SCHULTZE, ON RHIZOPODA. 
221 
of the Polythalamia than those previously pointed out by him 
in his former work. 
The latter half of the tubular volution of the shell is not 
completely occupied by the animal substance, whilst the 
central portion is densely filled. In this situation, also, the 
oil- drops are accumulated to such an extent as materially to 
interfere with the transparency of the substance, in con- 
sequence of which it is necessary, in making a more par- 
ticular examination of the contents, to break up the shell and 
express the contents. Even under these circumstances, no 
nucleus could be perceived, such as may always be so readily 
demonstrated in Amceba, Difflugia, Gromia, &c., as is known 
to be present in many, if not most, others of the Protozoa. 
But of nuclei of this kind the author has hitherto never 
been able to perceive any trace, not only in the young 
Miliolidaej but also in other Polythalamia. 
From the circumstances under which the young Miliolidce 
made their appearance, it might be concluded that they must 
necessarily quit the parent in a tolerably perfect condition, 
and that it was probable they acquire the calcareous shell 
whilst still within the mother. 
Professor Schultze was next led to inquire further into the 
mode in which the young originated. When the calcareous 
shell of the parent animal was carefully broken up, it was 
found to contain only trifling remains of a fine granular 
organic substance, which, after patient and prolonged ob- 
servation, exhibited no trace of motion in delicate sarcode- 
filaments, such as is often, under other circumstances, pre- 
sented in separated particles of the animal substance. Nor 
could he perceive any vestige of a body which could be re- 
garded as a young one in process of development. The 
almost complete absence of any organic contents in the shell 
of an individual which 8 — 14 days previously was creeping 
about, renders it probable that the whole, or, at any rate, the 
main part of its body, had been transformed into young ones, 
a supposition which other observations had led the author to 
propound in his former work (p. 26), where he describes 
polythalamian shells in which most of the chambers were 
densely filled with dark- coloured globules, which might fairly 
be supposed to represent germ- granules. 
In his recent researches, however, recorded in the present 
paper, he appears to have met with only a single Polythalamian 
which was filled with similar globules. This belonged to the 
species formerly described by him under the name of Poly- 
morphina silicea, from the circumstance that its shell was 
siliceous, although itself possessing the form of a Nonionina. 
