[Footnote 16: _Foraminifera_, preface, p. x.]
[Footnote 17: _United States Geological Survey of the Territories_, 1874.]
[Footnote 18: _Proceedings of the Entomological Society of London_, 1875, p. vii.]
[Footnote 19: _Ann. des Sci. Nat._, tom. xvi. p. 50.]
[Footnote 20: See _Winter Birds of Florida_, p. 206, Table F.]
[Footnote 21: See Table I, p. 211, of Allen's _Winter Birds of Florida_.]
[Footnote 22: _Proc. Zool. Soc._, 1864, p. 64.]
[Footnote 23: J.A. Allen, on Geographical Variation among North American Mammals, _Bull. U.S. Geol. and Geog. Survey_, vol. ii. p. 314 (1876).]
[Footnote 24: _Proc. Zool. Soc. Lond._, 1864, p. 700, and 1868, p. 28.]
[Footnote 25: See _Trans. Entomological Society of London_, 1887, p. 24.]
[Footnote 26: _Nature_, vol. xix. p. 554.]
[Footnote 27: _Nature_, vol. xvi. p. 163; and vol. xi. p. 227.]
[Footnote 28: _Ibid._, vol. xxxi. (1885), p. 533.]
[Footnote 29: _Nature_, vol. xxvi. p. 81.]
[Footnote 30: _Animals and Plants under Domestication_, vol. ii. p. 258.]
