[310] Vergl. Entw. Kopf. nackt. Amphibien, p. 101, 1838.
[311] I have not seen the companion volume on palæontological progression, Unters. ü. d. Entwickelungsgesetze der organischen Welt während der Bildungszeit unserer Erdoberfläche, Stuttgart, 1858.
[312] "Strobiloid" because of its spiral development. The theory of the spiral growth of plants played an important part in botanical morphology about this time.
[313] Cf. Meckel's Principle of progressive Evolution, supra, p. 93.
[314] System der thierischen Morphologie, pp. 33, 457. Also C. Bruch, Die Wirbeltheorie des Schädels, am Skelette des Lachses geprüft, Frankfort-on-Main, 1862.
[315] In France the vertebral theory was advocated by Lavocat in his Nouvelle Ostéologie comparée de la tête des animaux domestiques, Toulouse, 1864. It seems also that Lacaze-Duthiers held fast to it even in 1872—Arch. zool. exp. gén., i., p. 51, 1872.
[316] An Essay on Classification, Boston, 1857, London, 1859. He considered the classificatory categories to be the categories of the Creator's thought, and hence natural, and in no sense mere conventions.
[317] "Principes d'Embryogénie, de Zoogénie et de Teratogénie," Mém. Acad. Sci., xxv., pp. 1-943, pls. xxv., 1860.
[318] "On the Morphology of the Cephalous Mollusca," Phil. Trans., 1853, Sci. Memoirs, i., pp. 152-92.
[319] "Observations sur les changements de forme que les divers Crustacés éprouvent," Ann. Sci. nat. (1) xxx., p. 360, 1833.