38 GERM-CELL CYCLE IN ANIMALS 
Fic. 7.— Leptinotarsa de- 
cemlineata. Diagram of 
an ovarian tubule showing 
various stages in the de- 
velopment of the odcyte. 
The capital letters refer to 
the positions f cellsshown 
in Fig. 8. cy = cytoplasm; 
es = egg string; n.c = nurse 
chamber; déoc = odcyte; y.o 
= young oocyte. 
and cytoplasmic structures 
are shown in Fig. 8. Two 
odcytes and a neighboring 
epithelial cell from position 
A in Fig. 7 are shown in Fig. 
8, A. 
The nuclei of the odcytes 
are large and contain a dis- 
tinct spireme; the cytoplasm 
is small in amount and ap- 
parently homogeneous. After 
a short period of growth the 
odcytes form a linear series 
in the ovarian tubule and 
become connected with the 
spaces between the nurse cells 
by means of egg strings (Fig. 
7, e.8) through which the nu- 
tritive streams flow into the 
odcytes. One of the young- 
est of these odcytes is repre- 
sented in Fig. 8, B (position 
B in Fig. 7). The nucleus is 
no larger than in those of the 
earlier stage; its chromatin 
forms a reticulum, and a dis- 
tinct nucleolus is present. 
The cytoplasm, on the other 
hand, has trebled in amount 
and within it are embedded 
a number of spherical bodies 
