PLATE XIV. 



Fig. 20. — The vitelline body shows a distinct central vesicle, and a striated cap- 

 sule, the outermost layer touching the nuclear wall. The cytoplasm seems 

 to be drawn toward the body from all directions. The nucleolus is very char- 

 acteristic of the nucleus just now. The clear vesicle within is filled with very 

 dense bodies, which do not take the stain, but shine with a metallic luster. 



Fig. 21. — The cytoplasm throughout this egg is clear and uniformly reticular. 

 At a is the vitelline body. At 6 and c are structures identical with the cen- 

 tral vesicle of figure 18, plate XIII; h is especially clear, with a well-defined 

 wall and equally well-defined pseudo-chromosomes within. This multiplica- 

 tion of the structure which we have called the central vesicle seems to show 

 that it is not confined to the vitelline body, and, moreover, seems ample proof 

 that it is not the centrosome of the spider egg. 



Fig. 22.— The vitelline zone, a, is conspicuous in the early follicular eggs. It ex- 

 tends from the nurse-cells in the stalk almost to the periphery of the egg. 



Fig. 23. — A peculiar appearance of the oocyte, in which the yolk globules, a, have 

 begun to form about midway between the periphery and the center. 



Fig. 24. — An oocyte almost ready to leave the follicle. The stalk, a, is very small 

 and the nurse-cells few and reduced in size. A membrane, &, seems to be 

 forming between the nurse-cells and the egg contents. 



Fig. 25. — Two oocytes just previous to forming the follicle. There is at this time 

 no trace of a vitelline body. 



Fig. 26.— An oocyte in which the concentrically striated capsule of the vitelline 

 body is very distinct. At the center may be seen a sphere much smaller than 

 any yet found. There seems to be little uniformity in size of this formation , 

 which fact throws doubt upon its being a definite structure. 



Fig. '27.- Here again, as in figure 21, are two structures, besides the perfectly de- 

 veloped vitelline body, simulating the central vesicle. 



