ARCHER—ON RHIZOPODA. Va 
kinds of food as ordinarily form the nutriment or prey of Rhizopoda 
could find an entrance into the test in their entirety. 
It must, I think, follow, from what has been stated, that this crea- 
ture naturally falls under Dujardin’s genus Gromia. — 
But there are further characteristics to be mentioned and resem- 
blances to be adverted to which may, perhaps, hereafter, in the opinion 
of some, be found to render its position in that genus as possibly not 
quite tenable. 
When I first endeavoured to make out the characteristics of this 
little Rhizopod, and, having regard to the appearance presented by the 
densely granular, bluish, internal body mass, I was inclined to look 
upon this as equivalent to the “ nucleus,’ occupying, indeed, it would 
be true, by far the greater proportion of the body. It looked as if this 
Was suspended in a sarcode mass of quite hyaline appearance, filling 
the interval between it and the test, and giving off the pseudopodia 
through the part of the test at which exists the opening for their 
emission. But no one could look long at examples of this creature 
without readily perceiving a small, orbicular, whitish body, itself con- 
taining a central well-marked, far more minute, darkish granule, im- 
mersed, often a little to one side, within the bluish granular body 
portion. In fact, this ttle body, with its central dark granule, can, I 
imagine, hardly be otherwise regarded than as a true nucleus with a 
nucleolus. It could be found in nearly every specimen, if focussed 
accurately, with great readiness; where not seen, it can only be sup- 
posed that it was turned away from observation. But, further, the 
bluish granular body of the Rhizopod was itself capable of becoming 
self-divided transversely ; and in every instance in which this was seen 
there was a new white body with its black central dot—that is a new 
‘‘nucleus” with its ‘‘nucleolus” (to assume them as such)—in each 
half, and these generally near the recently divided surfaces of the Rhi- 
zopod body, so as to lie close to one another. In such cases of self- 
fission the upper half gave off its pseudopodia in the usual manner (fig. 
11). I never could, however, see any further progress or development 
of these so divided examples. 
There is much in the aspect of this Rhizopod, both in its test, kind 
of pseudopodia, whitish nucleus and its nucleolus, and in the self- 
division of the contained body mass, to call to mind the form I brought 
forward in a previous part of this paper (anté, p. 239) under a new 
generic and specific name, and called Cystophrys Haeckeliana. If, 
indeed, we imagine a very numerous group of individuals of the form 
now brought forward to be in immediate juxtaposition, and all to pour 
forth a large quantity of colourless sarcode from the oral aperture (if I 
may so use the word), and the cluster or group to become enveloped in 
the common sarcode mass—the whole group of individuals to become, 
in fact, mutually swallowed up therein—and then the marginal region 
to give off some comparatively short but pretty similar pseudopodia— 
if, indeed, we imagine all this, we should have something very like my 
Cystophrys Haeckeliana. But in the latter form the central cells show 
