John P. ]\[iinson 345 



Fig. 67. Section showing germinal vesicle with distinct nuclear reticulum, 

 composed of spherical chromosomes of various sizes, and also numerous peri- 

 pheral nucleoli; a cytocenter with a clear center and two archoplasmic zones; 

 in the cytoplasm, also, numerous small yolk-nuclei arranged principally in 

 the cytoccel. 



Fig. 68. Section showing germinal vesicle with chromatin network; cyto- 

 center with astral rays; an elongated yolk-nucleus connected with the peri- 

 phery and a smaller one at opposite pole similarly connected. 



Fig. 69. Section showing germinal vesicle; a cytocenter with central 

 body surrounded by a denser zone, and an outer reticular zone. In the 

 cytocoel, are numerous small yolk-nuclei and near the germinal vesicle a 

 large irregular body staining like the smaller ones and apparently contin- 

 uous with the germinal vesicle. 



Fig. 70. Section of egg showing a reticulated irregular cytocenter; a dis- 

 tinct germinal vesicle in the neighborhood of which there is a conspic- 

 ous irregular yolk-nucleus apparently continuous with the granular matrix 

 of the germinal vesicle. 



Fig. 71. Section showing germinal vesicle with distinct nuclear retic- 

 ulum, and peripheral nucleoli; a reticulated cytocenter with central con- 

 densation; a large round yolk-nucleus and several very irregular ones 

 forming a more or less continuous mass in the cytocoel; several smaller 

 yolk-nuclei in the neighborhood of the germinal vesicle. 



PLATE V. 



Figs. 72-74. Three serial sections of an egg, showing sectioni5 of the 

 germinal vesicle, plasma channel, yolk-nuclei and cytocenter; a few true yolk 

 spheres near the periphery close to the subcuticular layer. 



Fig. 72. Section showing connection of the plasma channel with the 

 germinal vesicle; the cytoreticulum in the plasma channel very distinct, 

 and an irregular yolk-nucleus apparently connected with it; two other large 

 yolk-nuclei and many small ones in the cytocoel, and true yolk-bodies at peri- 

 phery. 



Fig. 73. Section of same egg as 72, showing further the connection of the 

 plasma channel with the germinal vesicle on the one hand and the yolk- 

 nucleus on the other hand; several yolk-nuclei in the cytoplasm; a distinct 

 cytocenter with evident astral radiations, showing the contrast between a 

 true cytocenter and the yolk-nucleus; the first yolk spheres as in the pre- 

 ceding section. 



Fig. 74. A section of the same egg as Fig. 72 and 73, showing yolk- 

 channel; and the various forms of yolk-nuclei and their distribution. 



Fig. 75. Section of an egg showing germinal vesicle; yolk-nuclei and their 

 relation to the germinal vesicle and the cytocoel; a large oval yolk-nucleus; 

 a reticulated cytocenter. 



Fig. 76. Section of egg showing numerous small yolk-nuclei and their 

 apparent connection with the germinal vesicle; numerous true yolk-spheres 

 near the subcuticular zone. 



Fig. 77. Section of egg showing nucleoli distributed apparently throughout 

 the germinal vesicle, but really due to the fact that the section has passed 

 near one pole of the germinal vesicle which on that account is smaller than 



