[38] Phil. Trans. clxxviii. 1887, p. 463.
[39] Robinson, Studies Biol. Lab. Owens Coll. ii. 1890, p. 35.
[40] Beddard, Proc. Zool. Soc. 1900, p. 667.
[41] Wallace, The Geographical Distribution of Animals, 1876. Heilprin, The Distribution of Animals, Internat. Scientific Series, 1887. Beddard, A Text-book of Zoogeography, Cambridge Natural Science Manuals, 1895. Lydekker, Geographical History of Mammals, Cambridge Geographical Series, 1896. W. L. and P. L. Sclater, The Geography of Mammals, Kegan Paul and Co. 1899.
[42] This term is sometimes used in a wider sense; cf. vol. viii. p. 74.
[43] A series of papers in the Phil. Trans. for 1888-96, of which a useful abstract by Professor Osborn was published in the American Naturalist, 1898, p. 309; see also Cambr. Nat. Hist. viii. 1901, p. 303.
[44] Cf. vol. viii. p. 82.
[45] It may be necessary to exclude the Whales from the comparison.
[46] Dental Anatomy, 5th ed. 1898, p. 304.
[47] "On the Fossil Mammalia from the Stonesfield Slate," Quart. Journ. Micr. Sci. xxxv. 1894, p. 407.