1. Hinton, M. A. C., Proc. Geol. Assoc. London, 21, 489 (1910). Barrett-Hamilton, G. E. H., and Hinton, M. A. C., Ann. Mag. Nat. Hist., (8), 12, 361 (1913). Hinton, M. A. C., Monograph of the Voles and Lemmings (Microtinae), 226 (London, 1926).
2. Zeuner, F. E., The Pleistocene Period (London, 1959).
3. Jameson, H. L., J. Linn. Soc. (Zool.), 26, 465 (1898).
4. Corbet, G. B., Proc. Zool. Soc. London (in the press).
5. Davis, J. L., Ann. Mag. Nat. Hist. (13), 1, 97 (1958).