Note 397 — Chapter XV
Reading edition
For the later history of the Amphioxus-Ascidian theory the reader may be referred to A. Willey's well-known work, Amphioxus and the Ancestry of the Vertebrates, New York and London, 1894, and to Delage et Hérouard, Traité de Zoologie concrète, Tome viii., Paris, 1898.