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NOTES
[1] The degeneration of the hind-limb in Whales and Sirenia forbids the use of this character as a distinctive one on the principles advocated by the selection of the above list. But it would be absurd to leave out hair.
[2] "Über die Haare der Säugethiere," Morph. Jahrb. xxi. 1894, p. 312.
[3] "Bemerkungen über den Ursprung der Haare," Anat. Anz. 1893, p. 413.
[4] See for this matter, p. [90]. Dr. Bonavia has recently advanced (Studies in Evolution, London, 1895) the somewhat fantastic view that the pigment-patches of Carnivorous and other mammals are a reminiscence of an earlier scaly condition. There is no direct evidence that the primitive mammals were scaly, nor are the Monotremata or Marsupials furnished with any more traces of such a condition than are other mammals; and they are the most lowly organised of existing Mammalia.
[5] Proc. Zool. Soc. 1887, p. 527.
[6] "Über Marsupialrudimente bei Placentaliern," Morph. Jahrb. xx. 1893, p. 276.
[7] See Haacke, "On the Marsupial Ovum, the Mammary Pouch, etc., of the Echidna," Proc. Roy. Soc. 1885, p. 72; and "Über die Entstehung der Säugetiere," Biol. Centralbl. viii. 1889, p. 8.