﻿72 
  

  

  ming 
  stage, 
  but 
  the 
  majority 
  had 
  only 
  reached 
  the 
  later 
  

   periods 
  of 
  segmentation, 
  appearing 
  as 
  figured 
  by 
  Brooks, 
  

   in 
  Nos. 
  25, 
  26, 
  27. 
  

  

  At 
  8.00 
  P. 
  M., 
  there 
  were 
  large 
  numbers 
  in 
  the 
  first 
  

   swimming 
  stage 
  at 
  the 
  surface 
  of 
  the 
  water, 
  the 
  cilia 
  were 
  

   well 
  defined 
  and 
  active 
  ; 
  in 
  many 
  cases 
  the 
  polar 
  globule 
  

   was 
  still 
  observable. 
  The 
  majority 
  of 
  the 
  embryos 
  ap- 
  

   peared 
  as 
  fig 
  a 
  red 
  by 
  Brooks, 
  in 
  Nos. 
  32, 
  34 
  and 
  35, 
  while 
  

   a 
  feAv 
  were 
  in 
  more 
  advanced 
  stages, 
  appearing 
  as 
  in 
  86 
  

   and 
  87. 
  The 
  pressure 
  of 
  other 
  duties 
  prevented 
  my 
  

   continuance 
  of 
  the 
  observations 
  after 
  11 
  P. 
  M. 
  until 
  11 
  

   A. 
  M. 
  on 
  the 
  8th. 
  At 
  that 
  time 
  the 
  majority 
  of 
  the 
  

   embryos 
  were 
  as 
  figured 
  in 
  Nos. 
  86, 
  37 
  and 
  38, 
  the 
  latter 
  

   stage 
  pred(mnnating. 
  The 
  shell 
  was 
  remarkably 
  well 
  

   defined 
  in 
  several, 
  but 
  the 
  activity 
  of 
  the 
  end^ryo 
  and 
  the 
  

   rudeness 
  of 
  the 
  instrument 
  used, 
  prevented 
  my 
  deciding 
  

   with 
  cei'tainty 
  as 
  to 
  the 
  extent 
  <^f 
  the 
  develojmient 
  of 
  the 
  

   digestive 
  ti-act 
  or 
  the 
  presence 
  of 
  either 
  the 
  niouth 
  or 
  

   anus. 
  

  

  At 
  11 
  P. 
  M., 
  on 
  the 
  8th, 
  or 
  two 
  days 
  and 
  three 
  hours 
  

   after 
  fertilization, 
  I 
  found 
  one 
  embryo 
  that 
  so 
  exactly 
  

   resemliled 
  figure 
  86, 
  that 
  it 
  might 
  have 
  been 
  the 
  original 
  

   from 
  which 
  the 
  figure 
  was 
  drawn. 
  About 
  this 
  time 
  I 
  

   experienced 
  my 
  first 
  difficulty 
  in 
  finding 
  specimens, 
  but 
  

   my 
  observation 
  of 
  those 
  embryos 
  discovered 
  was 
  very 
  

   careful 
  and 
  close, 
  and 
  I 
  have 
  no 
  doubt 
  that 
  their 
  devel- 
  

   opment 
  so 
  far 
  was 
  similar 
  to 
  that 
  of 
  our 
  own 
  species. 
  

   Subsequent 
  to 
  this 
  time, 
  the 
  intervals 
  between 
  my 
  obser- 
  

   vations 
  were 
  greater, 
  owing 
  to 
  the 
  necessity 
  of 
  my 
  

   employment 
  upon 
  other 
  duty 
  : 
  and 
  my 
  absence 
  from 
  the 
  

   vessel 
  compelled 
  me 
  to 
  put 
  the 
  endn-yos 
  under 
  the 
  care 
  

   of 
  others 
  ; 
  consequently 
  in 
  the 
  intervening 
  lumrs, 
  changes 
  

   may 
  have 
  occurred 
  which 
  are 
  unknown 
  to 
  me, 
  and 
  many 
  

   of 
  the 
  end)ryos 
  nuiy 
  have 
  advanced 
  beyond 
  the 
  latest 
  

   stages 
  which 
  came 
  under 
  my 
  observation, 
  but 
  so 
  far 
  as 
  I 
  

   know, 
  none 
  advanced 
  beyond 
  those 
  stages 
  figured 
  by 
  

   Brooks. 
  

  

  