STILL FOUND IN A LIVING STATE. 343 
2-4 following ones, contain quite transparent parts only. In ge- 
neral, from the second cell of each little ammonite, all the hinder 
cells are filled with two differently-coloured larger organs. One of 
them is the generally greenish-gray very thick alimentary canal, 
which forms, like the whole body, a jointed chain, expanded in 
each joint, and connected by a narrow isthmus (probably the 
sipho) with the adjoining anterior and posterior ones. After 
dissolving the shell of the living animal by weak acid, various 
siliceous Infusoria swallowed as nutriment might be distinctly 
perceived in the alimentary canal of Nonionina germanica, even 
in the innermost divisions of the spirals. There is no polygastric 
structure of the alimentary canal, but it is a simple organ dis- 
tended in the compartments of the body, consequently itself 
articulated with a single anterior aperture. Hitherto all the 
animals rejected coloured food. I never observed siliceous In- 
_ fusoria in the intestines of Geoponus, but in these associated ani- 
mals the space is certainly closed for each individual, and conse- 
quently much more confined than in the single animals of 
Nonionina. After dissolving the shell with acid, where Dujar- 
din found only a body remaining behind in the Rotalia, I was 
enabled, by a very slow process, to discover in both also a com- 
pletely spiral, articulated, inner body, the single articulations of 
which were connected in Nonionina by one, in Geoponus by eigh- 
teen to twenty tubes (siphones), as connecting parts of as many 
individual animals, lying close to one another in each articulation. 
Powerful acids destroy the shell so violently, that the delicate 
body is torn into numerous minute flakes. One drop of strong 
hydrochloric acid mixed in a watch-glass full of water, is just 
of the proper strength to dissolve in a short time the shells from 
the bodies of the animals placed in it. 
Besides the alimentary canal, a yellowish-brown granular 
mass is perceptible in each articulation, up to the last of the 
spirals, the first excepted. In Geoponus it envelopes irregularly 
a great portion of the alimentary canal; in Nonionina it always 
forms a frequently globular reddish-yellow mass at the inner 
sides of the articulations nearest to the umbilical district. This 
part of the organization may probably be regarded, from its 
coarse granular consistency, as the ovarium. 
Very surprising, moreover, was the occurrence of three speci- 
mens of Nonionina which bore pretty large petiolated mem- 
branaceous sacs with torn apertures fastened on to the back of 
their shell. These sacs appeared to be emptied egg-cells, simi- 
