﻿Reproductive 
  organs 
  of 
  Taenia 
  pisiformis. 
  395 
  

  

  one 
  would 
  expect 
  to 
  find 
  it 
  at 
  least 
  occasionally 
  in 
  the 
  stage 
  of 
  

   reconstitution 
  after 
  the 
  maturation 
  mitosis. 
  Such 
  a 
  stage 
  however 
  

   I 
  have 
  never 
  seen 
  in 
  my 
  own 
  material, 
  nor 
  have 
  I 
  seen 
  it 
  described 
  

   or 
  figured 
  by 
  anyone 
  else.^) 
  

  

  Third. 
  The 
  nucleus 
  of 
  this 
  cell 
  is 
  identical 
  with 
  that 
  of 
  the 
  

   yolk 
  cells. 
  Compare 
  Figs. 
  63, 
  64 
  et 
  seq. 
  with 
  Fig. 
  58. 
  

  

  Fourth. 
  I 
  occasionally 
  find 
  what 
  is 
  probably 
  the 
  remnant 
  of 
  

   the 
  yolk 
  in 
  this 
  cell 
  (Fig. 
  76). 
  Usually 
  however 
  it 
  is 
  devoid 
  of 
  

   yolk 
  so 
  that 
  if 
  its 
  identification 
  as 
  a 
  yolk 
  cell 
  be 
  correct 
  the 
  yolk 
  

   must 
  be 
  rapidly 
  surrendered 
  to 
  the 
  egg 
  after 
  their 
  union. 
  In 
  this 
  

   connection 
  the 
  description 
  and 
  figures 
  of 
  the 
  "first 
  polar 
  body" 
  in 
  

   Moniezia 
  given 
  by 
  Child 
  (1907, 
  III, 
  p. 
  140) 
  are 
  of 
  interest. 
  He 
  

   interprets 
  a 
  dark 
  staining 
  mass 
  beside 
  the 
  nucleus 
  as 
  a 
  centrosome, 
  

   of 
  which 
  he 
  says, 
  "This 
  centrosome 
  . 
  . 
  . 
  apparently 
  undergoes 
  con- 
  

   densation 
  to 
  such 
  an 
  extent 
  that 
  it 
  stains 
  as 
  deeply 
  with 
  iron 
  

   haematoxylin 
  as 
  a 
  mass 
  of 
  chromatin 
  or 
  a 
  yolk 
  granule.-) 
  

  

  Fifth. 
  I 
  have 
  found 
  cases 
  of 
  ooc3^tes 
  in 
  the 
  uterus 
  resembling 
  

   in 
  every 
  way 
  ovarian 
  oocytes, 
  and 
  which 
  therefore 
  probably 
  had 
  not 
  

   yet 
  undergone 
  either 
  maturation 
  or 
  fertilization, 
  which 
  had 
  one 
  or 
  

   two 
  of 
  these 
  cells 
  attached 
  to 
  them 
  (Figs. 
  78 
  and 
  79). 
  

  

  Sixth. 
  Yolk 
  cells 
  are 
  occasionally 
  found 
  free 
  in 
  the 
  uterus 
  

   among 
  the 
  developing 
  eggs 
  and 
  embryos. 
  This 
  fact, 
  which 
  is 
  denied 
  

   b}^ 
  Child 
  (1907, 
  III) 
  in 
  Moniezia, 
  is 
  plainly 
  shown 
  in 
  Fig. 
  75. 
  The 
  

   moment 
  of 
  union 
  of 
  the 
  two 
  cells 
  has 
  not 
  been 
  observed 
  by 
  Leuckaet, 
  

   V. 
  Janicki, 
  or 
  myself, 
  and 
  it 
  is 
  doubtful 
  if 
  it 
  could 
  be 
  certainly 
  

   identified 
  even 
  tho 
  it 
  were 
  observed. 
  Where 
  cells 
  are 
  so 
  closely 
  

   packed 
  as 
  they 
  frequently 
  are 
  in 
  the 
  uterus 
  it 
  would 
  obviously 
  be 
  

   difficult 
  to 
  say 
  whether 
  a 
  yolk 
  and 
  an 
  egg 
  cell 
  in 
  close 
  contact 
  

   with 
  one 
  another 
  were 
  actually 
  uniting 
  or 
  merely 
  in 
  apposition. 
  

  

  Seventh. 
  The 
  irregularity 
  of 
  position 
  of 
  the 
  abortive 
  maturation 
  

   spindle 
  with 
  reference 
  to 
  these 
  cells, 
  renders 
  their 
  interpretation 
  as 
  

   polar 
  bodies 
  improbable. 
  (Compare 
  Figs. 
  63 
  and 
  64 
  with 
  73.) 
  

  

  Eighth. 
  The 
  inconstancy 
  in 
  number 
  of 
  these 
  cells, 
  usually 
  one, 
  

   occasionally 
  two 
  (Fig. 
  74), 
  argues 
  against 
  their 
  interpretation 
  as 
  

   polar 
  bodies. 
  

  

  1) 
  HiCHAEDS 
  (1909) 
  has 
  described 
  and 
  figured 
  a 
  mitotic 
  division 
  of 
  

   ihis 
  cell, 
  and 
  Child 
  (1907, 
  III) 
  mentions 
  an 
  apparent 
  abortive 
  mitosis 
  in 
  

   the 
  first 
  polar 
  body. 
  These 
  observations 
  however 
  in 
  no 
  way 
  weaken 
  the 
  

   evidence 
  regarding 
  the 
  lack 
  of 
  reconstitution 
  stages 
  in 
  this 
  cell. 
  

  

  2) 
  Italics 
  mine. 
  

  

  