﻿14 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  67 
  

  

  Plate 
  4 
  

  

  All 
  figures 
  X 
  50 
  diameters 
  

  

  Fig. 
  1. 
  " 
  Solenaia 
  " 
  falcata 
  Higgins. 
  At 
  the 
  posterior 
  dorsal 
  angle. 
  

  

  It 
  would 
  have 
  been 
  better 
  if 
  this 
  figure 
  could 
  have 
  been 
  arranged 
  

   to 
  have 
  the 
  striae 
  running 
  horizontally 
  and 
  the 
  growth 
  lines 
  on 
  a 
  

   slant. 
  Being 
  near 
  the 
  posterior 
  dorsal 
  margin, 
  the 
  striae, 
  which 
  

   radiate 
  from 
  the 
  beak, 
  are, 
  at 
  this 
  point, 
  nearly 
  parallel 
  to 
  the 
  dorsal 
  

   edge, 
  and 
  nearly 
  horizontal. 
  

  

  2. 
  Pleiodon 
  ovatus 
  Swainson. 
  Below 
  the 
  middle 
  of 
  the 
  posterior 
  dorsal 
  

  

  ridge. 
  

  

  3. 
  S2)dtha 
  icahlbergi 
  Krauss. 
  Posterior 
  to 
  the 
  center 
  of 
  the 
  disk. 
  

  

  o 
  

  

  