196 EMBRYOLOGY OF THE LOWEK VERTEBRATES m 



ventral wall of the canal : that it then underwent a gradual 

 shifting forwards along the ventral side : that as it did so the now 

 postanal portion with its splanchnoooele gradually atrophied the 

 position they occupied becoming filled mainly with muscle. 



LITERATURE 



Assheton. Quart. Journ. Micr. Soi., xxxviii, 1896. 



Assheton. The Work of J. S. Budgett. Cambridge, 1907. 



Balfour. Comparative Embryology, ii, 1881. 



Brachet. Journ. de l'Anat. et de la Physiologie, xxxii, 1896. 



Brauer. Zool. Jahrb. (Anat. ), xii, 1899. 



Brouha. Journ. de l'Anat. et de la Phys., xxxiv, 1898. 



Bryee. Journ. Anat. and Phys., xl, 1906. 



Budgett. Trans. Zool. Soo. Lond., xvi, 1901. 



Dean, Bashford. Zool. Jahrb. (Syst. ), ix, 1896. 



Druner. Zool. Jahrb. (Anat.), xv, 1901. 



Egert. Zool. Anzeiger, xlii, 1913. 



Goeppert. Morph. Jahrb., xvii, 1891. 



Goeppert. Morph. Jahrb., xx, 1893. 



Goette. Entwicklungsgeschichte der Unke. Leipzig, 1875. 



Goette. Zeitschr. wiss. Zool., lxix, 1901. 



Greil. Semons Forschungsreisen in .Australien, i. Jena, 1913. 



Hammar. Arch. f. Anat. u. Entwicklungsgesch., 1893. 



Hammar. Anat. Anzeiger, xiii, 1897. 



Juillet. Arch. zool. exper. [5], ix, 1912. 



Kallius. Anat. Hefte (Arb.), xvi, 1901. 



Kerr, Graham. Proc. Roy. Phys. Soc. Edin., xvi, 1906. 



Kerr, Graham. The Work of J. S. Budgett. Cambridge, 1907. 



Kerr, Graham. Quart. Journ. Micr. Sci., liv, 1910. 



Laguesse. Journ. de l'Anat. et de la Phys., xxx, 1894. 



Lankester, E. Eay. Quart. Journ. Micr. Sci., xvi, 1876. 



Marcus. Arch. f. mikr. Anat, lxxi, 1908. 



Moroff. Arch. f. mikr. Anat., Ix, 1902. 



Moser Arch. f. mikr. Anat., Ix, 1902. 



Moser. Arch. f. mikr. Anat., lxiii, 1904. 



Muller, W. Jenaische Zeitschrift, vi, 1871. 



Neumayr. Semons Forschungsreisen in Australien, i, 1904. 



Nicolas. Arch. Biol., xx, 1904. 



Phelps. Science, N.S. ix, 1899. 



Piper. Arch. f. Anat. und Entwicklungsgesoh., Suppl. Bd., 1902. 



Piper. Verh. Anat. Ges., Halle, 1902. 



Reighard and Phelps. Journ. Morph., xix, 1908. 



Rowntree. Trans. Linn. Soc. Lond., (2) ix. 1903. 



Sarasin, P. and F. Ergebnisse naturwiss. Forschungen auf Ceylon, ii, 3. 

 Wiesbaden, 1889. 



Sawadsky. Anat. Anzeiger, xl, 1911. 



Scammon. Amer. Journ. Anat., xiv, 1913. 



Sedgwick. Quart. Journ. Micr. Sci., xxxiii, 1892. 



Smith. Journ. Morph., xxiii, 1912. 



Taylor. Quart. Journ. Micr. Sci., lix, 1913. 



Voeltzkow. Abh. Senck. Ges., xxvi, 1899. 



Wenckebach. Ontwikkeling en de bouw der bursa Fabricii. Proefschrift. Leiden, 

 1888. 



Wijhe, van. Verhand. Konink. Akad. Wetensch. Amsterdam, Tweede Sectie, 

 Deel xviii, 1914. 



Wilson, Gregg. Proc. Roy. Phys. Soc. Edin., xiv, 1901. 



