﻿GEOL. 
  SOC. 
  AM., 
  MEMOIR 
  76 
  

  

  PALMER, 
  PL. 
  20 
  

  

  ..■M/;.. 
  26 
  

  

  BARLEEIA, 
  TACHYRHYNCHUS, 
  TURRITELLA, 
  CAECUM, 
  MICRANELLUM, 
  ALABINA, 
  

   PETALOCONCHUS, 
  ALVANIA, 
  CERITHIDEA, 
  DIASTOMA, 
  OPALIA, 
  AND 
  EPITONIUM 
  

  

  