﻿Spirifer 
  iheringi 
  Kayser 
  

   (See 
  plate 
  25) 
  

  

  Fig. 
  1, 
  2 
  Dorsal 
  aspects 
  of 
  internal 
  casts 
  of 
  young 
  shells 
  

  

  3 
  Front 
  view 
  of 
  conjoined 
  valves 
  of 
  a 
  mature 
  individual 
  

  

  4 
  Enlargement 
  of 
  surface 
  in 
  a 
  mature 
  valve 
  

  

  5 
  A 
  mature 
  dorsal 
  valve 
  

  

  6 
  Dorsal 
  view 
  of 
  a 
  characteristic 
  internal 
  cast 
  

  

  7, 
  8 
  The 
  cardinal 
  process 
  in 
  different 
  stages 
  of 
  development 
  

   Locality: 
  Tybagy, 
  state 
  of 
  Sao 
  Paulo, 
  Brazil 
  

  

  188 
  

  

  

  