﻿KANA. 
  

  

  295 
  

  

  which 
  dissolves 
  much 
  more 
  rapidly 
  than 
  in 
  B. 
  tem- 
  

   poraria, 
  7 
  or 
  8. 
  These 
  eggs 
  number 
  from 
  1000 
  to 
  

   2000 
  according 
  to 
  Heron-Royer 
  ; 
  I 
  have 
  counted 
  

   1829, 
  1518, 
  and 
  1029 
  ; 
  they 
  form 
  one, 
  or 
  rarely 
  two 
  

   large 
  balls, 
  which 
  do 
  not 
  float 
  as 
  in 
  B. 
  temper 
  arm. 
  

   The 
  vitelline 
  sphere 
  is 
  black 
  above 
  and 
  whitish 
  below; 
  

   the 
  white 
  may 
  be 
  restricted 
  to 
  one-third 
  of 
  the 
  surface 
  

  

  Fig. 
  107. 
  

  

  or 
  extend 
  over 
  nearly 
  the 
  whole 
  of 
  the 
  lower 
  half; 
  I 
  

   have, 
  however, 
  observed 
  egg-masses 
  of 
  this 
  species 
  in 
  

   which 
  the 
  white 
  lower 
  spot 
  was 
  much 
  reduced, 
  nothing 
  

   but 
  the 
  smaller 
  size 
  distinguishing 
  them 
  from 
  those 
  of 
  

   B. 
  temporaria. 
  The 
  embryo 
  on 
  emerging 
  is 
  blackish- 
  

   brown, 
  and 
  provided 
  with 
  branched 
  external 
  gills, 
  which 
  

   are 
  smaller 
  than 
  in 
  B. 
  temporaria 
  and 
  less 
  strongly 
  

   pigmented. 
  

  

  Tadpole 
  (PI. 
  Ill, 
  fig. 
  2). 
  — 
  Intermediate 
  between 
  

   B. 
  esculenta 
  and 
  B. 
  temporaria. 
  In 
  its 
  labial 
  dentition 
  

   it 
  agrees 
  with 
  the 
  former, 
  the 
  series 
  of 
  teeth 
  being 
  

   usually 
  f 
  , 
  sometimes 
  -f 
  , 
  when 
  a 
  third 
  very 
  short 
  series 
  

   is 
  present 
  on 
  each 
  side 
  of 
  the 
  upper 
  lip. 
  Beak 
  whitish, 
  

   narrowly 
  edged 
  with 
  black. 
  Interocular 
  space 
  about 
  

   once 
  and 
  a 
  half 
  the 
  distance 
  between 
  the 
  nostrils, 
  

   which 
  equals 
  or 
  slightly 
  exceeds 
  the 
  width 
  of 
  the 
  

   mouth. 
  Tail 
  pointed, 
  rarely 
  somewhat 
  obtuse, 
  once 
  

   and 
  two-thirds 
  to 
  twice 
  the 
  length 
  of 
  the 
  body, 
  its 
  

   depth 
  about 
  one-third 
  its 
  length 
  ; 
  depth 
  of 
  the 
  muscular 
  

   part 
  not 
  quite 
  half 
  the 
  greatest 
  total 
  depth. 
  Lines 
  of 
  

   muciferous 
  crypts 
  distinct, 
  disposed 
  as 
  in 
  B. 
  agilis. 
  

  

  