﻿Chonetes 
  hallei 
  Clarke 
  

  

  Fig. 
  i 
  Internal 
  cast 
  of 
  conjoined 
  valves 
  

  

  Locality: 
  Spring 
  Point, 
  Falkland 
  islands 
  

  

  Schizobolus 
  truncatus 
  Hall 
  

  

  Fig. 
  2, 
  3 
  Brachial 
  and 
  pedicle 
  valves, 
  x 
  3 
  

  

  Locality: 
  Upper 
  Devonic 
  black 
  shale 
  of 
  Erere, 
  Para 
  

  

  Orbiculoidea 
  baini 
  (Sharpe) 
  

  

  Fig. 
  4, 
  5 
  Pedicle 
  valves, 
  exterior 
  and 
  interior 
  surfaces 
  

   6, 
  7 
  Pedicle 
  and 
  brachial 
  valves, 
  x 
  2 
  

  

  8 
  Enlargement 
  of 
  surface 
  of 
  pedicle 
  valve 
  

   Locality: 
  Ponta 
  Grossa, 
  Brazil 
  

  

  Orbiculoidea 
  bodenbenderi 
  Clarke 
  

  

  Fig. 
  9, 
  10 
  Brachial 
  valves 
  

  

  11 
  Pedicle 
  valve 
  

  

  12 
  Enlargement 
  of 
  surface 
  of 
  pedicle 
  valve 
  

   Locality: 
  Ponta 
  Grossa, 
  Brazil 
  

  

  