370 PROF. EHRENBERG ON ANIMALS OF THE CHALK 
well as of distinct internal recipient nutritive organs, and of evident — 
organs of generation. | 
Fig. 1. Nonionina germanica, from the North Sea near Cuxhaven, — 
as representative of the organic relations in the family of the Rotalina 
of the Polythalamia, with its projecting locomotive organs, its body 
enclosed in the shell and contemporaneously filling all the chambers, 
without exsertile head and without tentacula, magnified 290 times. 
This form, although very similar externally to that on Plate V., is, as 
it seems, totally distinct from it in its entire formation and import. The 
first form was a composite animal or polypidom of from eighteen 
to twenty animalcules, which, closely connected laterally with each 
other by as many connecting parts of the chambers, formed apparently 
an inseparable regular whole, similar to a Nautilus. This second form 
is only a single animal, which represents a whole, quite similar to the 
conglomerated one, only simple. The former is a corallidom, this a — 
coral individual. This view is evidently proved by the simple con- — 
necting part of the chambers situated to the left. 
The structure and internal organization of this more simple form is 
far more easily seen than that of Geoponus. 
a. A living animalcule in the act of creeping, seen from the right 
side. The soft, transparent, large, very contractile pseudopodia, dif- 
ficult to be observed, are frequently longer than the diameter of the 
shell. The first chamber of the shell is colourless, but entirely filled 
with a crystalline, transparent, soft body-part ; all the chambers, be- 
ginning with the second, contain besides this a patch of granular 
mass of brownish-yellow colour. The whole surface of the shell is 
pierced with very minute pores, which form as many outlets of minute 
tubes of the shell. 
b. A similar animal, magnified 100 times, with numerous exserted 
pseudopodia. 
c. The same, seen from the left side, with numerous developed 
locomotive organs. 
d. An outline view of the same animal in front. 
e. A similar animal, after removal of the shell by weak hydro- 
chloric acid. The soft residue is the peculiar body which extends 
even to the first apparently empty cell. The parts performing the 
functions of nutritive canal now become evident from their being 
filled with siliceous-shielded Navicule. Nearly as far as the umbili- 
cus of the spiral there are apparent in the separate chambers swal- 
lowed Infusoria of the family Bacillarie ; and the simple connecting 
tube of the single chambers indicates the only way by which these; 
solid parts can have gradually advanced into the otherwise every- 
where closed interior. The intestinal canal therefore appears as an 
articulated wide tube, the joints of which are connected by narrow 
intermediate parts. 
In the interior of the joints near the wide nutritive organ, an 
outside of it, heginning with the second chamber, is situated a parce 
of granular yellow mass, which therefore cannot be received nutri 
ment, and consequently must be regarded as an ovarium provide 
with coloured eggs, especially considering the surprising increase 0 
these animalcules, and that the organs for these functions canno 
therefore be hidden. The entire surface of the soft body freed fro: 
