588 CRE88WELL SHEARER. 



39. Stossieh. M.— " Beitriiye ziir Entwicklungsgeseliielite cl. Cliajto- 



poden," • Sitzl). d. Acad. d. Wiss.,' vol. Ixxvii, 1878. 



40. Surface. F. M.— " The Early Development of a Polyclad, Plaiioceva 



inquilina," ' Proc. Acad. Nat. Sci. Pliil.,' 1907, p. 51-1. 



41. Torrey. J. C. — "The Early Development of Thalassema," 'Ann. 



N.Y. Acad. Sci.,' vol. xiv, 1903, p. 165. 



42. Treadwell, A. L. — " Equal and Unequal Cleavage in Annelid.s," 



• Biol. Lect. Woods HoU.,' 1899, p. 93. 



4G. ••The Cytogeny of Podarke oV)scura," 'Jonrn. Morph.,' 



vol. xvii, 1901, p. 399. 



44. Yejdovsky, F. — " Entwicklnngsgeschichtliche Untersncluingen," 



Prag, 1890-91. 



45. Whitman. C. O. — '•Embryology of Clepsine," 'Quart. Journ. 



Micr. Sci.,' vol. xviii, 1878, p. 215. 



46. Wierzejski, A. — "Embryology von Physa frontinali.s," ' Zeit. f. 



Wiss. Zool..' vol. Ixxxiii. 1905, p. 592. 



47. Wilson, E. B. — "The Germ-bands of Luml)ricus," 'Journ. 



Morph..' vol. i, 1887, p. 183. 



48. " The Origin of the MesoWast-Bands in Annelids." ' Journ. 



Morph.,' vol. iv, 1890, p. 205. 



49. "The Cell-Lineage of Nereis," •Journ. Morph.,' vol. vi, 



1892, p. 361. 



50. '• Cell-Lineage and Ancestral Reminiscence," • Ann. N.Y. 



Acad. Sci.,' vol. xi, 1898. p. 1. 



51. Woltereck, R. — •• Wurmkopf, Wurmrumpf, und Trochophora,'' 



• Zool. Anzg.,' vol. xxviii. 1901-. p. 273. 



52. •• Beitriige zur praktische Analyse der Polygordius, 



Entwicklung," • Arch. f. Entwickl.,' vol. xviii, 1904, p. 377. 



