﻿Pleurodapis 
  multicincta 
  Clarke 
  

  

  Fig. 
  1,2 
  Right 
  and 
  left 
  valves 
  

  

  3 
  Sculpture 
  casts 
  of 
  conjoined 
  valves 
  with 
  suppression 
  of 
  

  

  some 
  of 
  the 
  posterior 
  ridges. 
  The 
  abscission 
  of 
  the 
  

   umbones 
  by 
  pressure 
  on 
  the 
  hinge-plates 
  is 
  noticeable 
  

   here, 
  as 
  on 
  the 
  succeeding 
  figures 
  

  

  4 
  The 
  hinge, 
  showing 
  anterior 
  muscle 
  scars 
  and 
  a 
  broad- 
  

  

  ened 
  platform 
  behind, 
  x 
  2 
  

   5, 
  6 
  Right 
  valves, 
  showing 
  considerable 
  divergence 
  in 
  the 
  de- 
  

   velopment 
  of 
  the 
  ridges 
  

   Locality: 
  Ponta 
  Grossa, 
  Brazil 
  

  

  174 
  

  

  