﻿CESTODE 
  PARASITES 
  OF 
  FISHES— 
  TAXTOX. 
  425 
  

  

  2. 
  TAENIA 
  DILATATA 
  Linton. 
  

  

  Tania 
  dilatata 
  Linton, 
  U. 
  S. 
  V\s\\ 
  Com. 
  Rept., 
  1886, 
  pp. 
  488-489, 
  pi. 
  v, 
  ligs. 
  14-16. 
  

  

  No. 
  4812, 
  U.S.N.M. 
  From 
  common 
  eel 
  {AnguiUa 
  chri/soija). 
  Several 
  

   strobiles 
  but 
  in 
  bad 
  state 
  of 
  preservation 
  ; 
  no 
  scolices; 
  anterior 
  ends 
  

   have 
  been 
  exceedingly 
  long 
  and 
  slender. 
  The 
  characteristic 
  dilata- 
  

   tions 
  of 
  this 
  species 
  can 
  not 
  be 
  proved 
  from 
  these 
  specimens. 
  The 
  

   general 
  appearance 
  of 
  the 
  strobiles, 
  as 
  well 
  as 
  the 
  character 
  of 
  the 
  seg- 
  

   ments, 
  however, 
  agrees 
  with 
  this 
  species. 
  

  

  It 
  may 
  be 
  added 
  that 
  the 
  segments 
  of 
  these 
  specimens 
  agree 
  with 
  

   Moliu's 
  description 
  of 
  his 
  T. 
  hemisplieriea. 
  With 
  the 
  evidence 
  at 
  hand, 
  

   however, 
  I 
  do 
  not 
  feel 
  justified 
  in 
  uniting 
  the 
  two 
  species 
  of 
  T. 
  dilatata 
  

   and 
  T. 
  kennspherica. 
  

  

  3. 
  TAENIA 
  OCELLATA 
  Rudolphi(?). 
  

  

  (Plate 
  XXVII, 
  figs. 
  6-11.) 
  

  

  Tania 
  ocellaia 
  Diesing, 
  Syst. 
  Helm., 
  I, 
  p. 
  513; 
  Revis, 
  d. 
  Cepbal., 
  Cycl., 
  pp. 
  

   376-377.— 
  Von 
  Linstow, 
  Troscli. 
  Arcliiv., 
  1875, 
  I, 
  p. 
  184.— 
  Zschokke, 
  Recb. 
  

   Vers 
  Parasit. 
  dcs 
  Poissons 
  d'eaii 
  donee, 
  pp. 
  13-14. 
  

  

  No. 
  4742, 
  U.S.N.M. 
  Two 
  tapeworms 
  from 
  rock-bass 
  {AmhlopUtes 
  

   rupentris), 
  J. 
  W. 
  Milner. 
  Doctor 
  Joseph 
  Leidy 
  describes 
  a 
  tapeworm 
  

   from 
  this 
  fish' 
  under 
  the 
  name 
  of 
  Ta')iia 
  (onhJojtIitis, 
  which 
  he 
  states 
  

   resembles 
  T. 
  ocellaia 
  Kudolphi 
  of 
  the 
  European 
  perch 
  {Perca 
  Jlumatilis) 
  

   and 
  perhaps 
  is 
  the 
  same. 
  

  

  My 
  specimens 
  agree 
  with 
  Doctor 
  Leidy's 
  pretty 
  well 
  excei)t 
  in 
  the 
  

   character 
  of 
  the 
  neck. 
  In 
  T. 
  ambloplitis 
  the 
  neck 
  is 
  described 
  as 
  " 
  short 
  

   or 
  none.'' 
  In 
  my 
  sj^ecimens 
  the 
  neck 
  is 
  long. 
  

  

  There 
  is 
  need 
  of 
  special 
  systematic 
  work 
  to 
  be 
  done 
  on 
  species 
  of 
  the 
  

   genus 
  Twnia 
  infestiug 
  the 
  fresh 
  water 
  fishes 
  of 
  North 
  America. 
  Of 
  the 
  

   specimens 
  that 
  have 
  fallen 
  under 
  my 
  observation, 
  thus 
  far 
  only 
  alco- 
  

   holic, 
  there 
  are 
  jiresent 
  so 
  many 
  chara(;ters 
  that 
  seem 
  to 
  unite 
  them 
  

   with 
  some 
  established 
  European 
  species, 
  at 
  the 
  same 
  time 
  with 
  so 
  many 
  

   contradictory 
  characters, 
  that 
  satisfactory 
  identifications 
  can 
  not 
  be 
  

   made. 
  

  

  The 
  two 
  specimens 
  in 
  this 
  lot 
  are 
  310 
  and 
  470 
  mm. 
  in 
  length, 
  respec- 
  

   tively. 
  Other 
  dimensions 
  of 
  the 
  larger 
  specimens 
  are: 
  Diameter 
  of 
  head, 
  

   0.75 
  ram.; 
  breadth 
  of 
  neck, 
  0.55; 
  thickness 
  of 
  neck, 
  0.5; 
  diameter 
  of 
  

   sucker, 
  0.4. 
  

  

  Head 
  squarish, 
  depressed, 
  bothria 
  orbicular, 
  prominent, 
  with 
  strong- 
  

   muscular 
  structure. 
  The 
  head 
  is 
  slightly 
  prominent 
  at 
  apex 
  and 
  is 
  ter- 
  

   minated 
  by 
  a 
  small 
  pore, 
  which 
  may 
  and 
  proba^bly 
  does 
  function 
  as 
  a 
  

   sucker. 
  Neck 
  narrower 
  than 
  head, 
  subcylindrical, 
  increasing 
  in 
  breadth 
  

   uniformly 
  for 
  the 
  first 
  15 
  mm., 
  where, 
  in 
  the 
  larger 
  specimen 
  its 
  

   breadth 
  is 
  1,35 
  mm.; 
  it 
  is 
  unjointed, 
  but 
  is 
  moderately 
  wrinkled 
  trans- 
  

   versely, 
  transparent, 
  with 
  somewhat 
  delicate 
  tissue. 
  The 
  first 
  segments 
  

   are 
  about 
  30 
  mm. 
  back 
  of 
  the 
  head; 
  1.5 
  broad 
  and 
  0.25 
  long; 
  indistinct. 
  

  

  'Proc. 
  Acad. 
  Nat. 
  Sci., 
  Phila., 
  1887, 
  pp. 
  22-23, 
  figs. 
  7-8. 
  

  

  