﻿PLATE 
  II. 
  

  

  [The 
  vitellus 
  in 
  most 
  of 
  these 
  Figs, 
  is 
  uurepresented. 
  The 
  small 
  dots 
  be- 
  

   side 
  certain 
  of 
  the 
  figures 
  sho^v 
  the 
  natural 
  size 
  of 
  the 
  epeciraens.] 
  

  

  Fig. 
  ] 
  — 
  Nearly 
  profile 
  view 
  of 
  embryo, 
  showing 
  anterior 
  or 
  

   head 
  enlargement, 
  (page 
  64.) 
  

  

  Fig. 
  2 
  — 
  Nearly 
  profile 
  view 
  of 
  embryo^ 
  showing 
  cerebral 
  

   vesicles, 
  and 
  still 
  open 
  anterior 
  end 
  of 
  neural 
  

   canalj 
  (page 
  64.) 
  

  

  Fig. 
  3 
  — 
  Nearly 
  profile 
  view 
  of 
  embryo_, 
  showing 
  eye-disks, 
  

   (page 
  64.) 
  

  

  Fig. 
  4 
  — 
  Profile 
  view 
  of 
  embryo, 
  showing 
  proto-vertebrao 
  

   and 
  traces 
  of 
  the 
  notochord, 
  (page 
  65.) 
  

  

  Fig. 
  5 
  — 
  Profile 
  view 
  of 
  embryo 
  ; 
  proto-vertebra) 
  more 
  ad- 
  

   vanced 
  ; 
  ear, 
  crystalling 
  lens, 
  and 
  cerebellie 
  

   fold 
  showing, 
  (page 
  66.) 
  

  

  Fig. 
  6 
  — 
  Face 
  view 
  of 
  embryo, 
  at 
  a 
  little 
  later 
  period 
  than 
  

   shown 
  in 
  Fig. 
  5, 
  (page 
  66.) 
  

  

  Fig. 
  7— 
  Nearly 
  profile 
  view 
  of 
  embryo, 
  showing 
  the 
  rows 
  of 
  

   proto-vertebra^, 
  one 
  on 
  each 
  side 
  of 
  the 
  neural 
  

   arch 
  . 
  

  

  Fig. 
  8 
  — 
  Exoderm 
  cells, 
  (page 
  63.) 
  

  

  Fig. 
  9 
  — 
  Head 
  of 
  embryo, 
  showing 
  parts 
  of 
  brain 
  and 
  eye- 
  

   sacks, 
  (page 
  66.) 
  

  

  Fig. 
  10 
  — 
  Profile 
  view 
  of 
  brain, 
  much 
  enlarged, 
  (63.) 
  

  

  Fig, 
  11 
  a, 
  b, 
  c, 
  — 
  Ear 
  at 
  different 
  stages 
  of 
  development, 
  

   (pages 
  66-7.) 
  The 
  otoliths 
  are 
  not 
  represented. 
  

  

  Fig. 
  12 
  — 
  Face 
  view 
  of 
  head, 
  at 
  stage 
  represented 
  in 
  Fig. 
  4. 
  

  

  Fig. 
  13 
  a 
  — 
  Top 
  view 
  of 
  a 
  portion 
  of 
  the 
  dorsum 
  of 
  an 
  em- 
  

   bryo, 
  showing 
  proto 
  -vertebra) 
  on 
  each 
  side 
  the 
  

   neural 
  canal, 
  

   b 
  — 
  Cross 
  section 
  of 
  dor.'sum 
  of 
  embryo, 
  showing 
  

   cells 
  which 
  surround 
  the 
  notochord. 
  

  

  