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Show 1874.] ON FOSSIL ARVICOLID/E. 469 Fig. 3. 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. IL 4 „ 5 „ „ II. 5 „ 6 „ „ HI- 6 „ 7 „ „ III. 3 „ 5 „ W e have compared the fossils with recent skulls in the British Museum and in our own collection. 8. MYODES TORQUATUS, Pall. 1852. (1) Arvicola ambiguus, Pomel, Ann. Sc. de l'Auvergne, xxv. p. 363 (nee Hensel). 1855. Misothermus torquatus, Hensel, Zeits. d. Deutsch. Geol. Ges. vii. p. 492, pi. xxv. figs. 12, 13. 1864. Lemmus groenlandicusl, Blackmore, ap. Evans, Q. J. Geol. Soc. xx. p. 192. 1866. Lemmus, sp., Boyd Dawkins & Sanford, Pleist. M a m m. (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. 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 |