[45] See Newport, Phil. Trans., 1832.
[46] Linnean Transactions, 1862.
[47] Origin of Species, 4th ed., pp. 14 and 97.
[48] On the Alternation of Generations. By J. J. Steenstrup. Trans. by C. Busk, Esq. Ray Society. 1842.
[49] Zeit. für Wiss. Zool. 1863.
[50] Mém. de l’Acad. Imp. de St. Pétersbourg. vol. xv. 1870.
[51] Of course all animals in which the sexes are distinct are in one sense dimorphic.
[52] “There is no such thing as a true case of ‘alternation of generations in the animal kingdom;’ there is only an alternation of true generation with the totally distinct process of gemmation or fission.”—Huxley on Animal Individuality, Ann. and Mag. of Nat. Hist. June 1852.
[53] Prince Hohenstiel Schwangau, p. 68.
[54] Journal of the Royal Institution. April 1873.