﻿506 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [18] 
  

  

  egg 
  of 
  this 
  species 
  is 
  also 
  very 
  much 
  smaller 
  than 
  that 
  of 
  the 
  shad, 
  and 
  

   as 
  the 
  zona 
  invests 
  the 
  vitellns 
  or 
  embryo 
  quite 
  closely, 
  there 
  is 
  no 
  

   spacious 
  breathing 
  chamber 
  developed 
  at 
  the 
  time 
  of 
  impregnation, 
  as 
  

   in 
  the 
  egg 
  of 
  the 
  shad. 
  

  

  Fig. 
  8, 
  plate 
  ii, 
  represents 
  a 
  larval 
  Glupea 
  vernalis 
  on 
  the 
  second 
  day 
  

   after 
  hatching, 
  when 
  it 
  measures 
  very 
  nearly 
  5 
  mm 
  in 
  length. 
  It 
  is 
  ex- 
  

   tremely 
  transparent, 
  the 
  only 
  ornamentation 
  with 
  pigment 
  spots 
  is 
  a 
  

   row 
  of 
  small 
  ones 
  on 
  either 
  side 
  of 
  the 
  tail, 
  on 
  a 
  level 
  with 
  the 
  lower 
  

   side 
  of 
  the 
  intestine. 
  The 
  yelk 
  is 
  very 
  clear 
  and 
  does 
  not 
  contain 
  any 
  

   oil 
  drops. 
  The 
  liver 
  is 
  produced 
  as 
  a 
  nearly 
  solid, 
  elongated 
  outgrowth 
  

   from 
  the 
  inferior 
  side 
  of 
  the 
  intestine 
  and 
  behind 
  the 
  yelk 
  sack, 
  in 
  the 
  

   same 
  position 
  as 
  in 
  Glupea 
  sapidissima. 
  The 
  liver 
  is 
  represented 
  in 
  the 
  

   figure 
  by 
  the 
  long 
  black 
  patch 
  behind 
  the 
  yelk 
  sack. 
  It 
  will 
  also 
  be 
  

   noticed 
  that 
  the 
  intestine 
  terminates 
  very 
  far 
  back, 
  as 
  it 
  does 
  in 
  fact 
  

   in 
  most 
  Clupeoids. 
  35 
  

  

  IV. 
  — 
  Idus 
  melanotus. 
  {The 
  Golden 
  Ide.) 
  

  

  The 
  ova 
  of 
  this 
  beautiful 
  cyprinoid 
  are 
  adhesive, 
  and, 
  like 
  those 
  of 
  

   the 
  gold-fish, 
  are 
  usually 
  found 
  to 
  adhere 
  singly 
  to 
  the 
  water-plants 
  

   amongst 
  which 
  the 
  parent 
  fishes 
  spawn. 
  The 
  zona 
  radiata 
  is 
  rather 
  

   thick, 
  and 
  there 
  is 
  but 
  little 
  space 
  between 
  it; 
  and 
  the 
  vitellns. 
  

  

  The 
  young 
  golden 
  ide 
  when 
  it 
  leaves 
  the 
  egg 
  measures 
  6.6' 
  mu 
  in 
  length. 
  

   Its 
  form 
  at 
  that 
  time 
  is 
  shown 
  in 
  fig. 
  9, 
  plate 
  ii. 
  The 
  Cuvierian 
  ducts 
  

   embrace 
  the 
  anterior 
  end 
  of 
  the 
  yelk, 
  which 
  is 
  composed 
  of 
  small 
  

   spherical 
  refringent 
  granules. 
  The 
  yelk 
  sack 
  is 
  much 
  prolonged, 
  and 
  

   extends 
  from 
  the 
  cardiac 
  region 
  nearly 
  to 
  the 
  vent, 
  tapering 
  slightly 
  

   as 
  it 
  is 
  prolonged 
  backwards. 
  As 
  in 
  cyprinoids 
  generally, 
  there 
  is 
  a 
  

   complete 
  circulation 
  at 
  the«tiine 
  of 
  hatching, 
  which 
  is 
  not 
  the 
  case 
  with 
  

   the 
  embryos 
  of 
  several 
  clupeoids 
  and 
  many 
  forms 
  having 
  pelagic 
  eggs. 
  

   The 
  figures 
  given 
  by 
  Von 
  Baer 
  of 
  the 
  embryos 
  of 
  other 
  forms 
  of 
  cypri- 
  

   noids 
  also 
  show 
  the 
  yelk-sack 
  to 
  be 
  elongated. 
  (See 
  his 
  Untersuchungen 
  

   fiber 
  die 
  Entwickelungsgeschichte 
  der 
  Fische, 
  4to, 
  Leipzig, 
  1835.) 
  

  

  V.— 
  Caeassitjs 
  auratus. 
  {The 
  Gold-fish.) 
  

  

  The 
  ova 
  of 
  the 
  common 
  gold-fish 
  are 
  laid 
  singly 
  upon 
  weeds 
  and 
  other 
  

   fixed 
  objects 
  in 
  the 
  water. 
  They 
  measure 
  about 
  1.5 
  mm 
  in 
  diameter, 
  and 
  

   develop 
  with 
  comparative 
  rapidity, 
  hatching 
  in 
  8 
  or 
  9 
  days 
  after 
  fertil- 
  

   ization. 
  Three 
  of 
  the 
  earlier 
  stages 
  of 
  the 
  development 
  of 
  this 
  form 
  

   are 
  shown 
  in 
  figs. 
  16, 
  17, 
  and 
  18, 
  plate 
  iii. 
  The 
  yelk 
  is 
  quite 
  gran- 
  

   ular 
  and 
  similar 
  to 
  that 
  of 
  Idus 
  and 
  Leuciscus 
  (Van 
  Bambeke 
  30 
  ), 
  and 
  the 
  

   embryonic 
  axis 
  embraces 
  almost 
  the 
  entire 
  circumference 
  of 
  the 
  vitellus, 
  

  

  36 
  Filippo 
  cle 
  Filippi. 
  Nouvelles 
  reclierches 
  sur 
  l'euibryogenie 
  des 
  Poissous, 
  Aim. 
  des 
  

   Sci. 
  Nat, 
  3 
  ,ne 
  Ser. 
  Zool., 
  vii, 
  1847, 
  pp. 
  65-72, 
  1 
  plate. 
  (Figures 
  the 
  larva 
  of 
  Clupea 
  finta. 
  ) 
  

  

  36 
  Van 
  Bambeke. 
  Reclierches 
  sur 
  l'embryologie 
  des 
  Poissons 
  Osseux. 
  Mem. 
  Coiir. 
  

   de 
  l'Acad. 
  ray. 
  de 
  Belgique, 
  XL, 
  1875, 
  PI. 
  II. 
  

  

  