Mallet, R.--Some Remarks upon the Movements of Post-tertiary and other Discontinuous Masses, "Journal Geol. Soc. Dublin," vol. v., 1850-53. Merriam, C. H.--The Geographic Distribution of Life in North America, "Proc. Biological Soc. Washington," vol. vii., 1892. Murray, Andrew.--"The Geographical Distribution of Mammals," 1866. Nathorst, A. G.--Kritische Bemerkungen über die Geschichte d. Vegetation Grönlands, "Botanische Jahrbücher," vol. xiv., 1891. Nehring, A.--"Tundren und Steppen der Jetzt und Vorzeit," 1890. Neumayr, M.--"Erdgeschichte," vol. ii., 1887. Ogilvie, W. R. Grant.--"Game Birds," 1895. Penck, A.--Die grosse Eiszeit, "Himmel und Erde." Petersen, W.--Die Lepidopterenfauna d. arktisch. Gebiete von Europa, "Beiträge z. Kenntniss d. Russ. Reichs," vol. iv., 1888. Pettersen, K.--Arktis, "Arch. f. Math. og Naturvid.," 1882. Pohlig, H.--Dentition und Kraniologie des Elephas antiquus (part 2), "Nova Acta Acad. Carol.-Leop.," vol. liii., 1889. Reade, Mellard--=a.= The Present Aspects of Glacial Geology, "Geological Magazine," vol. iii., 1896. =b.= High Level Shelly Sands and Gravels, "Natural Science," vol. iii., 1893. Reid, C.--The Pliocene Deposits of Britain, "Mem. Geol. Survey of the United Kingdom," 1890. Rütimeyer, L.--"Die Herkunft unserer Thierwelt," 1867. Sars, G. O.--Crustacea Caspica, "Bull. Acad. Imp. d. Sciences St. Petersburg," vol. xiii., 1893-94. Scharff, R. F.--=a.= On the Origin of the European Fauna, "Proc. Royal Irish Acad." (3rd. ser.), vol. iv., 1897. =b.= Some Remarks on the Distribution of British Land and Freshwater Mollusca, "Conchologist," vol. ii., 1893. =c.= Étude sur les mammifères de la Région Holarctique, "Mém. de la Soc. Zool. de France," vol. viii., 1894. Schulz, A.--"Grundzüge einer Entwicklungsgeschichte d. Pflanzenwelt Mittel-europas," 1894. Sharpe, R. Bowdler.--British Museum Catalogue (Birds). Simroth, H.--Eine Bearbeitung d. Russischen Nacktschnecken fauna, "Ann. Musée Zool. St. Petersburg," 1896. Sjögren, H.--Ueber das diluviale Aralo-Kaspische Meer und die nord-europäische Vereisung, "Jahrb. d. Kais. K. Geol. Reichsanstalt," vol. xl., 1890. Sollas, W. J.--On the Origin of Freshwater Faunas, "Trans. Royal Dublin Soc." (2nd ser.), vol. iii., 1884. Speyer, A. and A.--"Die Geographische Verbreitung der Schmetterlinge Deutschlands und der Schweiz," vol. i., 1858. Struckmann, C.--Ueber die Verbreitung d. Rennthiers, in d. Gegenwart, etc., "Zeitschr. d. deutsch. Geol. Gesell.," vol. iii., 1883. Suess, E.--"Das Antlitz der Erde," vol. i., 1892. Tcherski, J. D.--Das Janaland und die Neusibirischen Inseln, "Mém. Acad. Imp. St. Petersburg," vol. xl., 1892. Thomas, O., and Barrett-Hamilton, G. E. H.--The Irish Stoat distinct from the British species, "Zoologist," 1895. Wallace, A. R.--"Island Life," 2nd edit., 1892. Warming, E.--Ueber Grönlands Vegetation, "Botanische Jahrbücher," vol. x., 1888-89.