ON THE SPERMATOGENESIS OF THE SILK-WORM. 139 
individual chromosomes are still to be recognized (fig. 75 a, 76). 
An entire spermatozoon of this stage is represented in fig. 83. 
Here the “Nebenkern” is no more to be seen as a distinct 
body as before, but appears only as a thicker mass with a fine 
thread-like prolongation. The mitosome has also completely 
vanished from sight. 
Figs. 78, 79 and 80 show more advanced stages. The 
chromosomes which are accumulated at the periphery of the 
nucleus became now coagulated into a single compact mass and 
form a deeply stainable body with a pointed end and a vacuole 
in the centre of it. 
In fig. 82 is shown a spermatocyste with nearly matured 
spermatozoa contained in it. In the head part of the cyste, is 
seen a large cell metamorphosed from a nucleus of the cyste and 
functioning as a supporting cell.d) The form of this cell is very 
similar to the large supporting cell in the blind end of the 
testicular follicle and may be compared with the cells des¬ 
cribed and figured by Flemming in a spermatocyste of Sala- 
mandra maculosa (9). 
On the “ Hodenzwischenkörperchen.” 
The “ Hodenzwischenkörperchen ” of van Beneden are also 
to be found in the genital follicles of the silk-worm of both 
sexes. In preparations fixed by Flemming’s strong solution 
and stained by Hermann’s triple staining very conspicuous cells 
are to be seen here and there (figs. 7 h , 84). They are round 
with homogeneous protoplasm, in the centre or at the peripher} 7 
of which a deep stainable chromatin body, sometimes with va¬ 
cuoles in it, is to be seen. Beside this, sometimes one or 
more small deeply stainable spots occur in the cytoplasm. In 
the early part of the formative stage, these cells are found 
in the midst of the primary germ-cells, while in later stages 
the entire mass of cells in a cyste presents such a structure 
except those at the wall of the cyste (fig. 84). They are also 
to be seen in the growing stage, where their structure is similar 
to those of the formative stage. 
Sometimes the granular stainable spots in the cytoplasm 
(1) This is already described by Tichomiroff (37). 
