﻿24 
  Dr. 
  L. 
  Plate 
  on 
  Noctiluca 
  miliaris, 
  Sur. 
  

  

  two 
  others, 
  which 
  stand, 
  symmetrically 
  grouped, 
  not 
  far 
  from 
  

   the 
  tentacle, 
  and 
  which 
  yet 
  certainly 
  owe 
  their 
  origin 
  to 
  the 
  

   same 
  conditions 
  as 
  the 
  outgrowths 
  formed 
  by 
  the 
  bacillar 
  

   organ. 
  Unfortunately 
  I 
  omitted 
  to 
  make 
  myself 
  sure 
  of 
  this 
  

   point 
  upon 
  the 
  living 
  animal. 
  Noctilucce 
  in 
  course 
  of 
  regene- 
  

   ration 
  are, 
  in 
  consequence 
  of 
  their 
  contracted 
  plasma, 
  specifi- 
  

   cally 
  somewhat 
  heavier 
  than 
  the 
  normal 
  individuals 
  ; 
  while 
  

   the 
  latter 
  rise 
  to 
  the 
  surface 
  of 
  the 
  water 
  in 
  a 
  quiet 
  vessel, 
  

   the 
  former 
  sink 
  to 
  the 
  bottom. 
  Hence, 
  if 
  we 
  examine 
  the 
  

   bottom 
  -deposit 
  we 
  easily 
  find 
  such 
  five-horned 
  individuals 
  

   among 
  the 
  animals 
  engaged 
  in 
  regeneration 
  which 
  vary 
  

   extraordinarily 
  in 
  the 
  length 
  and 
  form 
  of 
  the 
  horns, 
  as 
  well 
  

   as 
  in 
  the 
  outline 
  of 
  the 
  body. 
  

  

  It 
  is 
  as 
  yet 
  not 
  positively 
  ascertained 
  which 
  of 
  the 
  two 
  

   modes 
  of 
  reproduction 
  of 
  Noctiluca 
  is 
  the 
  more 
  frequent. 
  

   According 
  to 
  my 
  observations 
  there 
  can 
  be 
  no 
  doubt 
  that 
  in 
  

   point 
  of 
  number 
  the 
  formation 
  of 
  s 
  warmers 
  exceeds 
  repro- 
  

   duction 
  by 
  simple 
  division. 
  It 
  is 
  only 
  the 
  circumstance 
  that 
  

   certain 
  stages 
  of 
  the 
  latter 
  process 
  cannot 
  at 
  the 
  first 
  glance 
  

   be 
  distinguished 
  from 
  conjugation 
  that 
  renders 
  the 
  recognition 
  

   of 
  the 
  true 
  state 
  of 
  things 
  difficult. 
  I 
  have 
  isolated 
  a 
  great 
  

   number 
  of 
  biscuit-shaped 
  pairs, 
  and 
  watched 
  them 
  for 
  some 
  

   time 
  ; 
  only 
  a 
  very 
  few 
  of 
  them 
  were 
  engaged 
  in 
  division, 
  

   while 
  all 
  the 
  rest 
  finally 
  became 
  fused 
  into 
  single 
  individuals. 
  

   As 
  we 
  meet 
  with 
  such 
  figure-of-eight-shaped 
  Noctilucce 
  about 
  

   as 
  frequently 
  as 
  animals 
  with 
  a 
  swarmer-disk, 
  this 
  gives 
  a 
  

   considerable 
  preponderance 
  to 
  gemmation 
  over 
  simple 
  

   division. 
  

  

  On 
  the 
  details 
  of 
  the 
  process 
  of 
  conjugation 
  we 
  have 
  

   already 
  been 
  well 
  informed 
  by 
  Cienkowski. 
  The 
  two 
  pairers 
  

   are 
  almost 
  always 
  of 
  equal 
  size 
  and 
  are 
  generally 
  middle- 
  

   sized 
  or 
  small 
  individuals, 
  and 
  as, 
  on 
  the 
  other 
  hand, 
  the 
  

   Noctilucce 
  engaged 
  in 
  the 
  production 
  of 
  swarmers 
  are 
  usually 
  

   quite 
  full-grown, 
  this 
  circumstance 
  also 
  would 
  indicate 
  that 
  

   the 
  buds 
  are 
  formed 
  after 
  a 
  conjugation 
  and 
  that 
  their 
  forma- 
  

   tion 
  is 
  also 
  connected 
  with 
  the 
  latter. 
  It 
  must 
  not 
  be 
  for- 
  

   gotten, 
  however, 
  that 
  in 
  Noctiluca 
  miliaris 
  the 
  age 
  of 
  the 
  

   individuals 
  cannot 
  always 
  be 
  estimated 
  from 
  their 
  size, 
  

   because 
  the 
  animals 
  too 
  often 
  cast 
  off 
  a 
  part 
  of 
  their 
  mem- 
  

   brane 
  * 
  and 
  take 
  on 
  a 
  smaller 
  volume 
  by 
  contraction 
  of 
  the 
  

   plasma. 
  

  

  The 
  adhesion 
  of 
  the 
  two 
  pairers 
  is 
  effected 
  by 
  means 
  of 
  a 
  

  

  * 
  This 
  observation 
  may 
  be 
  very 
  easily 
  made 
  on 
  animals 
  which 
  have 
  

   been 
  somewhat 
  disturbed 
  on 
  the 
  object-slide 
  ; 
  it 
  appears 
  to 
  me 
  to 
  prove 
  

   that 
  BiitschH 
  (Morphol. 
  Jahrb. 
  Bd. 
  x. 
  p. 
  564) 
  is 
  not 
  right 
  in 
  denying 
  to 
  

   Noctiluca 
  anv 
  cuticular 
  membrane. 
  

  

  