﻿Am. 
  Jour. 
  Sci., 
  Vol. 
  XLIX, 
  1895. 
  

  

  Plate 
  III. 
  

  

  K: 
  

  

  OA 
  ' 
  ' 
  

  

  a 
  b 
  

  

  

  Trinucleus 
  concentricus 
  Eaton. 
  

  

  1,2. 
  Cephala 
  of 
  young 
  individuals, 
  x 
  40. 
  

   3. 
  Pygidium 
  of 
  young 
  individual. 
  x 
  40. 
  

   4,5,6. 
  Appendages. 
  4, 
  x4; 
  5, 
  G, 
  xll. 
  

  

  