﻿Eeproductive 
  organs 
  of 
  Taenia 
  pisiformis. 
  o93 
  

  

  A 
  similar 
  case 
  is 
  shown 
  in 
  Fig*. 
  64, 
  the 
  aster 
  ^) 
  appearing 
  here 
  as 
  a 
  

   faint 
  ring, 
  while 
  the 
  spindle 
  and 
  astral 
  ra^^s 
  have 
  disappeared. 
  In 
  

   the 
  transition 
  of 
  the 
  $ 
  pronucleus 
  into 
  the 
  resting- 
  condition, 
  as 
  in 
  

   the 
  formation 
  of 
  the 
  abortive 
  maturation 
  spindle, 
  there 
  is 
  no 
  skein 
  

   stage, 
  the 
  chromosomes 
  simply 
  breaking 
  up 
  to 
  form 
  the 
  chromatin 
  

   reticulum 
  of 
  the 
  resting 
  nucleus 
  (Fig. 
  72). 
  I 
  have 
  found 
  a 
  few 
  similar 
  

   stages 
  but 
  these 
  were 
  the 
  clearest. 
  

  

  My 
  observations 
  regarding 
  the 
  scarcity 
  of 
  the 
  later 
  stages 
  of 
  

   mitosis 
  in 
  maturation 
  agree 
  with 
  those 
  of 
  Child 
  (1907, 
  II, 
  p. 
  140) 
  

   who 
  speaks 
  of 
  "the 
  very 
  rare 
  cases 
  in 
  which 
  anything 
  like 
  a 
  typical 
  

   anaphase 
  has 
  been 
  observed 
  in 
  Moni€sia'\ 
  

  

  After 
  the 
  entrance 
  of 
  the 
  oocytes 
  into 
  the 
  uterus 
  there 
  appears 
  

   upon 
  most 
  of 
  them 
  one 
  or 
  two 
  small 
  cells 
  which 
  are 
  so 
  closelj' 
  

   attached 
  to 
  them 
  that 
  they 
  are 
  flattened 
  on 
  the 
  side 
  of 
  attachment 
  

   and 
  appear 
  in 
  most 
  cases 
  at 
  least 
  to 
  form 
  a 
  constituent 
  part 
  of 
  the 
  

   former 
  (Figs. 
  63, 
  64, 
  66,72 
  et 
  seq.). 
  Their 
  diameter 
  is 
  about 
  Vs 
  — 
  V2 
  that 
  

   of 
  the 
  oocytes, 
  and 
  their 
  nucleus 
  is 
  relatively 
  large, 
  with 
  a 
  diameter 
  

   about 
  ^/2 
  that 
  of 
  the 
  cell. 
  This 
  is 
  surrounded 
  in 
  most 
  cases 
  by 
  a 
  

   rather 
  definite 
  membrane 
  and 
  usually 
  contains 
  one 
  chief 
  and 
  a 
  few 
  

   smaller 
  "nucleoli'' 
  united 
  by 
  an 
  indefinite 
  network. 
  

  

  In 
  his 
  account 
  of 
  the 
  embryology 
  of 
  Taenia 
  serrata 
  St. 
  Remy 
  

   (1901, 
  p. 
  147 
  et 
  seq.) 
  describes 
  the 
  egg 
  in 
  the 
  earliest 
  stage 
  observed 
  

   by 
  him 
  as 
  representing 
  "un 
  ensemble 
  de 
  deux 
  éléments 
  très 
  dis- 
  

   semblables, 
  accolés 
  l'un 
  à 
  l'autre 
  . 
  . 
  . 
  L'un 
  de 
  ces 
  éléments 
  est 
  une 
  

   cellule 
  à 
  protoplasma 
  peu 
  abondant 
  formant 
  une 
  sorte 
  de 
  réseau 
  

   dans 
  lequel 
  est 
  inclus 
  le 
  noyau, 
  petit, 
  très 
  riche 
  en 
  chromatine; 
  

   cette 
  cellule 
  est 
  ovoide 
  ou 
  allongée 
  par 
  suite 
  de 
  son 
  accolement 
  à 
  

   l'autre 
  élément: 
  on 
  peut 
  distinguer 
  cette 
  cellule 
  sous 
  le 
  nom 
  de 
  

   cellule 
  embryonnaire 
  principale". 
  In 
  the 
  next 
  stage 
  this 
  cell 
  has 
  

   divided 
  and 
  the 
  "cellule 
  vitellophage" 
  is 
  dividing. 
  One 
  of 
  the 
  two 
  

   daughter 
  cells 
  meantime 
  "grossit 
  peu 
  à 
  peu 
  et 
  son 
  protoplasma 
  se 
  

   charge 
  de 
  plus 
  en 
  plus 
  de 
  granulations 
  réfringentes 
  . 
  . 
  . 
  c'est 
  la 
  

   cellule 
  granuleuse 
  . 
  . 
  .". 
  Later 
  it 
  has 
  "devenue 
  très 
  grande 
  ... 
  le 
  

   protoplasma 
  très 
  peu 
  abondant 
  apparait 
  maintenant 
  plutôt 
  comme 
  

   un 
  coagulum 
  que 
  comme 
  un 
  réseau".^) 
  

  

  Van 
  Beneden 
  (1881) 
  gives 
  a 
  similar 
  account 
  in 
  that 
  the 
  egg 
  of 
  

  

  1) 
  "Aster" 
  as 
  here 
  used 
  is 
  synonymous 
  with 
  the 
  "centrosome" 
  of 
  

   EiCHARDS 
  and 
  Child. 
  

  

  2) 
  According 
  to 
  St. 
  Remy 
  (1. 
  c.) 
  this 
  cell 
  is 
  absent 
  in 
  AnoplocephaJa 
  . 
  

  

  