﻿Zool. 
  1904. 
  

  

  Plate 
  IV. 
  

  

  iii 
  

  

  

  Orkney 
  Vole. 
  Microtus 
  orcadensis, 
  Millais. 
  

  

  Common 
  Field-Vole. 
  Microtus 
  agrestis. 
  

  

  Cf. 
  p. 
  -241. 
  

  

  