Note 192 — Chapter VIII · TRILOBITA
Reading edition
Studies in Evolution, 1901, pp. 197–225; Geol. Mag. 1902, p. 152. Walcott, Proc. Biol. Soc. Washington, ix., 1894, p. 89.
Reading edition
Studies in Evolution, 1901, pp. 197–225; Geol. Mag. 1902, p. 152. Walcott, Proc. Biol. Soc. Washington, ix., 1894, p. 89.