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11. KoRSCHELT, EuGEN. — " Uber Bau und Eiitwicklung des Diiiophilus 



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12. Lang, A. — "Der Bau von Grunda segmentata und die Nerwandl- 



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13. Lang, A. — " Die Polycladen (Seeplanarien) des Golfes von Neapel und 



der angreuzenden Meereabsclinitte," 'Eauna Flora. Golf. Neapel,' 

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14. Lang, A. — " Beitrage zu eiuer Trophocoltlieorie Jenaischen," ' Zeit. f. 



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15. Lankester, E.Kay. — 'A Treatise on Zoology,' part ii, cliap. 2, "The 



Enterocoela and the Ccelomocoela," 1900, p. 1. 



16. Meyer, E. — " Studien iiber den Korperbau der Anneliden," 'Milt. a. d. 



Zool. Stat, zu Neapel,' vol. vii, 1886-7 (pi. xxvii, figs. 9 and 10). 



17. Moore, Anne. — "Dinophilus gardineri (sp. nov.)," 'Biological 



Bulletin,' No. 1, p. 15, 1899. 



18. Montgomery, T. H. — " On the Modes of Development of the Mesoderm 



and Mesenchyme with reference to the supposed Homologues of the 

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19. Nelson, J. A. — "The Early Development of Dinophilus: a Study in 



Cell-linage," 'Proc. Acad. Nat. Sci. Philad.,' p. 687, 190i. 



20. PiERANTONi, Umberto. — " SuUo SviUuppo del Protodrilus e del 



Saccocirrus," 'Mitt. a. d. Zool. Station Neapel,' vol. xvii, p. 575, 

 1906. 



21. Kepiachoff, W. — " On the Anatomy and History of the Development 



of Dinophilus gyrociliatus," O. Schmidt, Odessa, 1886. (Tiie 

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22. Schmidt, Oscar. — ' Neue Beitrage zur Naturgeschichte der Wurmer,' 



Jena, 1848. 



23. SciiiMKEWiTSCH, W. — " Zuv Kenntnis des Bancs und der Entwicklung 



des Dinophilus vom Weissen Mere," 'Zeit. Wiss. Zool.,' vol. xlix, 

 p. 46, 1895. 



24. Weldon, W. F. B. — "On Dinophilus gig as," 'Quart. Journ. Micr. 



Sci.,' 1886, p. 109. 



25. WiLHELMi, J. — "Untersuchungen iiber die Excretiousorgane der Suss- 



wassertricladen," ' Zeit. Wiss. Zool.,' vol. Ixxxi, p. 544, 1906. 



26. Vejdovsky, F. — "Zur Hamocoltheorie," 'Zeit. f. Wisseu. Zool.,' vol. 



Ixxxii, p. SO, 1905. 



27. Zeppelin, Max Graf. — " Uber den Bau u. die Theilungsvorgauge des 



Ctenodrilus monastylos, Nov. Spec," ' Inaugural Dissertation,' 

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