[390] "Entwickelungsgeschichte der einfachen Ascidien," Mém. Acad. Sci. St Pétersbourg (Petrograd), (vii.), x., No. 15, 1866, 19 pp., 3 pls. "Weitere Studien ü. die Entwicklung der einfachen Ascidien," Arch. f. mikr. Anat., vii., pp. 101-130, 1871.
[391] Descent of Man, i., p. 205, 1871.
[392] Arch. f. mikr. Anat., vi., 1870, and viii., 1872.
[393] Archives de Biologie, 1884, 1885, and 1887.
[384] Bull. Acad. Sci. St Pétersbourg (Petrograd) xiii., 1869, and Zeits. f. wiss. Zool., xxii., 1872.
[395] Mém. Acad. Sci. St Pétersbourg(Petrograd)(7), xix., 1873.
[396] Giard, Arch. zool. expér. gén., i., 1872, and Lacaze-Duthiers, ibid., iii., 1874.
[397] 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.
[398] "Studien zur Urgeschichte des Wirbelthierkörpers," Mittheil. Zool. Stat. Neapel, 1882-1907.
[399] Leydig (Vom Baue des thierischen Körpers, Tübingen, 1864), who, in a measure, forestalled Dohrn and Semper by comparing Vertebrates with reversed Arthropods, specially insects, supposed the old mouth to pass between the crura cerebri.