18 PAULINE H. DEDERER 
The cells next to be described are taken from sections of ovaries 
fixed in January, later than the preceding sections. Figure 57, 
already referred to, shows a portion of an egg string Just beyond 
its point of emergence from the ovary proper. Figure 60 is a 
nucleus from a similar egg. The spireme is typical for the 
eggs at this period; it is still convoluted as before, with no trace 
of a longitudinal split. The plasmosome varies considerably 
in form, consisting usually of a dark spherical portion, and a 
light portion, sometimes lobed and vacuolated. In this figure 
the plasmosome gives the appearance of breaking through the 
nuclear membrane, and in another egg near by a similar body 
was observed lying in the reticular cytoplasm at a little distance 
from the nucleus. A few other cases were observed on the same 
slide. The material appeared to be unusually well fixed, but as 
other ovaries failed to show a similar condition, this is probably 
not a normal occurrence. 
It is convenient at this point to note more definitely the re- 
lation between the eggs and nurse cells during this period of 
growth. In figure 57 two nurse cells are seen connected with 
the egg, the flask-shaped region with its faint converging lines 
of protoplasm is confluent through the nurse tubes with a dark 
granular layer which surrounds the egg nucleus, broadening 
out into a conspicuous mass on the farther side of the nucleus. 
Here it sends long processes radiating out into the reticular 
portion of the cytoplasm. In most sections this finely granular 
region has a yellowish tinge, like the nucleus, markedly differ- 
ent from the reticular region of the cells. The mass frequently 
contains small vacuoles and deep-staining granules and is similar 
in appearance to the so-called yolk nuclei in various eggs; it 
seems probable that in P. cynthia the mass is of the same nature. 
Pauleke (00), Gross (03), and others, have described whole 
nurse cells entering the egg during the growth period. This 
would be impossible in the moth, on account of the small diameter 
of the nurse tubes. 
Stage g: Disappearance of the spireme in the later growth 
period. The next stages figured are sections from the ovary 
shown in figure 31, from a moth fixed a few days before the time 
