﻿Reproductive 
  organs 
  of 
  Taenia 
  pisiformis. 
  397 
  

  

  as 
  well 
  as 
  distributed 
  thru 
  the 
  tissues. 
  Whatever 
  be 
  the 
  reason 
  

   for 
  the 
  difference 
  in 
  behavior 
  of 
  these 
  bodies 
  in 
  van 
  Beneden's 
  

   material 
  and 
  my 
  own, 
  there 
  can 
  be 
  little 
  doubt 
  after 
  a 
  comparison 
  of 
  

   my 
  figures 
  with 
  those 
  of 
  Leuckaet, 
  van 
  Beneden, 
  St. 
  Remy, 
  v. 
  Janicki, 
  

   and 
  Child 
  that 
  we 
  all 
  refer 
  to 
  the 
  same 
  element, 
  and 
  the 
  evidence 
  

   above 
  stated 
  supports 
  the 
  view 
  of 
  Leuckart 
  and 
  v. 
  Janicki 
  that 
  

   it 
  is 
  a 
  yolk 
  cell. 
  

  

  But 
  if 
  this 
  cell 
  is 
  not 
  a 
  polar 
  body, 
  what 
  represents 
  the 
  latter 
  

   or 
  are 
  any 
  such 
  cells 
  formed 
  in 
  Taenia 
  pisiformis? 
  Information 
  

   regarding 
  these 
  structures 
  in 
  cestodes 
  is 
  extremely 
  meager, 
  the 
  reason 
  

   for 
  which 
  will 
  I 
  believe 
  appear 
  later. 
  The 
  statements 
  of 
  Moniez 
  (1881) 
  

   regarding 
  the 
  polar 
  bodies 
  in 
  Moniesia 
  expansa 
  are 
  far 
  from 
  clear. 
  

   According 
  to 
  him 
  the 
  ^gg 
  after 
  fertilization 
  divides 
  into 
  two 
  parts, 
  

   one 
  of 
  which 
  (the 
  polar 
  body) 
  remains 
  within 
  the 
  yolk 
  mass. 
  The 
  

   latter 
  soon 
  divides 
  in 
  two, 
  each 
  of 
  which 
  contains 
  a 
  large 
  cellular 
  

   element 
  — 
  these 
  form 
  the 
  two 
  polar 
  bodies. 
  In 
  Taenia 
  marginata 
  

   etc. 
  the 
  first 
  two 
  blastomeres 
  each 
  contain 
  a 
  sort 
  of 
  little 
  cell 
  

   homologous 
  to 
  a 
  polar 
  body, 
  while 
  in 
  Taenia 
  sp. 
  from 
  domestic 
  duck 
  % 
  

   T. 
  serpentulus 
  and 
  Phyllohothrium 
  thridax 
  the 
  polar 
  body 
  apparently 
  

   corresponds 
  to 
  the 
  „cellule 
  granuleuse" 
  of 
  van 
  Beneden 
  and 
  St. 
  Remy. 
  

   VAN 
  Beneden 
  (1881) 
  in 
  Taenia 
  serrata 
  describes 
  two 
  small 
  refractive 
  

   bodies, 
  which 
  he 
  suggests 
  may 
  be 
  polar 
  bodies. 
  In 
  his 
  study 
  of 
  

   several 
  species 
  of 
  Bothriocephalidae 
  Schauinsland 
  (1885) 
  once 
  observed- 
  

   two 
  small 
  bodies 
  which 
  were 
  perhaps 
  polar 
  bodies, 
  these 
  are 
  

   probably 
  hidden 
  by 
  the 
  yolk. 
  St. 
  Remy 
  (1900) 
  has 
  described 
  two 
  

   similar 
  bodies 
  in 
  Anopïocephaïa 
  mamillana 
  which, 
  according 
  to 
  him^ 
  

   are 
  absent 
  in 
  Taenia 
  serrata. 
  His 
  description 
  however 
  like 
  that 
  of 
  

   preceding 
  authors, 
  is 
  very 
  brief 
  and 
  his 
  figures 
  by 
  no 
  means 
  carry 
  

   conviction 
  that. 
  what 
  he 
  describes 
  as 
  polar 
  bodies 
  are 
  in 
  reality 
  

   such. 
  I 
  shall 
  refer 
  below 
  to 
  these 
  figures, 
  v. 
  Janicki 
  (1907) 
  from 
  

   sections 
  of 
  Taenia 
  serrata 
  describes 
  and 
  figures 
  the 
  formation 
  of 
  

   polar 
  bodies. 
  In 
  his 
  account, 
  as 
  in 
  that 
  of 
  Child 
  already 
  mentioned, 
  

   there 
  is 
  a 
  sad 
  lack 
  of 
  information 
  regarding 
  the 
  actual 
  formation 
  of 
  

   these 
  bodies. 
  This 
  author 
  describes 
  and 
  figures 
  maturation 
  stages 
  

   as 
  late 
  as 
  the 
  anaphase, 
  but 
  he 
  gives 
  no 
  account 
  of 
  any 
  telophase 
  

   whatever, 
  and 
  the 
  process 
  of 
  extrusion 
  of 
  these 
  bodies 
  has 
  evidently 
  

   escaped 
  him. 
  One 
  is 
  furthermore 
  struck 
  by 
  the 
  several 
  "?" 
  in 
  his 
  

   figures 
  and 
  cannot 
  but 
  ask 
  what 
  evidence 
  there 
  is 
  that 
  the 
  struc- 
  

  

  1) 
  In 
  this 
  species 
  it 
  is 
  not 
  granular. 
  

  

  