﻿U. 
  S. 
  B. 
  F.— 
  Doc. 
  804. 
  

  

  Plate 
  IV. 
  

  

  AN 
  INTERIOR 
  VIEW 
  OF 
  THE 
  SHELL 
  REPRESENTED 
  IN 
  PLATE 
  111. 
  

  

  It 
  shows 
  the 
  reverse 
  condition 
  of 
  the 
  ridge 
  and 
  valley, 
  and 
  also 
  the 
  position 
  of 
  the 
  pearl, 
  which 
  weighed 
  1 
  1 
  grains. 
  

   The 
  nacre 
  of 
  the 
  shell, 
  at 
  the 
  point 
  where 
  the 
  pearl 
  was 
  found, 
  is 
  clear. 
  A 
  shell 
  very 
  similar 
  to 
  this 
  one 
  was 
  

   found 
  in 
  the 
  right 
  chute 
  of 
  Grand 
  Island, 
  and 
  contained 
  a 
  10-grain 
  high-button 
  pearl, 
  but 
  was 
  stained 
  and 
  

   contained 
  mud. 
  The 
  shell 
  was 
  also 
  stained 
  at 
  the 
  point 
  where 
  the 
  pearl 
  was 
  found. 
  

  

  