[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 Herouard, _Traite de Zoologie concrete_, Tome viii., Paris, 1898. [398] "Studien zur Urgeschichte des Wirbelthierkoerpers," _Mittheil. Zool. Stat. Neapel_, 1882-1907. [399] Leydig (_Vom Baue des thierischen Koerpers_, Tuebingen, 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_. [400] _Zeits. f. wiss. Zool._, xliv., 1886. [401] Quoted by E. B. Wilson, _Wood's Holl Biological Lectures for 1894_, p. 121. [402] _Cf._ Metschnikoff, _Quart. Journ. Microsc. Sci._, xxiv., pp. 89-111, 1884. [403] "Die Stammesverwandschaft der Wirbelthiere und Wirbellosen," _Arb. zool.-zoot. Instit. Wuerzburg_, ii., pp. 25-76, 1875; "Die Verwandschaftsbeziehungen der gegliederten Thiere," _Ibid._, iii., pp. 115-404, 1876-7. [404] Abuse of Cuvier also dates from the early days of evolution, see Radl, ii., pp. 12-17. [405] "On the origin and history of the urino-genital organs of Vertebrates," _Journ. Anat. Phys._, x., 1876. The conclusions of Balfour and Semper were adversely criticised by M. Fuerbringer (_Morph. Jahrb._, iv., 1878), and were negatived by later research. [406] _A Monograph on the Development of Elasmobranch Fishes_, London, 1878. [407] _A Treatise on Comparative Embryology_, vol. ii., p. 311, London, 1881. [408] _Loc. cit._, vol. ii., p. 327. [409] "On the Ancestral Form of the Chordata," _Q.J.M.S._, xxiii., 1883. "The Relation of the Nemertea to the Vertebrata," _ibid._, xxvii., 1887. Hubrecht gives the credit for the first indication of the relationship of Nemertines and Vertebrates to Harting (_Leerboek van de Grondbeginselen der Dierkunde_, 1874). [410] "Monographie der Capitelliden des Golfes von Neapel," _Fauna u. Flora des Golfes von Neapel_, Monog. xvi., Berlin, 1887. [411] _Mitt. Zool. Stat. Neapel_, vii., 1887. [412] _Nature_, xxxvi., p. 162, 1887. [413] "Nebendarm und Chorda dorsalis," _Nachr. Ges. Wiss. Goettingen_, p. 390, 1885. [414] "Embryologische Studien an Wuermern u. Arthropoden," _Mem. Acad. Sci. St Petersbourg_ (Petrograd), (7), xvi., 1870. And in _Arch. f. mikr. Anat._, vii., p. 122, 1871. [415] "The Old Mouth and the New," _Anat. Anz._, iii., 1888. _Nature_, xxxix., 1889. [416] "Recherches sur la Morphologie des Tuniciers," _Arch. de Biol._, vi., 1887. [417] "Die Stellung u. Bedeutung der Morphologie," _Morph. Jahrb._, i., pp. 1-19, 1876. [418] "Anatomie des Balanoglossus," _Mem. Acad. Sci. St Petersbourg_ (Petrograd), (7), x., 1866.