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The island of Socotra lies off the north-east corner of Africa, in lat. 12° 19′ to 12° 42′, and long. 53° 20′ to 54° 30′. Its extreme length from east to west is about 72 miles, and its breadth about 22 miles. From Cape Guardafui 140 miles, it is a little more distant from the Arabian coast (about 500 miles from Aden), and still further away from the Indian Peninsula. It is the most easterly elevation of land on a coral bank lying to the north-east of Africa, upon which, between it and Cape Guardafui, other islands (Abd-al-Kuri, Kal Farun, Samneh and Darzi—known commonly as The Brothers—and Saboynea) of smaller size occur. On no part of this bank is the depth of water over 200 fathoms, but between it and the African coast is a channel reaching 500 fathoms. Around Socotra is a narrow coral reef.
page xxi note † Bonney, T. G.: On a Collection of Rock Specimens from Socotra, abstract in Proc. Roy. Soc, No. 221 (1882), pp. 145–148. Id.: On a Collection of Rock Specimens from the Island of Socotra, in Phil. Trans., 1883, pp. 273–294, with plates vi., vii.Google Scholar
page xxv note * See, besides general accounts mentioned in note on page xxi:— Georg Schweinfurth : Das Volk von Socotra, in Unsere Zeit., 1883, pp. 657–669. Hunter, F. M.: Notes on Socotra, in Journal of the Anthropological Institute, vii. (1877), pp. 364–372.Google Scholar
page xxvi note * Hunter, F. M. : An account of the British Settlement of Aden in Arabia. London, Trübner and Co., 1877, p. 158.Google Scholar
page xxvii note * I am indebted to Major Hunter's Manuscript Journal, which he very kindly placed at my disposal, for the information which is quoted from him.
page xxvii note * Sclater, P. L. and Hartlaub, G. : On the Birds collected in Socotra by Prof. I. B. Balfour, in Proc Zool. Soc, January 18, 1881, pp. 165–175, with plates xv.–xvii. Dr Hartlaub's account of the birds collected by the German expedition will be found in Proc. Zool. Soc., London, 1881, p. 953.Google Scholar
page xxvii note † A. Giünther: Description of the Amphisbænians and Ophidians collected by Prof. I. Bayley Balfour in the Island of Socotra, in Proc. Zool. Soc., April 5, 1881, pp. 441–463, with plates xl. and xli.
page xxvii note ‡ Blandford, W. T.: Notes on the Lizards collected in Socotra by Prof. I. Bayley Balfour, in Proc. Zool. Soc., April 5, 1881, pp. 464–469, with plate xlii.Google Scholar
page xxxii note * Godwin-Austen, H. H. : On the Land-Shells of the Island of Socotra, collected by Prof. Bayley Balfour,—Part I. Cyclostomaceæ, in Proc. Zool. Soc., Feb. 1, 1881, pp. 351–258, with plates xxvii. and xxviii. ; and Part II. Helicacea, in Proc. Zool. Soc., June 21, 1881, pp. 802–812, with, plates lxviii. and lxix.Google Scholar
page xxxii note ‡ Godwin-Austen, H. H.: On the Fresh-water Shells of the Island of Socotra, collected by Prof. Bayley Balfour, in Proc. Zool. Soc., January 16, 1883, pp. 2–8, with plates i. and ii.Google Scholar
page xxxiii note * Martens, E. von: Land Schnecken von Sokotra, in Nachrichtsbl. d. deutsch. Malekol. Gesellschaft, No. 10 (1881);—Id.: Mollusken von Sokotra, Conchologische Mittheilungen, Bd. ii. pp. 140–152, tt. 28–29.Google Scholar
page xxxiii note † Butler, A. G.: On the Lepidoptera collected in Socotra, by Prof. I. B. Balfour, in Proc. Zool. Soc., January 18, 1881, pp. 175–180, with plate xviii.Google Scholar
page xxxviii note * For explanations of this term see Appendix, note under page 292.
page xlix note * Species of endemic genera are printed in italics.
page lvi note * Indicates large distribution in temperate regions.