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  Plate 
  8.—MI0D0NTISCUS 
  AND 
  LUCINA 
  

   Figure 
  Page 
  

  

  1, 
  4, 
  5. 
  Miodontiscus 
  prolongatus 
  (Carpenter) 
  83 
  

  

  Syntype, 
  U.S.N.M., 
  No. 
  15472; 
  X 
  8. 
  

  

  2, 
  3, 
  6, 
  7. 
  Miodontiscus 
  prolongatus 
  (Carpenter) 
  83 
  

  

  Syntypes, 
  Redpath 
  Mus., 
  No. 
  2377. 
  Figs. 
  2, 
  6, 
  length, 
  4.5 
  mm. 
  ; 
  height, 
  5 
  mm. 
  ; 
  

  

  thickness, 
  2+ 
  mm. 
  ; 
  Figs. 
  3, 
  7, 
  length, 
  5 
  mm. 
  ; 
  height, 
  5 
  mm. 
  ; 
  thickness, 
  

  

  2+ 
  mm. 
  

  

  8-12. 
  Lucina 
  tenuisculpta 
  (Carpenter) 
  86 
  

  

  Holotype, 
  U.S.N.M., 
  No. 
  5244. 
  Length, 
  6 
  mm.; 
  height, 
  6 
  mm.; 
  thickness, 
  

  

  3-|- 
  mm. 
  

  

  