﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  PROCEEDINGS. 
  VOL. 
  103, 
  PLATE 
  12 
  

  

  ^ 
  

  

  r 
  tjifitf'iit" 
  I 
  '^"•"^^^^ 
  

  

  D 
  

  

  For 
  explanation 
  see 
  facing 
  page. 
  

  

  