﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS. 
  VOL. 
  96 
  PLATE 
  37 
  

  

  URECHIS 
  CAUPO 
  AND 
  COMMENSALS 
  

   FOR 
  EXPLANAXrON 
  SEE 
  PAGES 
  291-292 
  

  

  