Nont)) HiDGULT OF THE TERRESTRIAL [SOPODS. IOI 
periphery, a relatively clear zone with but little of the other 
constituents being found immediately within the nuclear mem- 
brane (see Fig. 4). 
Secondly, there is the chromatin, which in the less-deformed 
nuclei is in the form of innumerable spherical granules (Fig. 
10), more densely aggregated towards the centre of the nucleus 
(Fig. 2), but occurring also in less numbers in the clear 
zone just within the membrane. The size of the granules 
seems to vary somewhat in different specimens, so that the 
nuclei present in some cases a relatively coarsely granular 
appearance. Carnoy ('84) and van Bambeke ('87) maintain the 
opinion that the chromatin is arranged in a skein in these 
nuclei; I have seen nothing which would lead me to support 
this view, the granules being perfectly separate from one 
another and scattered irregularly through the nucleus. In the 
most highly deformed nuclei a greater or less portion of the 
chromatin loses its granular arrangement, the granules being 
apparently drawn out so as to assume the form of fibrils, and 
sometimes fusion of the various fibrils seems to occur, so that 
portions of the nucleus appear practically homogeneous. Van 
Bambeke (87) has noted these peculiarities and concludes that 
the chromatin in the living cells has a viscous consistency, a 
view which there seems no reason to doubt. 
Thirdly, the chromatin granules are supported upon an 
achromatic substance (Fig. 10), which is not easily demonstrable 
owing to the number and dense arrangement of the granules. 
It seems, however, to possess a reticular arrangement. 
Finally, nucleoli (Figs. 2, 10, z/) are to be found in all cells, 
varying from a size almost equal to that of the chromatin gran- 
ules to several times that size, and apparently varying also in 
number from two to several. In /dotea robusta the nucleoli 
seem to be of an almost constant size, and never exceed two in 
number. 
At first sight the nuclei remind one of the figures, given by 
Korschelt (96), of the branched nuclei of the silk glands of the 
Lepidoptera; and one might suppose that what I have termed 
the chromatin granules were really what Korschelt has termed 
microsomes, and that the nucleoli were the real chromatin 
