. Bulletin of the British Museum (Natural History), Geology. OF BRITISH ISLES 115 Localities : Crayford and Erith (27) : Hinton 1907a, b, 1910b, Barrett-Hamilton & Hinton 1910-21, Hinton 1926b, Kennard 1944, Jackson 1947, Chaline 1972, BM(NH). Clevedon Cave, Somerset (14) : Hinton 1907a, b, 1910b, Barrett-Hamilton & Hinton 1910-21, Hinton 1926b, Chaline 1972, BM(NH). Cow Cave, Chudleigh (7) : det. G. B. Corbet. Gough's Cave, Somerset (12) : BM(NH). Tornewton Cave (Glutton Stratum), Devon (3) : Kowalski 1967, BM(NH). Water Hall Farm Gravel Pit, Hertfordshire (38) : BM(NH). East Wickham,
. Bulletin of the British Museum (Natural History), Geology. OF BRITISH ISLES 115 Localities : Crayford and Erith (27) : Hinton 1907a, b, 1910b, Barrett-Hamilton & Hinton 1910-21, Hinton 1926b, Kennard 1944, Jackson 1947, Chaline 1972, BM(NH). Clevedon Cave, Somerset (14) : Hinton 1907a, b, 1910b, Barrett-Hamilton & Hinton 1910-21, Hinton 1926b, Chaline 1972, BM(NH). Cow Cave, Chudleigh (7) : det. G. B. Corbet. Gough's Cave, Somerset (12) : BM(NH). Tornewton Cave (Glutton Stratum), Devon (3) : Kowalski 1967, BM(NH). Water Hall Farm Gravel Pit, Hertfordshire (38) : BM(NH). East Wickham, Plumpstead, London : Hinton 1907b, 1926b, BM(NH). Some additional records of M. nivalis exist in early papers. This species has been mentioned from a cave in the Forest of Dean, from Fisherton, Grays Thurrock and Swanscombe. Hinton (1926b) did not mention these localities in his monograph as containing M. nivalis and no remains of the snow vole have been seen by the writers among material collected from these Fig. 27. Distribution of fossil remains of Microtus nivalis (Martins) in the British Isles. Distribution in the British Isles. M. nivalis seems to be a typical element of the fauna of the period represented by Crayford and the Tornewton Cave Glutton Stratum. There was a stage when the genus Microtus was represented in the British Isles by two species only, M. nivalis and M. oeconomus. It is entirely absent from Devensian localities in Britain. General distribution. M. nivalis is now distributed in mountain ranges, mostly in the Mediterranean area, from the Pyrenees in the west to Lebanon, the Caucasus and Kopet-Dag in the east. It inhabits treeless, mostly rocky or stony localities, not necessarily cold ones. During the Pleistocene it was more widely distributed. Systematic remarks. M. nivalis has a very variable tooth-pattern. Its presence in Britain is beyond doubt, but the existence of a second species from this group, M. malei, does not seem probable. The teet
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