﻿DISCOGLOSSUS. 
  139 
  

  

  Eggs. 
  — 
  Small, 
  1 
  to 
  1^ 
  mm. 
  in 
  diameter, 
  dark 
  brown 
  

   or 
  black, 
  with 
  the 
  lower 
  third 
  or 
  fourth 
  white 
  or 
  grey, 
  

   in 
  isolated 
  capsules 
  measuring 
  

   not 
  more 
  than 
  3 
  or 
  4 
  mm. 
  in 
  r^ 
  ^§^)^f?^(^f^ 
  r\ 
  

   diameter. 
  The 
  number 
  of 
  eggs 
  

   does 
  not 
  seem 
  ever 
  to 
  exceed 
  ^^^- 
  ^^• 
  

  

  1000, 
  and 
  may 
  be 
  as 
  few 
  as 
  300. 
  Eclosion 
  takes 
  place 
  

   on 
  the 
  second 
  to 
  sixth 
  day. 
  The 
  embryo, 
  which 
  then 
  

   measures 
  3 
  or 
  4 
  mm., 
  is 
  blackish-brown 
  ; 
  it 
  has 
  a 
  very 
  

   short 
  tail, 
  but 
  the 
  external 
  gills 
  have 
  not 
  yet 
  appeared. 
  

  

  Tadpole 
  (PL 
  I, 
  fig. 
  1). 
  — 
  Length 
  of 
  body 
  once 
  and 
  

   two-thirds 
  its 
  width, 
  one-half 
  to 
  two-thirds 
  the 
  length 
  

   of 
  the 
  tail. 
  Eyes 
  on 
  the 
  upper 
  surface 
  of 
  the 
  body, 
  

   the 
  distance 
  between 
  them 
  about 
  once 
  and 
  a 
  half 
  the 
  

   distance 
  between 
  the 
  nostrils, 
  equal 
  to 
  or 
  slightly 
  less 
  

   than 
  the 
  width 
  of 
  the 
  mouth. 
  Spiraculum 
  in 
  the 
  

   mid- 
  ventral 
  line, 
  equally 
  distant 
  from 
  either 
  extremity 
  

   of 
  the 
  body. 
  Anal 
  opening 
  median, 
  larger 
  than 
  the 
  

   spiraculum. 
  Tail 
  three 
  to 
  four 
  times 
  as 
  long 
  as 
  deep, 
  

   broadly 
  rounded 
  at 
  the 
  end, 
  both 
  upper 
  and 
  lower 
  

   crests 
  but 
  very 
  feebly 
  convex, 
  the 
  former 
  not 
  extending 
  

   upon 
  the 
  back 
  ; 
  the 
  depth 
  of 
  the 
  muscular 
  part 
  at 
  its 
  

   base 
  one-half 
  to 
  two-thirds 
  the 
  total 
  depth. 
  

  

  Mouth 
  elliptical. 
  Beak 
  white, 
  edged 
  with 
  black. 
  

   Lips 
  bordered 
  by 
  a 
  single 
  series 
  of 
  papillae, 
  which 
  are 
  

   usually 
  narrowly 
  interrupted 
  in 
  the 
  middle 
  of 
  the 
  

   upper 
  lip 
  ; 
  a 
  well-marked 
  chink 
  on 
  each 
  side 
  of 
  the 
  

   lower 
  lip. 
  Series 
  of 
  labial 
  teeth 
  -|, 
  occupying 
  the 
  

   whole 
  width 
  of 
  the 
  lips, 
  the 
  third 
  lower 
  interrupted 
  

   in 
  the 
  middle; 
  the 
  first 
  upper 
  and 
  the 
  first 
  lower 
  series 
  

   formed 
  of 
  one 
  or 
  two 
  rows 
  of 
  teeth, 
  the 
  others 
  con- 
  

   stantly 
  of 
  two. 
  

  

  The 
  ordinary 
  lines 
  of 
  crypts 
  on 
  the 
  head 
  are 
  dis- 
  

   tinguishable, 
  and 
  often 
  also 
  one 
  running 
  along 
  each 
  

   side 
  of 
  the 
  back. 
  

  

  Brown 
  or 
  olive 
  above, 
  grey 
  or 
  whitish 
  below, 
  

   speckled 
  w^ith 
  gold 
  ; 
  caudal 
  crests 
  w^hitish, 
  uniform 
  or 
  

   with 
  small 
  brown 
  dots. 
  Colour-dimorphism 
  is 
  dis- 
  

   cernible 
  some 
  time 
  before 
  the 
  egress 
  of 
  the 
  fore 
  limbs 
  ; 
  

  

  