﻿312 
  

  

  RANID^J. 
  

  

  which 
  float 
  on 
  the 
  water.* 
  The 
  number 
  of 
  eggs 
  

   varies 
  according 
  to 
  the 
  size 
  of 
  the 
  female 
  ; 
  L. 
  Greening 
  

  

  Fig. 
  113. 
  

  

  has 
  counted 
  from 
  1500 
  to 
  2500, 
  and 
  Heron-Royer 
  from 
  

   2856 
  to 
  4005. 
  Greening's 
  results 
  agree 
  better 
  with 
  

   my 
  own, 
  as 
  I 
  have 
  counted 
  1155, 
  1188, 
  1584, 
  1744, 
  and 
  

   2044. 
  The 
  embryo, 
  on 
  liberation, 
  is 
  of 
  a 
  dark 
  brown, 
  

   nearly 
  black, 
  with 
  a 
  well-developed 
  tail, 
  and 
  dark 
  

   brown, 
  branched 
  external 
  gills, 
  which 
  soon 
  acquire 
  a 
  

   large 
  size. 
  

  

  Tadpole 
  (PI. 
  Ill, 
  fig. 
  3). 
  — 
  Length 
  of 
  body 
  once 
  and 
  

   a 
  half 
  to 
  once 
  and 
  two-thirds 
  its 
  width, 
  one-half 
  to 
  

   two-thirds 
  the 
  length 
  of 
  the 
  tail. 
  Nostrils 
  equally 
  

   distant 
  from 
  the 
  eyes 
  and 
  the 
  end 
  of 
  the 
  snout, 
  or 
  a 
  

   little 
  nearer 
  the 
  latter. 
  

  

  Eyes 
  on 
  the 
  upper 
  surface, 
  a 
  little 
  nearer 
  the 
  end 
  

   of 
  the 
  snout 
  than 
  the 
  spiraculum 
  ; 
  the 
  distance 
  between 
  

   the 
  eyes 
  about 
  once 
  and 
  a 
  half 
  the 
  distance 
  between 
  

  

  * 
  Dr. 
  Ridewood 
  showed 
  me 
  in 
  March, 
  1897, 
  a 
  mass 
  of 
  eggs 
  that 
  had 
  

   been 
  laid 
  by 
  a 
  moderate-sized 
  frog. 
  These 
  eggs 
  were 
  exceptionally 
  

   small, 
  the 
  vitellns 
  measuring 
  rather 
  less 
  than 
  2 
  mm., 
  and 
  some 
  of 
  them 
  

   formed 
  a 
  regular 
  string, 
  in 
  a 
  single 
  file, 
  4 
  cm. 
  in 
  length, 
  closely 
  

   resembling 
  the 
  eggs 
  of 
  a 
  toad. 
  I 
  have 
  preserved 
  a 
  portion 
  of 
  these 
  

   abnormal 
  eggs 
  in 
  spirit, 
  and 
  they 
  are 
  now 
  in 
  the 
  collection 
  of 
  the 
  

   British 
  Museum. 
  

  

  