GERM CELLS IN THE ARTHROPODA 1651 
by a cellular envelope. Increase in size takes place 
synchronously in both the nucleus and the cytoplasm 
of the odcyte, and a number of stages in this process 
are illustrated in the accompanying figures. In 
Fig. 46, B a strand of cytoplasm is shown extending 
forward to the nurse chamber, and it is evidently by 
means of this pathway that nutritive material is 
conveyed to the odcyte. During the growth period 
the nurse cells decrease in size until they occupy but 
a very small space and the follicular epithelium 
becomes very much attenuated (compare Figs. 46, 4 
and 47, D). 
The fully developed odcytes (Fig. 47, D) are more 
or less vase-shaped with a broad base (posterior), 
a narrower “ waist-line,” and a slightly thicker distal 
(anterior) portion. They are not so long and slender 
as those illustrated by Silvestri, but perhaps this 
shape is attained later when the eggs are laid. 
Within the odcyte are two conspicuous bodies. At 
the anterior end is a very large nucleus (7) which 
almost completely fills that portion of the egg; it 
contains a few scattered rods of chromatin. Near 
the posterior end is a smaller but even more con- 
spicuous body (Fig. 47, D, k) which stains very deeply 
with iron-hematoxylin. This may be vacuolated 
and irregular, showing signs of disintegration, as 
shown in Fig. 47, or may possess a smooth outline and 
be entirely homogeneous. It is undoubtedly of a 
very tough nature, since it not infrequently tears out 
of the egg substance when struck by the sectioning 
knife. This obviously represents the “‘ nucleolo” of 
