498 LITERATÜRVERZEICHNIS. 



G8. Schneider, K. C, 1904, Die Urgenitalzellen der Ctenophoren, in: Z. 

 wiss. Zool. Yol. 76. 



69. Schultze, M., 1852, Zoologische Skizzen, ibid. Yol. 4. 



70. Sedgwick, A., 1884, On the origin of metameric seginentation and 



some other niorphological questions, in : Quart. Journ. Microsc. Sc. 

 (2) Vol. 24. 



71. Shearer, C, 1911, On the development and structure of the Trocho- 



phore of H3'^droides uncinatus (Eupomatus), ibid. Vol. 56. 



72. Surface, F. M., 1908, The early development of a Polyclad, Plano- 



cera inquilina, in: Proc. Acad. N. Sc. Philadelphia, Vol. 59. 



73. Torrey, J. C, 1902, The early development of the mesoblast in Tha- 



lassema, in: Anat. Anz. Vol. 21. 



74. 1903, The early embryology of Thalassema, in: Ann. New York 



Acad. Sc. Vol. 14. 



75. Treadwell, A. L., 1901, The cytogeny of Podarkc obscura, in : Journ. 



Morphol. Yol. 17. 



76. Wierzejsky, A., 1905, Embrj^ologie von Physa fontinalis, in: Z. wiss. 



Zool. Vol. 83. 



77. YVilson, E. B., 1890, Embryology of the Earthworm, in: Journ. Mor- 



phol. Vol. 3. 



78. 1892, The cell lineage of Nereis, ibid. Yol. G. 



79. 1893, Amphioxus and the mosaic theory of development, ibid. Yol. 8. 



80. 1898, Considerations on cell-lineage and ancestral reminiscence, 



in: Ann. New York Acad. Sc. Vol. 11. 

 81. 1903, Experiments on cleavage and localization in the Nemertine 



egg, in: Arch. Entw. Mech. Vol. 16. 



82. Wistinghausen, C. von, 1891, Untersuchungen über die Entwick- 



lung von Nereis Dumerilii, in : Mitth. Zool. Stat. Neapel, Yol. 10. 



83. Wol te reek, R., 1904, Beitrage zur praktischen Analyse der Poly- 



gordius-Entwicklung u. s. w., in: Arch. Entw. Mech. Vol. 18. 



84. Zeleny, C, 1904, Experiments on the localization of developniental 



factors in the Nemertine egg. in: Journ. Exper. Zool., Vol. 1. 



