 
  situated 
  in 
  a 
  mass 
  immediately 
  behind 
  the 
  ventral 
  sucker. 
  Branches 
  

   of 
  intestine 
  extend 
  to 
  near 
  posterior 
  end. 
  

  

  The 
  following 
  dimensions 
  were 
  obtained 
  from 
  measurements 
  of 
  the 
  

   living- 
  specimen, 
  slightly 
  compressed: 
  Length, 
  3.10 
  mm.; 
  breadth, 
  ante- 
  

   rior, 
  0.40; 
  breadth, 
  median. 
  0.80; 
  breadth, 
  posterior, 
  0.60; 
  diameter 
  of 
  

   oral 
  sucker, 
  0l'4; 
  diameter 
  of 
  posterior 
  sucker, 
  0.46; 
  distance 
  between 
  

   suckers, 
  centers, 
  0.68. 
  

  

  In 
  the 
  alcoholic 
  specimen 
  the 
  dimensions 
  of 
  the 
  suckers 
  were 
  

   unclianged 
  from 
  what 
  they 
  were 
  in 
  life 
  and 
  the 
  pharynx 
  measured 
  0.154 
  

   mm. 
  in 
  length 
  and 
  0,168 
  in 
  breadth. 
  

  

  The 
  ova 
  measure 
  0.0(>7 
  mm. 
  iu 
  length 
  and 
  0.034 
  in 
  breadth. 
  

  

  I 
  find 
  no 
  meution 
  of 
  papilhe 
  or 
  rugte 
  in 
  my 
  notes 
  made 
  at 
  tiie 
  time 
  of 
  

   collecting. 
  The 
  alcoholic 
  specimen, 
  however, 
  is 
  crossed 
  by 
  minute 
  ruga^ 
  

   and 
  the 
  anterior 
  region 
  is 
  minutely 
  and, 
  at 
  least 
  opposite 
  the 
  oral 
  sucker 
  

   on 
  the 
  dorsal 
  surface, 
  densely 
  papillose. 
  

  

  Found 
  in 
  AJutera 
  sch(epfii: 
  Woods 
  Holl, 
  Massachusetts, 
  July 
  24, 
  

   1887. 
  

  

  21. 
  DISTOMUM 
  VALDEINFLATUM 
  Stossich. 
  

  

  (Plates 
  XLVII, 
  figs. 
  10-14; 
  XLVIII, 
  figs. 
  1,2.) 
  

  

  Disionmm 
  raldeinflatnm 
  Stossich, 
  Bull. 
  8oc. 
  Adriat. 
  Trieste, 
  VIII, 
  1883, 
  p. 
  114, 
  

   pi. 
  I, 
  fig. 
  4. 
  — 
  Cakus, 
  Prodr. 
  Fanna» 
  Mediterr., 
  I, 
  1884, 
  p. 
  127. 
  — 
  Stossich, 
  

   Dist. 
  d. 
  Pesc, 
  18S6, 
  p. 
  35. 
  

  

  Body 
  terete, 
  subspherical 
  behind; 
  neck 
  long, 
  cylindrical, 
  covered 
  with 
  

   spines 
  which 
  are 
  evanescent 
  toward 
  the 
  posterior 
  part 
  of 
  the 
  body; 
  os 
  

   terminal; 
  acetabulum 
  sessile 
  larger 
  than 
  oral 
  sucker, 
  at 
  the 
  base 
  of 
  the 
  

   neck. 
  Head 
  cercinate, 
  armed 
  with 
  a 
  double 
  crown 
  of 
  hooks, 
  sixteen 
  

   hooks 
  in 
  each, 
  those 
  of 
  the 
  anterior 
  circle 
  the 
  stronger. 
  No. 
  4869, 
  

   r.S.N.M. 
  Length, 
  2.5 
  to 
  3 
  mm. 
  

  

  1 
  refer 
  to 
  this 
  species 
  certain 
  Distoma 
  found 
  inclosed 
  in 
  globular 
  caj)- 
  

   sules 
  and 
  attached, 
  usually 
  by 
  a 
  slender 
  peduncle, 
  to 
  the 
  peritoneum 
  of 
  

   the 
  host, 
  Aluiera 
  sclio'pfii. 
  

  

  The 
  capsules 
  consisted 
  of 
  an 
  outer 
  cj'st 
  of 
  connective 
  tissue 
  contain- 
  

   ing 
  a 
  thin 
  hyaline 
  sac 
  in 
  which 
  lay 
  a 
  larval 
  Distomum. 
  The 
  posterior 
  

   end 
  of 
  the 
  latter 
  was 
  swollen 
  and 
  globular 
  and 
  when 
  compressed, 
  in 
  a 
  

   living 
  specimen, 
  was 
  seen 
  to 
  be 
  tilled 
  with 
  white 
  food-material 
  (paren- 
  

   chyma), 
  which 
  was 
  iu 
  communication" 
  with 
  the 
  posterior 
  ends 
  of 
  the 
  

   intestine. 
  

  

  