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Show 1874.] ON FOSSIL ARVICOLIDJE. 461 (as Prince Bonaparte and M . Pomel), who have attributed specific value to slight cranial differences. In accordance with these views we have thought it necessary considerably to reduce the number of recorded species. Remains of Arvicolida have been found in the upper beds of the Norwich Crag series, in the breccia of the Mediterranean islands, in brick-earths and other deposits of the Drift period, and in many bone-caves in England, France, Belgium, Germany, and Italy. When not identical with the species now inhabiting these countries, they show affinity, as might be expected, with North-European and Siberian forms; and the two species of restricted Myodes, in particular, are very characteristic of the glacial fauna of which they were members. Before proceeding to the enumeration of the species, we have to express our best thanks to those who have assisted us with information and the loan of specimens, especially to the Committee of the Norfolk and Norwich Museum, to Sir Charles Lyell and Prof. Owen, Messrs. Boyd Dawkins and Sanford, Mr. Moore, of Bath, Messrs. Southwell, Harmer, and Reeve, of Norwich, and Mr. Bidgood, of Taunton. I. ARVICOLA GLAREOLUS (Schreber). 1846. Arvicolapratensis, Owen, Br. Foss. M a m m . p. 208, fig. 78. 1852 (?). Arvicola delarbrei (sp. n.), Pomel, Ann. Sc. de 1'Au-vergne, xxv. p. 362. 1855. Arvicola glareolus, Hensel, Zeits. d. Deutsch. Geol. Ges. vii. p. 483. 1866. Arvicola pratensis, Boyd Dawkins & Sanford, Pleistoc. M a m m . (Introd.) p. xxxvi. 1869. Arvicola pratensis, Boyd Dawkins, Q. J. Geol. Soc. xxv. p. 194. 1870. Arvicola glareolus, Sanford, ibid. xxvi. p. 124. The Red Field-Vole was first noticed as a fossil species by Prof. Owen, under Baillon's name of A. pratensis, some remains obtained by Mr. McEnery from Rent's Hole, now in the British Museum, having been identified by Mr. Waterhouse. M. Pomel's A. delarbrei, from the Breche de Coudes, is stated to be a little larger than A. glareolus, and to differ slightly in the details of the molars ; but these are points in which individual variations are constantly found in the recent animal. The species appears to have been rare in England in Pleistocene times; Mr. Boyd Dawkins added no new localities; and Mr. Sanford had only seen two jaws, one of which, from Hutton Cave, is in the Taunton Museum. Mr. C. Moore has found a detached first lower molar in a cavern near Bristol; we have a jaw from Wookey Hole in our own collection; and a fragmentary jaw and some separate teeth from the Norfolk forest-bed series are in the Norwich Museum. A. glareolus has a recent European range north of the Alps and Apennines, extending to within the Arctic Circle and to the Ural |