﻿GEOL. 
  SOC. 
  AM., 
  MEMOIR 
  76 
  

  

  PALMEE, 
  PL. 
  27 
  

  

  ATYS, 
  MANGELIA, 
  PALLOCIIITON, 
  CYANOPLAX, 
  AND 
  MOPALIA 
  

  

  