SPERMATOGENESIS OF EUSCHISTUS Gite 
more thorough analysis. In the present paper I am able to 
describe them in much greater detail, thanks to the use of stronger 
powers of magnification and especially to certain very successful 
iron haematoxylin preparations. 
In the spermatogonia no evidence was found of indubitable 
mitochondria. One sees there (figs. 1, 3) scattered granules in 
addition to the mitosome (mit) and the idiozome (7d), but these 
have the same optical appearance as the idiozome material and 
therefore are probably remains of a disintegrated idiozome of 
a previous generation: and on sections that show the mitochon- 
dria of the spermatocytes deeply stained, these granules of the 
spermatogonia always remain pale. Further, there are certainly 
no filamentous mitochondria (chondriokonts) in the spermato- 
gonia; from which we should conclude either (1) that there are 
no mitochondria at all in the spermatogonia, or else (2) that the 
mitochondria of these cells differ chemically and physically from 
those of the spermatocytes. 
In the earliest stages of the spermatocytes (fig. 5) are found 
merely similar pale granules. But shortly thereafter there arise 
delicate deeply staining threads in the vicinity of the idiozome 
(fig. 7). They do not undergo any marked increase up to the 
zygotene stage (figs. 7-30), and are often apposed to the idiozome 
but whether actually within it is hard to determine. Sometimes, 
however, deep staining granules do lie within the idiozome (fig. 
30). There is no evidence in these earlier nor in later stages that 
they are produced by emigrated chromatin particles, in the sense 
that chromatin particles leave the nucleus bodily, and at first they 
are generally separated from the nucleus. Further, they are 
separated from the chromatin plate of the nucleus by the idio- 
zome. Just before the idiozome begins to degenerate they 
increase in length and number (figs. 31-35). Their rapid growth 
coincides more or less with the development of the sphere in the 
cell body, and with the conjugation of the autosomes in the nucleus 
(figs. 86-55), and they gradually come to extend into all regions 
of the cell body. Some of them are then usually on and within 
the sphere, others in contact with the idiozome, the most of them 
