﻿TADPOLES. 
  109 
  

  

  the 
  mouth 
  or 
  the 
  distance 
  between 
  the 
  

   nostrils 
  ; 
  usually 
  a 
  black 
  tubercle 
  on 
  the 
  

   upper 
  mandible 
  . 
  . 
  . 
  B. 
  agilis. 
  

  

  With 
  regard 
  to 
  size, 
  the 
  tadpoles 
  rank 
  as 
  follows 
  : 
  

  

  Maximum 
  length 
  

   on 
  record. 
  

   Millimetres. 
  

  

  1. 
  Pelohates 
  faseus 
  175 
  

  

  2. 
  ,, 
  cultripes 
  120 
  

  

  3. 
  Rana 
  escidenta 
  Ill 
  

  

  4. 
  Ahjtes 
  ohstetricans 
  90 
  

  

  5. 
  ,, 
  cisternasii 
  69 
  

  

  6. 
  Felodytes 
  piindatus 
  65 
  

  

  7. 
  Rana 
  agilis 
  59 
  

  

  8. 
  Bomhiiiator 
  igneiis 
  50 
  

  

  9. 
  Hyla 
  arbor 
  ea 
  ....... 
  49 
  

  

  10. 
  Rana 
  iberica 
  ........ 
  49 
  

  

  11. 
  ,, 
  grxca 
  48 
  

  

  12. 
  ,5 
  tem'^oraria 
  46 
  

  

  13. 
  Bombinator 
  pachypus 
  ..... 
  45 
  

  

  14. 
  Bufo 
  viridis 
  44 
  

  

  15. 
  Bana 
  latastii 
  44 
  

  

  16. 
  ,, 
  arvalis 
  43 
  

  

  17. 
  Discoglossus 
  pichis 
  33 
  

  

  18. 
  Bufo 
  vulgaris 
  32 
  

  

  19. 
  ,, 
  calamita 
  30 
  

  

  But 
  if 
  we 
  compare 
  the 
  maximum 
  length 
  of 
  the 
  tad- 
  

   pole 
  with 
  the 
  maximum 
  length 
  of 
  the 
  adult, 
  we 
  

   obtain 
  the 
  following 
  order 
  : 
  

  

  Maximum 
  

   length 
  of 
  adult 
  from 
  

   snout 
  to 
  vent. 
  

   Millimetres. 
  

  

  1. 
  Pelobates 
  fusctts 
  80 
  

  

  2. 
  Alytes 
  obstetricans 
  54 
  

  

  3. 
  ,, 
  cisternasii 
  40 
  

  

  4. 
  Pelobates 
  cultripes 
  88 
  

  

  5. 
  Pelodytes 
  imnctatus 
  .45 
  

  

  6. 
  Bombinator 
  iqneiis 
  50 
  

  

  