﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

   1 
  

  

  PROCEEDINGS, 
  VOL. 
  XX 
  PL. 
  LXXXVill 
  

   2 
  

  

  Deep 
  Sea 
  Bivalves. 
  

  

  For 
  EXPLANATiON 
  OF 
  PLATE 
  SEE 
  PAGE 
  893. 
  

  

  