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  INTRODUCTION. 
  

  

  Biifo 
  vulgaris 
  often 
  breed 
  in 
  the 
  same 
  place, 
  we 
  always 
  

   find 
  ttie 
  tadpoles 
  forming 
  distinct 
  colonies. 
  A 
  dip 
  of 
  

   the 
  net 
  will 
  secure 
  specimens 
  of 
  one 
  species 
  only. 
  

   Courtship 
  does 
  not 
  take 
  place 
  in 
  any 
  of 
  the 
  tailless 
  

  

  Fig. 
  25. 
  

  

  W 
  

  

  / 
  

  

  Pairs 
  in 
  embrace, 
  a. 
  Disco 
  glossus 
  pictus. 
  b. 
  Pelodytes 
  pundatiis. 
  

  

  Batrachians. 
  The 
  female 
  is 
  seized 
  by 
  the 
  first 
  comer, 
  

   and 
  when 
  he 
  has 
  once 
  secured 
  his 
  hold 
  he 
  will 
  remain 
  

   for 
  a 
  period 
  varying 
  between 
  a 
  few 
  minutes 
  and 
  

   several 
  days 
  in 
  possession 
  until 
  the 
  evacuation 
  of 
  the 
  

   ova, 
  unless 
  he 
  be 
  dislodged 
  by 
  a 
  stronger 
  competitor. 
  

  

  