[280]

Vergl. Physiologie d. niederen Thiere, 1903, p. 441.

[281]

For further details see Zittel, Lehrbuch der Palaeontologie, and Felix Bernard, Eléments de Palaeontologie, 1894.

[282]

For further details see Sollas, "The Formation of Flints," in The Age of the Earth, 1905, p. 131.

[283]

Willey's Zool. Results, pt. ii. 1899, p. 127.

[284]

Murbach, Archiv f. Naturg. lx. Bd. i. 1894, p. 217.