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D,- L. SOÓS 
spermatid considerably changed. The nucleus has become swollen and 
spherical, its chromatin diminished and is represented only by several 
granules scattered through a clear ground substance. From the distale 
centriole an extremely delicate thread has arisen which becomes later 
the extracellular part of the axial filament. This thread grows very 
quickly, chiefly toward the nucleus (PL XL, Fig. 2.), at it soon reaches 
the proximale centriole which lies, as mentioned above, in a hollow of 
the nucleus (Pl. XI., Fig. 3) ; this thread represents the intracellular 
part of the axial filament. This part grows much more quickly and soon 
becomes thicker than the extracellular part (PL XL, Fig. 3.), and remains 
thicker during the whole time of the development. The distale centriole 
transforms itself contemporaneously into a flat disc (PL XL, Fig. 3.). 
In the mean-time the nucleus also changes. Its chromatin accumu¬ 
lates beneath the nuclear membrane, but chiefly in the side turned 
toward the axial filament, the other part of the nucleus becomes occupied, 
however, by the nuclear sap. The beginning of the process is shown on 
Fig. 3., PL XL, a later stage is figured on Fig. 2., and the end stage 
is to be seen on Fig. 7. The chromatin in the stage shown on the last 
mentioned figure has condensed itself into a thick mass, the opposite 
pole is occupied, however by a clear body semilunar in shape. It is 
quite distinctly to be seen that the clear body is first a part of the 
nucleus, or it is within the nucleus (PL XL, Fig. 2.). The chromatin is 
in this stage not yet separated sharply from it, but they afterwards 
separate quite distinctly from each other (PL XL, Figs. 5., 6., 7.), at 
the end, however, they are separated by the nuclear membrane (Fig. 6.). 
The clear body does not always occupy the same part of the nucleus. 
It is to be found, as a rule, at the pole opposite to the axial filament, 
sometimes, however, on other parts of the nucleus (Fig. 6.). The most 
striking case is when it has the position shown on Fig. 4., PL XI. 
It is then a semicylindric, or cylindric, prolonged swelling, and it runs 
beneath the nuclear membrane from one side of the nucleus to the 
other. The clear semilunar bodies shown on Fig. 4., PL XL, are the 
projections of this body. This formation was first seen by Zimmermann (131), 
and he compared it very aptly to the rings of Saturne. Bolles Lee (12) 
named the nuclei having such a construction «noyau en Saturne» ; they 
constantly appear, according to him, during the development of the 
spermatozoa of H. pomatia, and they characterize the second period of 
the development. He named the clear body liyaloplast. 
The hyaloplast of Bolles Lee is a clear, refringent, homogeneous 
body which is scarcely or not at all stainable. It is said to occur both 
in the restmg and dividing spermatocytes of H. pomatia, and supposed 
