﻿CESTODE 
  PARASITES 
  OF 
  FISHES— 
  LIXTOX. 
  429 
  

  

  Cyaibocephahi8 
  truncatus 
  Pallas, 
  Zschokke, 
  Recli. 
  sur 
  le.s 
  Vers 
  Parasites 
  <les 
  

  

  Pois. 
  d'eau 
  donee, 
  pp. 
  37-40, 
  pi. 
  ix, 
  fig. 
  P. 
  

   Cyanthocephahts 
  truncatus 
  (Pall.\8) 
  Kksslek 
  aud 
  Ku.kmkh, 
  1892, 
  Zeitschrift 
  f. 
  \v. 
  

  

  Zoologie, 
  LIU, 
  4, 
  Heft 
  (sep. 
  alidr., 
  pp. 
  6-35, 
  XXVII, 
  figs. 
  1-14). 
  

  

  Xo. 
  4782, 
  U.S.N.M. 
  From 
  pyloric 
  cteca 
  of 
  common 
  wliite-iish 
  [Core- 
  

   gonit.s 
  cl 
  u 
  pel/or 
  mi 
  s) 
  Outer 
  Island, 
  Lake 
  Superior; 
  J. 
  W. 
  IMilner; 
  several 
  

   fragments, 
  not 
  in 
  good 
  state 
  of 
  preservation. 
  

  

  Body 
  fusiform 
  flattened, 
  head 
  fuunel-sliape. 
  Dimensions 
  of 
  typical 
  

   specimen: 
  Length, 
  7 
  mm.; 
  diameter 
  of 
  head 
  at 
  apex, 
  O.S; 
  diameter 
  of 
  

   head 
  at 
  base, 
  0.45; 
  length 
  of 
  head, 
  0.8; 
  maximum 
  diameter 
  of 
  body, 
  

   1.2. 
  Genital 
  apertures 
  along 
  middle 
  of 
  flat 
  surface 
  of 
  body 
  from 
  0.2 
  to 
  

   0.6 
  mm. 
  apart. 
  

  

  The 
  bodies 
  of 
  these 
  specimens 
  appear 
  to 
  be 
  unsegmented, 
  or, 
  at 
  best, 
  

   with 
  only 
  very 
  faint 
  indication 
  of 
  division 
  into 
  segments. 
  In 
  this 
  

   respect 
  they 
  differ 
  from 
  Zschokke's 
  figure 
  of 
  the 
  species, 
  but 
  agree 
  well 
  

   enough 
  with 
  his 
  written 
  account 
  of 
  it. 
  "The 
  segments 
  are 
  almost 
  twice 
  

   as 
  broad 
  as 
  long. 
  They 
  are 
  firmly 
  attached 
  to 
  each 
  other, 
  their 
  limits 
  

   being 
  seen 
  with 
  difficulty."^ 
  

  

  Calcareous 
  bodies 
  numerous, 
  many 
  shapes, 
  but 
  usually 
  irregularly 
  

   oblong, 
  from 
  0.01 
  to 
  0.02 
  mm. 
  in 
  length 
  and 
  showing 
  concentric 
  struc- 
  

   ture. 
  Genital 
  apertures 
  about 
  middle 
  of 
  segments. 
  Ova 
  were 
  seen 
  

   lying 
  in 
  clusters 
  near 
  middle 
  of 
  segments 
  (specimen 
  in 
  oil 
  of 
  cloves 
  aud 
  

   viewed 
  on 
  flat 
  surface 
  of 
  body) 
  behind 
  and 
  to 
  one 
  side 
  of 
  cirrus 
  bulb, 
  

   germ 
  glaiul 
  farther 
  back 
  at 
  posterior 
  edge 
  of 
  segment; 
  testes 
  median; 
  

   vitelline 
  glands 
  lateral, 
  voluminous 
  in 
  transverse 
  lobules. 
  The 
  nucle- 
  

   ated 
  cells 
  in 
  the 
  germ-gland 
  are 
  0.01 
  mm. 
  in 
  diameter; 
  cirrus-bulb 
  

   pyriform 
  wath 
  thick, 
  muscular 
  wall, 
  transverse 
  diameter, 
  0.13o; 
  longi- 
  

   tudinal 
  diameter, 
  0.12; 
  uterus 
  mainly 
  dorsal. 
  Musculature 
  appears 
  

   like 
  that 
  of 
  the 
  genus 
  Dibotlirium. 
  Longitudinal 
  muscle 
  fibers 
  stronger 
  

   and 
  more 
  numerous 
  in 
  anterior 
  part 
  of 
  body, 
  somewhat 
  scattered 
  in 
  

   j)osterior 
  j)arts 
  of 
  body. 
  

  

  Ova 
  in 
  sj)ecimen 
  in 
  acetic 
  acid, 
  typical, 
  0.05 
  and 
  0.032 
  mm. 
  in 
  two 
  

   principal 
  diameters. 
  

  

  This, 
  I 
  believe, 
  is 
  the 
  first 
  notice 
  of 
  this 
  rare 
  parasite 
  on 
  this 
  conti- 
  

   nent. 
  

  

  7. 
  DIBOTHRIUM 
  MANUBRIFORME 
  Linton. 
  

  

  IHhothrium 
  manuhriforme 
  LiXTON, 
  U. 
  S. 
  Fish 
  Com. 
  Kept., 
  1886, 
  pp. 
  456-458, 
  pi. 
  i, 
  

   figs. 
  1-4; 
  1887, 
  pp. 
  728-731. 
  

  

  No. 
  4711, 
  U.S.N.M. 
  Label 
  reads: 
  "From 
  rectum 
  of 
  Tetrapterus, 
  

   B. 
  G. 
  Wilder, 
  August 
  5, 
  Penikese.'' 
  

  

  Numerous 
  specimens, 
  fifty 
  or 
  more, 
  tangled 
  in 
  a 
  mass 
  and 
  in 
  a 
  poor 
  

   state 
  of 
  preservation. 
  Largest 
  complete 
  specimen 
  noted 
  measured 
  115 
  

   mm. 
  in 
  length 
  and 
  3.5 
  in 
  greatest 
  breadth. 
  Heads 
  of 
  diverge 
  shapes. 
  

   Dimensions 
  of 
  heads: 
  Length 
  of 
  one, 
  2 
  mm.; 
  breadth, 
  1; 
  length 
  of 
  

   another, 
  2.5; 
  breadth, 
  1; 
  length 
  of 
  another, 
  1.5; 
  breadth, 
  1.2. 
  

  

  ' 
  Eech. 
  svir 
  les 
  Vers 
  Parasites 
  des 
  Pois. 
  d'eau 
  douce, 
  ji. 
  38. 
  

  

  