EXPLANATION OF FIGUEES. 



ABBREVIATIONS. 



cp. Blood corpuscles. 



fil. Filaments of Fundulus. 



fil. vt. Filaments of vitellus. 



gran. Granulosa. 



m py. Micropyle. 



m py. cl. Micropylar cell. 



nl. gran. Nucleus of granulosa cell. 



nl. m py. Nucleus of micropylar cell. 



po. can. Pore-canals of the zona radiata. 



pr c. Rivet-shaped processes of zona. 



prj. i cl. Intercellular ridges. 



All the figures were made with the aid of the camera lucida, and all except 

 Figs. 1, 2, 5, 7, 11, and 12 from preparations mounted in benzole-balsam. Figs. 39- 

 41 were drawn by Dr. Mark, and the others by the author. 



