﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS, 
  VOL. 
  67. 
  ART. 
  21 
  PL, 
  28 
  

  

  7 
  »—- 
  - 
  — 
  l 
  "II- 
  * 
  Q 
  

  

  Lower 
  Cretaceous 
  Cyclostomatous 
  Bryozoa 
  

  

  For 
  explanation 
  of 
  plate 
  see 
  page 
  121 
  

  

  