﻿Spirifer 
  katzeri 
  Clarke 
  

  

  Fig 
  i, 
  2 
  View 
  of 
  a 
  dorsal 
  valve, 
  showing 
  the 
  elevation 
  of 
  the 
  fold 
  

   and 
  the 
  number 
  of 
  ribs 
  

   Locality: 
  Maecuru 
  sandstone, 
  Rio 
  Maecuru, 
  Para 
  

  

  Spirifer 
  contrarius 
  Clarke 
  

  

  Fig. 
  3, 
  4 
  Casts 
  of 
  dorsal 
  valves 
  showing 
  sharp, 
  distinct 
  ribs 
  and 
  

   broadly 
  concave 
  interspaces 
  

   Locality: 
  Ponta 
  Grossa, 
  Brazil 
  

  

  Spirifer 
  parana 
  Clarke 
  

  

  Fig. 
  5 
  A 
  dorsal 
  valve 
  with 
  few 
  broadly 
  rounded 
  ribs 
  

   6 
  A 
  crushed 
  specimen 
  with 
  similar 
  characters 
  

   Locality: 
  Ponta 
  Grossa, 
  Brazil 
  

  

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