DAVIS: SPERMATOGENESIS. Ot 
tends out free into the nucleus (Fig. 132). In this and succeeding 
stages there is almost invariably a plasmosome in close proximity to 
the monosome, usually in immediate contact with it, though in excep- 
tional cases at some distance from it. 
During stage /the bipartite structure of the monosome is very marked 
(Plate 3, Fig. 52; Plate 7, Figs. 133-138). One part, as in the pre- 
ceding stage, can be distinguished by its more compact structure and 
smooth contours; the other or elongated part is distinctly granular 
with rough, ragged contours. As shown in the figures, it is usually 
curved, and sometimes the two ends may come together so as to form 
a ring (Fig. 133). In some cases this ring may entirely surround the 
non-granular part, while the two parts are more or less intimately 
connected. 
The changes in the cytoplasm during the growth period are much 
the same as those described in Dissosteira. 
G. Steiroxys trilineata. 
1. Autosomes. 
In this locustid the spermatocytes pass through essentially the 
same stages as in the Acrididae, but owing to the small size of the cells 
and relatively great amount of chromatin the material is much less 
favorable for study. Figure 54 (Plate 3) shows the first stage (a) 
of the primary spermatocyte, while Figure 53 is an imperfectly fixed 
spermatocyte in the same stage. Owing to the chromatin being 
shrunken away from the nuclear wall the concavity on one side of 
the nucleus shows much better than on well fixed material. Figure 
55 is that of a somewhat later stage (c), in which, as in the Acrididae, 
fine chromatin granules are distributed along a much convoluted 
spireme. In this species, however, the chromatin is in much finer 
granules and more irregularly distributed along the thread than in any 
of the Acrididae. In the next stage (d) the spireme has the usual 
polar arrangement (Fig. 56) and at a little later stage (e) shows (Plate 
5, Fig. 69) a more or less distinct longitudinal splitting. This splitting 
is never as marked as in many of the Acrididae, but I believe there can 
be no doubt that such a stage occurs. I have failed to find any evi- 
dence of the side-to-side union of the spireme threads which Otte 
(:06) has found in Locusta. During stage /f all traces of the longi- 
tudinal splitting disappear owing to the fact that the chromatin 
granules become broken up into finer particles and are irregularly 
