BILATERALITY OF THE PIGEON S. EGG 



313 



SoMER DE, E. 1905 Les premiers stades de la vitellogenese dans I'ovule de la 

 poule. Ann. Soc. Med. de Gand., Tome 85, pp. 55-62. 



SoNNENBRODT, 1908 Die Wachstumsperiode der Oocyte des Huhns. Arch. f. 

 mikr. Anat., Bd. 72, p. 415. 



ToDARO, F. 1895 Beobachtungen und Betrachtungen liber die Furchung des 

 Eies und die Bildung der Keimblatter bei Seps chalcides. Untersuch. 

 z. Naturlehre. Bd. 15, p. 520. 



Van der Stricht, O. 1902 Le noyau vitellin de Balbiani et les pseudochromo- 

 somes chez les oiseau. Verb. d. Anat. Ges., 16 Vers., p. 168. 



Waldeyer, 1870 Eierstock und Ei. Leipzig. 



Whitman, C. O. 1878 The embryology of Clepsine. Quart. Jour. Micr. Sc, 

 vol. 18, pp. 215. 



1887 The kinetic phenomena of the egg during maturation and fecunda- 

 tion. Jour. Morph. vol., 1, p. 227. 



1893 The inadequacy of the cell theory of development. Biol. Lec- 

 tures, Wood's Hole. Boston, 1894. 



Will, L. 1893 Beitrage zur Entwicklungsgeschichte der Reptilien. (Gecko). 

 Zool. Jahrb., vol. 6, p. 1. 



Wilson, E. B. 1903 Experiments on cleavage and localization in the Nemertine 

 egg. Arch. f. Entwmech., vol. 16, p. 411. 



1904 Experimental studies on germinallocalization. Jour. Exp. Zool., 

 vol. 1, p. 1. 



Woods, F. A. 1902 The origin and migration of the germ cells in Acanthias. 

 Am. Jour. Anat., vol. 1, p. 307 



REFERENCE LETTERS 



a.o., anterior margin of outer periblast 



bid., blastodisc 



bz., boundary zone of central protoplasm 



cap., capillary 



cl., cloaca 



f.e., follicular epithelium 



g.v., germinal vesicle 



inf., infundibulum 



i.pbl., inner periblastic zone 



mg.dc, margin of segmental disc 



lat., latebra 



m.a., median artery 



vi.v., median vessel 



o.a., anterior margin of outer periblast 



o.p., posterior margin of outer peri- 

 blast 

 phi., periblast 

 pbl.r., periblastic ring 

 p.g., polar granules 

 p.r., polar ring 

 p.p., peripheral protoplasm 

 S.C., spherule crescent 

 s.d., segmental disc 

 St., stigma 

 S.Z., spherule zone 

 lU., 'uterus' 

 wdg., wedge 

 y.n., yolk nucleus 



