1880.] in the common Fowl and in the Rabbit. 247 



of striae described by A. Schultz, in ovarian ova of the Torpedo. ("Zur Ent- 

 wickelungsgeschichte des Selachier-eies, " Arch. f. mikr. Anat.," XI, p. 577.) 



6. Waldeyer, " Eierstock undEi," p. 62, and fig. 25. 



7. Balfour, loc. cit. 



8. Oegenbaur (" Eier der Wirbelthiere mit partieller Dotterfurchung, Mutter's 



Archiv." 1861, p. 517) has described a similar homogeneous j layer in the 

 reptilian ovum. 



9. This is certainly the case in spite of Waldeyer's reiterated assertion to the contrary 



(loc. cit., p. 58 ; and article " Eierstock," in Strieker's " Handbuch der 

 Grewebelehre," p. 557). 



10. Balfour, loc. cit., p. 391. 



11. "Waldeyer, "Eierstock and Ei," pp. 40 and 47. 



12 E. F. W. Pfliiger, " Untersuchungen zur Anatomie und Physiologie der Eier- 

 stocke der Saugethiere." 4te. Mittheilung. " Med. Centralzeitung," 1862. 

 No. 90. 



13. Hj. Lindgren. " Ueber das Vorhandensein von wirklichen Poren-kanalehen 



in der zona pellucida des Saugethieres," &c. "Arch. f. Anat. u. Phys." Anato- 

 mische, Abtheilung, 1877, p. 360. 



14. Wagener (Bemerkungen ueber den Eierstock und den gelben Korper," " Arch. 



f. Anat. u. Phys." Anatomische, Abth. 1879, p. 181) describes and figures a 

 connexion of the cells of the discus proligerus with the substance of the 

 vitellus through the pores in the zona pellucida. 



15. Compare Balfour, loc. cit., p. 427. 



16. Kuppfer. " Die Stammverwandtschaft zwischen Ascidien u. Wirbelthieren," 



" Arch. f. mikr. Anat.," V, 459. 



17. N. Kleinenberg. Hydra. Leipzig, 1872. 



18. J. Foulis, " On the Development of the Ova and structure of the Ovary in Man 



and other Mammalia." " Transactions of the Boyal Society of Edinburgh," 

 1875, p. 362. 



19. Compare Waldeyer, loc. cit., pp. 30 et seq. 



20. " Untersuchungen," &c, 3te Mittheilung. " Med. Centralzeitung," 1862, No. 88 j 



and in his important monograph, " Ueber die Eierstocke der Saugethiere 

 und Menschen," 1862. 

 F. Valentin (" Ueber die Entwickelung der Follikel in dem Eierstocke der 

 Saugethiere," " Midler's Archiv.," 1838) described the glandular tubes in the 

 ovary, but failed to recognise their connexion with the ovarial epithelium — 

 the true nature of which was not indeed recognised until Waldeyer drew 

 especial attention to it. 



21. Ed. van Beneden. " Composition et signification de l'ceuf," 1868. 



DESCRIPTION OF THE FIGURES. 



Figs. 1 to 13 are from sections of hens' ovaries, portions of which were hardened 

 first in picric acid, and subsequently in alcohol. The sections were 

 made after imbedding by the method of soaking with cacao-butter 

 (" Course of Practical Histology," p. 92), and were stained either with 

 logwood or with magenta. 

 Fig. 1. Germinal vesicle, germinal spot, and intra- vesicular network of a small 

 ovarian ovum ( - 305 millim. in diameter). Magnified 250 diameters. 

 m.v. Membrane of germinal vesicle. 

 g. Break in the intra- vesicular network. 



s 2 



