﻿RAN 
  A, 
  

  

  273 
  

  

  to 
  draw 
  up 
  the 
  following 
  key, 
  which 
  is 
  imperfect 
  only 
  

   in 
  so 
  far 
  that 
  Forms 
  2 
  and 
  3 
  are 
  not 
  distinguished 
  

   from 
  each 
  other 
  in 
  an 
  absolute 
  manner 
  ; 
  this 
  difficulty, 
  

   however, 
  cannot 
  be 
  overcome, 
  as 
  the 
  two 
  forms 
  do 
  

   run 
  completely 
  into 
  each 
  other, 
  and 
  future 
  investiga- 
  

   tions 
  may 
  even 
  render 
  their 
  separation 
  unadvisable. 
  

  

  Metatarsal 
  tubercle. 
  

   >r 
  fHeels 
  overlapping. 
  1. 
  ridibunda. 
  24-4a 
  +=_ 
  „? 
  9^-14 
  

  

  folds 
  1 
  I 
  Heels 
  ? 
  ofc 
  over 
  " 
  f 
  2 
  " 
  ^^ 
  

   ^ 
  lapping. 
  -! 
  3. 
  lessonse. 
  

  

  Dorsal 
  folds 
  14. 
  chinensis. 
  

  

  2-3 
  

   li-2 
  

  

  1-ifJ 
  

  

  £ 
  I 
  7-10 
  

  

  m 
  P 
  5-8 
  

  

  .§ 
  ^ 
  5-8J 
  

  

  03 
  O 
  

  

  The 
  fourth 
  form, 
  being 
  confined 
  to 
  Asia, 
  will 
  not 
  be 
  

   further 
  dealt 
  with 
  in 
  this 
  work. 
  

  

  Fig. 
  100. 
  

  

  Lower 
  views 
  of 
  feet 
  : 
  — 
  A. 
  Var. 
  ridibunda. 
  B. 
  Forma 
  typica. 
  

   C. 
  Var. 
  lessons. 
  D. 
  Var. 
  chinensis. 
  

  

  Yar. 
  RIDIBUNDA. 
  

  

  Inner 
  metatarsal 
  tubercle 
  small, 
  blunt, 
  feebly 
  pro- 
  

   minent, 
  its 
  length 
  2^ 
  to 
  4 
  times 
  in 
  the 
  length 
  of 
  the 
  

   inner 
  toe 
  measured 
  from 
  the 
  tubercle, 
  and 
  9^ 
  to 
  14 
  

   times 
  in 
  the 
  length 
  of 
  the 
  tibia; 
  when 
  the 
  limbs 
  are 
  

   folded 
  at 
  right 
  angles 
  to 
  the 
  rhachis 
  the 
  heels 
  over- 
  

   lap 
  ; 
  tibia 
  as 
  long 
  as, 
  or 
  slightly 
  shorter 
  than 
  the 
  foot 
  

   measured 
  from 
  the 
  outer 
  metatarsal 
  tubercle. 
  The 
  

   tibio-tarsal 
  articulation 
  reaches 
  the 
  eye, 
  the 
  tip 
  of 
  the 
  

  

  T 
  

  

  