442 MURIDZ—AGRESTIS 
Muck have been for a very long period separated from each other, and 
that Muck has been in connection with the mainland more recently 
than most of the other islands. 
THE COMMON GRASS MOUSE. 
MICROTUS HIRTUS (Bellamy). 
MICROTUS HIRTUS HIRTUS (Bellamy). 
1769. MUS TERRESTRIS, John Berkenhout, Oz¢/ines of the Natural History of Great 
Britain and Ireland, i., 5 (part); not Mus terrestris of Linnzeus (1758)=Arvicola 
terrestris. 
1807. MUS ARVALIS, W. Turton, British Fauna, 12 (part); Bingley ; Donovan ; not 
Mus arvalis of Pallas, 1778. 
1828. ARVICOLA AGRESTIS, John Fleming, A History of British Animals, 23 (part) ; 
Yarrell, Proc. Zool. Soc., London, 1832, 109; Jenyns; Bell, edd. 1 and 2; 
MacGillivray ; de Sélys-Longchamps; Owen; Morris, Cat. Brit. Foss. ed. 2, 
1854, 357; Sanford, Quart. Journ. Geol. Soc., xxvi., 1870, 124; Blackmore and 
Alston ; Lydekker, Caz. Foss. Mamm. Brit. Mus., \., 232; Flower and Lydekker ; 
Winge; Lataste, Le Maturaliste, 15th October 1883, 349. 
1839. ARVICOLA HIRTA, J. C. Bellamy, Matural History of South Devon, 373; 
described from Yealmpton, Devonshire, England. 
1841. ARVICOLA ARVALIS, Leonard Jenyns, 42. and Mag. Nat. fist., June 1841, 
269 (part). 
1847. ARVICOLA BRITANNICUS, E. de Sélys-Longchamps, Revue Zoologique (Paris), 
307, October; described from England and Scotland ; also, A¢ti della Ottava 
Riunione degli Sci. Ital. (Genoa, 1846), 495, 1847. 
1857. ARVICOLA AGRESTIS (b.), ARVICOLA NEGLECTA, J. H Blasius, Sdugethiere 
Deutschlands, 369 (part) 
1883. MICROTUS AGRESTIS, A. Smith Woodward and C. D. Sherborn (part) ; 
Lydekker ; Barrett-Hamilton, Proc. Zool, Soc., London, 1896, 602 ; Aflalo ; Johnston ; 
Thomas, Zoologist, 1898, 264; Millais; Pycraft, Gude to British Vertebrates ; 
Trouessart. 
1896. MICROTUS AGRESTIS NEGLECTUS ; G. E. H. Barrett-Hamilton, P7oc. Zool. Soc., 
London, 602 (part) ; Trouessart (part), 
1912. MICROTUS AGRESTIS HIRTUS, G. S. Miller, Catalogue of the Mammals of 
Western Europe, 673. 
1913. MicRoTUS HIRTUS, G. E. H. Barrett-Hamilton and M. A. C. Hinton, Pree. 
Zool. Soc., London, 834. 
Le Canpagnol of the French; Dze Erdmaus of the Germans. 
The synonymy is that of the British form of JZ. Azvtus. The older 
names, having been applied before segregation had taken place, include 
more than one form. The use of the specific name avvalis is due to 
confusion with the common continental species of that name, and 
britannicus arose from the same error, de Sélys-Longchamps having 
believed his drztannicus to be the British representative of arvalis, with 
which alone he compared it. There can be no doubt about the applica- 
tion of the word /zrtus, once the south British Grass Mouse is accepted 
as a distinct form. 
