﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS, 
  VOL. 
  67, 
  ART. 
  19 
  PL. 
  I 
  

  

  pv 
  J 
  

  

  Wfi 
  

  

  , 
  v 
  

  

  V 
  

  

  Series 
  Illustrating 
  Multiple 
  Tubular 
  Tongues, 
  Modifications 
  of 
  a 
  

   Generalized 
  Type 
  Pattern. 
  (X3) 
  

  

  For 
  explanation 
  of 
  plate 
  see 
  page 
  5 
  

  

  