﻿No.li:«. 
  TREMATODE 
  PARASITES 
  OF 
  FISHES— 
  LIXTOX. 
  509 
  

  

  Dimensions 
  of 
  three 
  alcoholic 
  specimens 
  of 
  Nitzschia 
  papillosa. 
  

  

  Meaaurements. 
  

  

  No. 
  1. 
  No. 
  2. 
  No. 
  3 
  

  

  mm. 
  m,m,. 
  

  

  Length 
  1.90 
  | 
  1.90 
  

  

  Diameter 
  of 
  posterior 
  sucker 
  45 
  .45 
  

  

  Diameter 
  iu 
  front 
  of 
  sucker 
  32 
  ' 
  .28 
  

  

  Breadth 
  of 
  body, 
  median 
  55 
  .40 
  

  

  Breadth 
  of 
  body, 
  anterior 
  30 
  .22 
  

  

  mm. 
  

  

  0.98 
  

   .23 
  

   .16 
  

   .22 
  

   .16 
  

  

  3. 
  TRISTOMUM 
  L.<EVE 
  Verrill(?). 
  

  

  (Plate 
  XL, 
  ti.us. 
  7,8.) 
  

  

  Tristomani 
  hvre 
  Verrill, 
  Amer. 
  Jour. 
  Sci., 
  X, 
  p. 
  40; 
  gills 
  of 
  Tciraptenoi 
  albidus; 
  

   Aim. 
  Report, 
  U. 
  S. 
  Fish 
  Com., 
  1883, 
  &g. 
  194. 
  

  

  1 
  refer 
  provisionally 
  to 
  this 
  si)ecies 
  a 
  single 
  Tristomum 
  from 
  the 
  gills 
  

   oi 
  Gymnosarda 
  pelamys, 
  t'A\LQnhY 
  the, 
  United 
  States 
  Fish 
  Commission 
  

   schooner 
  Grampus, 
  south 
  of 
  Marthas 
  Yinej'^ard, 
  Massachusetts, 
  August 
  

   18, 
  1886. 
  :So. 
  1878, 
  U.S.X.^I. 
  

  

  The 
  specimen 
  was 
  associated 
  with 
  numerous 
  oval 
  cysts, 
  3,5 
  and 
  2 
  mm. 
  

   in 
  the 
  two 
  principal 
  diameters, 
  in 
  which 
  I 
  was 
  unable 
  to 
  find 
  any 
  

   parasite. 
  

  

  Dimensions 
  of 
  alcoholic 
  si)ecimens: 
  Length, 
  4.5 
  mm.; 
  breadth, 
  4.75; 
  

   diameter 
  of 
  i)Osterior 
  sucker, 
  2.8; 
  transverse 
  diameter 
  of 
  anterior 
  

   suckers, 
  1.04; 
  longitudinal 
  diameter 
  of 
  same, 
  0.65; 
  distance 
  between 
  

   edges 
  of 
  anterior 
  suckers, 
  0.28. 
  

  

  Orbicular 
  margin 
  entire 
  or 
  faintly 
  undulating, 
  with 
  a 
  deep, 
  narrow 
  

   posterior 
  emargination, 
  minutely 
  punctate 
  below; 
  posterior 
  sucker 
  

   large, 
  prominent, 
  with 
  crenulate 
  border, 
  the 
  seven 
  radii 
  confluent 
  in 
  a 
  

   rather 
  large 
  central 
  body; 
  anterior 
  suckers 
  squarish 
  oblong, 
  trans- 
  

   verse; 
  anterior 
  border 
  of 
  body 
  reflected 
  ventrally 
  between 
  the 
  two 
  

   anterior 
  suckers. 
  

  

  4. 
  TRISTOMUM 
  COCCINEUM 
  Cuvier. 
  

  

  (Plate 
  XL, 
  tio-. 
  9.) 
  

  

  Trisiomum 
  coccineinn 
  Diesing, 
  Syst. 
  Helm., 
  I, 
  p. 
  429. 
  — 
  Taschenbero, 
  Abhandl. 
  

   Naturf. 
  Gesellsch., 
  Halle, 
  XIV, 
  pp. 
  296-314, 
  pis. 
  i, 
  ii, 
  figs. 
  3-9. 
  — 
  Monticelli, 
  

   Bull. 
  Soc. 
  Nat. 
  Naples, 
  1st 
  ser., 
  V, 
  p. 
  123. 
  

  

  From 
  gills 
  of 
  Swordflsh 
  {Xijjhias 
  gladius); 
  off 
  Marthas 
  Vineyard, 
  

   Massachusetts, 
  July 
  25, 
  1887. 
  Thirty-seven 
  specimens. 
  No. 
  4877, 
  

   U.S.N^.M. 
  

  

  When 
  first 
  removed 
  from 
  the 
  gills 
  of 
  their 
  host 
  they 
  were 
  nearly 
  all 
  

   vermilion 
  red 
  in 
  color, 
  but 
  the 
  color 
  disappeared 
  when 
  dead 
  — 
  i. 
  e., 
  after 
  

   a 
  niimber 
  of 
  hours 
  in 
  water. 
  

  

  Body 
  flattened 
  broadly, 
  and 
  somewhat 
  irregularly 
  ovate, 
  posterior 
  

   entire, 
  lateral 
  borders 
  crenulate, 
  ventral 
  periphery 
  with 
  low 
  nodular 
  

   papill.e; 
  each 
  papilla 
  with 
  opaque 
  granules; 
  dorsal 
  surface 
  covered 
  

   posteriorly 
  with 
  sharp- 
  pointed 
  papilhc, 
  which 
  become 
  scattering 
  toward 
  

  

  