1874.] 



ON FOSSIL ARVICOLID.E. 



Fig. 3. 



469 



Teeth of A. arvalis. 



and in the bone-breccia of Oliveto, near Pisa) to A. arvalis, we have 

 thought it best provisionally to apply the same name to the Bath 

 fossils. 



This is the commonest species of Field- Vole in Central Europe 

 extending into Western Siberia, and, according to Radde, even as 

 far east as the desert of Gobi. It is not found in Scandinavia, nor 

 in Britain, and in Italy it appears to be confined to the northern 

 provinces, being replaced in the former countries by A. agrestis, and 

 in the south of Italy by A. savii. 



The dentition varies slightly, the pattern being : — 

 Upper I. 5 spaces, 6 angles. Lower I. 8 spaces, 9 angles. 

 n - 4 „ 5 „ „ II. 5 „ 6 



» ni. e „ 7 „ „ in. 3 ;; 5 ;; 



We have compared the fossils with recent skulls in the British 

 Museum and in our own collection. 



8. Myodes torquatus, Pall. 



1852. (l)Arvicola ambiguus, Pomel, Ann. Sc. de l'Auverene 

 xxv. p. 363 (nee Hensel). 5 ' 



1855. Misothermus torquatus, Hensel, Zeits. d. Deutsch Geol 

 Ges. vii. p. 492, pi. xxv. figs. 12, 13. 



1864. Lemmus grcenlandicust, Blackmore, ap. Evans, Q. J. Geol. 

 Soc. xx. p. 192. 



1866. Lemmus, sp., Boyd Dawkins & Sanford, Pleist. Mamm. 

 (Introd.) p. xxxvi. 



1869. Lemmus, sp., Boyd Dawkins, Q. J. Geol. Soc. xxv. p. 194. 



1870. Lemmus torquatus, var., Sanford, ibid. xxvi. p. 125 pi viii' 

 figs. 4, 4 a. i r • • 



1870. Arvicola gulielmi, sp. n., Sanford, ibid. xxvi. p. 125, pi viii 

 figs. 2 a, b. 



1873. Myodes torquatus, Forsyth Major, Atti Soc. Ital. Sc. Nat 

 xv. p. Ill, pi. 2. 



In 1852 M. Pomel described Arvicola ambiguus, a new species 



