﻿NO. 
  1133. 
  TREMATODE 
  PAEASITES 
  OF 
  FISHES— 
  LINTON. 
  519 
  

  

  is 
  very 
  short, 
  while 
  that 
  of 
  7>. 
  monticellii 
  is 
  moderately 
  large. 
  It 
  is 
  

   invaginated 
  in 
  most 
  of 
  my 
  s])ecimeiis, 
  and 
  furnishes 
  a 
  point 
  of 
  resem- 
  

   blance 
  to 
  I), 
  appendicn 
  latum. 
  The 
  body 
  of 
  D. 
  monticelUl 
  is 
  nearly 
  

   smooth, 
  tine 
  transverse 
  rng;v 
  only 
  being- 
  levealed 
  under 
  high 
  magni- 
  

   fication, 
  while 
  both_D. 
  appendiGuIatunt 
  and 
  A. 
  stossichii 
  are 
  transversely 
  

   plicate.' 
  

  

  I 
  append 
  a 
  few 
  notes 
  made 
  at 
  the 
  time 
  of 
  collecting. 
  The 
  worms 
  

   when 
  first 
  removed 
  from 
  their 
  host 
  and 
  placed 
  in 
  sea 
  water 
  were 
  quite 
  

   active. 
  The 
  anterior 
  part 
  of 
  the 
  body 
  could 
  be 
  elongated 
  until 
  the 
  

   attenuated 
  neck 
  was 
  equal 
  in 
  length 
  to 
  one-third 
  the 
  body. 
  The 
  dis- 
  

   tance 
  between 
  the 
  suckers 
  when 
  at 
  rest 
  being 
  about 
  0.5 
  mm., 
  increased 
  

   to 
  over 
  1 
  mm. 
  Dimensions 
  of 
  a 
  typical 
  living 
  specimen: 
  Length, 
  5.4 
  

   mm.; 
  greatest 
  diameter, 
  1 
  mm.; 
  diameter 
  of 
  oral 
  sucker, 
  0.1 
  mm; 
  diam- 
  

   eter 
  of 
  ventral 
  sucker, 
  0.54 
  mm. 
  

  

  The 
  color 
  of 
  some 
  of 
  the 
  organs 
  is 
  quite 
  different 
  when 
  seen 
  by 
  trans- 
  

   mitted 
  light 
  from 
  what 
  it 
  is 
  under 
  reflected 
  light. 
  One 
  specimen 
  

   presented 
  the 
  following 
  colors: 
  Oral 
  sucker 
  dull 
  reddish-brown, 
  after- 
  

   wards 
  yellow; 
  ventral 
  sucker 
  light 
  yellowish-brown, 
  with 
  reflected 
  light 
  

   golden 
  yellow, 
  with 
  reddish-brown 
  center; 
  intestine 
  grayish, 
  faint 
  i)ur- 
  

   ple 
  with 
  reflected 
  light; 
  seminal 
  receptacle 
  and 
  cirrus 
  pouch 
  pale 
  

   reddish-brown, 
  light 
  purple 
  with 
  reflected 
  light; 
  testes 
  reddish-brown, 
  

   dark 
  purple 
  with 
  reiiected 
  light; 
  uterus 
  with 
  ova 
  golden 
  yellow 
  ; 
  ground 
  

   color 
  of 
  body 
  pale 
  yellow, 
  with 
  faint 
  reddish-brown 
  tinge 
  in 
  the 
  mem- 
  

   branous 
  mass 
  at 
  the 
  posterior 
  end 
  of 
  the 
  body; 
  excretory 
  vessel 
  dark 
  

   brown, 
  bright 
  green 
  by 
  reflected 
  light. 
  

  

  Another 
  specimen 
  which 
  had 
  been 
  lying 
  in 
  sea 
  water 
  for 
  a 
  number 
  of 
  

   hours 
  had 
  a 
  transparent 
  bluish- 
  white 
  ground 
  color, 
  the 
  uterus 
  with 
  

   ova 
  was 
  a 
  beautiful 
  golden 
  yellow, 
  the 
  testes, 
  suckers, 
  pharynx, 
  crura 
  

   of 
  intestine, 
  cirrus 
  pouch 
  and 
  terminal 
  ])ortion 
  (invaginated 
  ?) 
  a 
  little 
  

   opaque; 
  vitelline 
  glands 
  and 
  excretory 
  vessel 
  dead 
  opaque 
  white. 
  

  

  Crura 
  of 
  intestines 
  large, 
  inflated, 
  pulsating 
  in 
  life, 
  sometimes 
  so 
  

   much 
  inflated 
  as 
  to 
  fill 
  the 
  body 
  cavity 
  back 
  of 
  vitelline 
  glands. 
  Pos- 
  

   terior 
  end 
  of 
  body 
  usually 
  occupied 
  by 
  an 
  invaginated 
  portion 
  of 
  the 
  

   tail. 
  

  

  The 
  ova 
  in 
  life 
  measured 
  0.025 
  and 
  0.014 
  mm. 
  in 
  the 
  two 
  principal 
  

   diameters; 
  in 
  alcoholic 
  specimens, 
  0.018 
  and 
  0.011 
  mm. 
  in 
  the 
  two 
  

   diameters. 
  

  

  In 
  alcoholic 
  specimens 
  the 
  neck 
  is 
  short, 
  conical, 
  and 
  curved 
  veu- 
  

   trally. 
  The 
  ventral 
  sucker 
  is 
  three 
  times 
  the 
  diameter 
  of 
  the 
  oral 
  

   sucker. 
  The 
  body 
  is 
  of 
  nearly 
  uniform 
  diameter 
  from 
  the 
  ventral 
  

   sucker 
  to 
  about 
  the 
  posterior 
  third, 
  whence 
  it 
  tapers 
  gradually 
  to 
  the 
  

   posterior 
  end, 
  which 
  is 
  truncate, 
  the 
  posterior 
  end 
  being, 
  as 
  a 
  rule, 
  

   invaginated. 
  It 
  was 
  invaginated 
  in 
  all 
  the 
  fresh 
  specimens 
  examined. 
  

  

  The 
  dimensions 
  of 
  an 
  alcoholic 
  specimen 
  follow: 
  Length, 
  5.12 
  mm.; 
  

   diameter 
  of 
  oral 
  sucker, 
  0.18 
  mm.; 
  diameter 
  of 
  ventral 
  sucker, 
  0.56 
  

  

  'Monticelli 
  erects 
  Dujardin's 
  subgenus 
  ApohJema 
  into 
  a 
  genus. 
  

  

  