[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. Göttingen, p. 390, 1885.

[414] "Embryologische Studien an Würmern u. Arthropoden," Mém. Acad. Sci. St Pétersbourg (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," Mém. Acad. Sci. St Pétersbourg (Petrograd), (7), x., 1866.

[419] Zeit. f. wiss. Zool., xx., 1870. For a recent view of the relation of the Enteropneusta to the Echinoderma, see J. F. Gemmill, Phil. Trans. B., ccv., pp. 213-94, 1914.