﻿524 
  J. 
  BliETLAND 
  FAIiMEE 
  AND 
  J. 
  E. 
  S. 
  MOORE. 
  

  

  commencement 
  of 
  the 
  bomotype 
  division 
  form, 
  for 
  the 
  most 
  

   part, 
  rod-like 
  bodies 
  directed 
  radially 
  in 
  the 
  equatorial 
  

   plane 
  ; 
  often 
  they 
  are 
  very 
  clearly 
  seen 
  to 
  be 
  double 
  at 
  this 
  

   stage, 
  and 
  when 
  looked 
  at 
  from 
  the 
  side 
  present 
  the 
  appear- 
  

   ance 
  of 
  dyads. 
  Some 
  of 
  the 
  chromosomes 
  are 
  scattered 
  

   through 
  the 
  equatorial 
  plane, 
  and 
  are 
  thus 
  not 
  confined 
  to 
  a 
  

   peripheral 
  position. 
  As 
  the 
  daughter 
  elements 
  separate 
  from 
  

   each 
  other 
  they 
  assume 
  remarkable 
  forms 
  ; 
  the 
  general 
  

   impression 
  obtained 
  is 
  that 
  of 
  viscous 
  bodies 
  forcibly 
  pulled 
  

   asunder. 
  Thus 
  they 
  become 
  very 
  much 
  attenuated 
  and 
  

   elongated 
  as 
  they 
  finally 
  separate 
  and 
  travel 
  to 
  the 
  respective 
  

   poles 
  of 
  the 
  spindle. 
  On 
  reaching 
  the 
  poles 
  they 
  very 
  rapidly 
  

   shorten 
  and 
  thicken 
  as 
  the 
  daughter 
  nuclei 
  pass 
  into 
  the 
  state 
  

   of 
  telophase 
  and 
  ultimately 
  of 
  rest. 
  

  

  III. 
  Aneura 
  pinguis. 
  

  

  This 
  species 
  of 
  Liverwort 
  exhibits 
  certain 
  remarkable 
  

   peculiarities 
  connected 
  with 
  the 
  formation 
  and 
  division 
  of 
  the 
  

   spore-mother- 
  cell 
  that 
  are 
  absent 
  from 
  the 
  corresponding- 
  

   mitoses 
  of 
  most 
  plants. 
  On 
  the 
  other 
  hand, 
  they 
  are 
  shared 
  

   by 
  most, 
  if 
  not 
  by 
  all, 
  of 
  the 
  members 
  of 
  the 
  Jungermannia 
  

   series 
  of 
  Hepatica?,^ 
  although 
  in 
  different 
  degrees. 
  At 
  the 
  

   close 
  of 
  the 
  archesporial 
  cell-divisions, 
  as 
  the 
  individual 
  cells 
  

   become 
  free 
  from 
  each 
  other 
  by 
  the 
  dissolution 
  of 
  the 
  middle 
  

   lamellae, 
  those 
  cells 
  that 
  are 
  destined 
  to 
  give 
  rise 
  to 
  spores 
  

   soon 
  become 
  differentiated 
  from 
  those 
  that 
  will 
  ultimately 
  

   form 
  the 
  elaters. 
  At 
  first 
  the 
  contour 
  of 
  each 
  is 
  irregularly 
  

   spherical, 
  but 
  as 
  they 
  enlarge 
  in 
  size, 
  it 
  is 
  seen 
  that 
  each 
  

   spore-mother-cell 
  becomes 
  symmetrically 
  bulged 
  out 
  at 
  four 
  

   spots, 
  so 
  as 
  to 
  form 
  a 
  quadrilobed 
  cell. 
  The 
  lobes 
  are 
  arranged 
  

   tetrahedrally, 
  each 
  diverging 
  from 
  the 
  common 
  centre, 
  and 
  

   thus 
  the 
  axis 
  of 
  no 
  two 
  or 
  more 
  of 
  them 
  can 
  lie 
  in 
  the 
  same 
  

   plane. 
  Hence 
  it 
  follows 
  that 
  it 
  is 
  necessary 
  to 
  exercise 
  care 
  

   in 
  interpreting 
  and 
  combining 
  the 
  results 
  of 
  observations 
  made 
  

   on 
  sections 
  of 
  such 
  a 
  sti'ucture. 
  Aneura 
  is, 
  however, 
  specially 
  

  

  ' 
  Cf. 
  P'armcr, 
  " 
  Studies 
  in 
  Hepaticae/' 
  * 
  Annals 
  of 
  Botany,' 
  vols, 
  viii 
  and 
  ix. 
  

  

  