﻿U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS, 
  VOL. 
  103, 
  PLATE 
  6 
  

  

  Sketches 
  of 
  living 
  specimens 
  of 
  the 
  four 
  Alaskan 
  triclad 
  species, 
  all 
  XIO: 
  1. 
  Phagocata 
  

   nivea; 
  2. 
  Polycelis 
  borealis; 
  3. 
  Dendrocoelopsis 
  piriformis, 
  striped 
  form; 
  4. 
  Dendrocoelop- 
  

   sis 
  alaskensis. 
  

  

  