1 08 Testaceous Bliizo^ods from the RCnli.STff' 
the structures. This question becomes the more readily admissible 
also from the circumstance that, so far as the careful observation of 
Schultze would tend to indicate, there does not appear to be a 
single important character, either as regards the chitinoid shell or the 
sarcode body within it, in which the marine Lagynis can be said to 
differ from certain varieties of the well-known fresh-water Eugly- 
phidsB. And it is hardly necessary to point out that, instead of 
there being any a joriori reason why the marine and fresh-water 
forms of Protozoa should not, during the lapse of vast geological 
periods, become capable of sustaining life under the opposite con- 
ditions inseparable from these two distinct habitats, examples are by 
no means wanting which go far to prove that the transition from a 
marine to a fresh-water habitat may actually take place within 
comparatively limited periods of time, and with results analogous to 
that which constitutes the distinguishing feature between the 
chitinoid shell of the Lagynis and the siliceous shell of Gadium. 
According to Schultze, the sarcode body of Lagynis rarely fills 
the cavity of the shell, the posterior portion of the latter being 
occupied by four tapering prolongations, which, together with the 
sarcode mass from which they proceed, is composed of granular 
sarcode more opaque than the rest, whilst a clear globular portion 
is seen to occupy the centre of the mass. The pseudopodia are of 
a distinct Actinophryan type : the entire sarcode substance being 
at times rolled up into a spherical mass, which retains the clear por- 
tion at its centre and occupies the posterior part of the shell. (See 
Figs. 2 and 3, which are taken from Schultze's work.) 
The second genus of new oceanic forms to which I am desirous 
of calling attention is even more scarce in the deposits than 
Cadium; and it has not been my good fortune to detect a single 
specimen in which the sarcode body was even partially visible. 
Although from the general appearance and characters of the sili- 
ceous shell it seems highly probable that they are closely related to 
Cadium, they exhibit one striking peculiarity which is sufficient 
to warrant their being provisionally placed in a separate genus. 
I allude to the possession of a process which, in one variety at least, 
appears capable of being detached from the main body of the shell, 
as if it were constituted of a distinct and separable portion. To 
this genus I have given the name of Protocysfis ; leaving the exact 
nature and affinities of the sarcode body both of this genus and of 
Cadium to be determined when an opportunity of examining their 
living tissues shall have been obtained. Meanwhile I can only 
express regret at its being out of my power to enter more fully in 
each case into the details of the animal structure. 
Class. Ehizopoda. 
Order 3. Proteina. 
Fam. 1. ActinoiDliryna,, 
