"^'iSi!^,i:t" ^MMm in the Uni.

514 PROTOZOA.
GEEEPF notices (I. c.) a probably sexual mode of generation in an Amoeba
from Poppelsdorf. The germs of the brood appear in the cavity of the
nucleus, close to which the author found, in the same individual, several
oval capsules containing hair-like bodies corresponding to those which we
find in the nucleoli of Infusoria. Greeff suggests that probably such a
sexual differentiation exists also in the Polythalamia and Radiolaria, reestablishing
the claim of the Rhizopoda to be considered as true animals and not
as "Protista."
Difflugia ligata, sp. nov., Tatem (M. Micr. J. Dec. 1870, p. 313); D. bipes,
sp. nov., Carter (Ann. N. H. May 1870, p. 323), Budleigh-Salterton. In
both of these new species the body is fixed by three sarcodal filaments to
the posterior part of the test.
AmphizoneUa vestita, sp. nov., Archer (Proc. R. Irish Ac. Dec. 12th, 1870),
counties Westmeath and Tipperary. As Greeff, who established the genus,
did not give any special diagnosis of it, the following is supplied by Mr.
Archer:—Genus AmphizoneUa, Greeff. Rhizopod with a nucleated bodymass,
enclosed in a distinct (and separable), more or less pellucid, elastic,
and yielding investment, through which it temporarily protrudes a greater
or less number of digitate or tapering short hyaline pseudopodia, upon the
retraction of which the extemporized openings in the investment become
effaced by virtue of its inherent fusibility.
ARCHER describes (Proc. R. Irish Ac. Dec. 12th, 1870) a form, in two
varieties, which he supposes may be identical with Playioph-ys sphcerica,
Clap. & Lachm. He points out, however, the presence of a distinct test,
of tree-like instead of AcUnophryan pseudopodia, as figured by Claparede
and Lachmann, and of a distinct internal " nucleus."
GRENACHER (I. c.) has observed in the centre of Actinophrys sol a little vesicular
body about one-fourth to one-fifth of the diameter of the entire organism,
which he considers equivalent to the " central capsule'' of the marine
Radiolaria ; indeed it would be quite the same structure were the microscope
to demonstrate an unquestionable membrane for it. The central axes of the
pseudopodia may be traced to the outer wall or surface of this vesicle. Regarding
the question of placing the Actinophryans among the Radiolaria, the
author refers to the similar relations of the pseudopodia to the extracapsular
sarcode, and to the resemblance of the spicular skeleton of Acanthocystis to
similar structures in Radiolaria. Even the want of a central capsule would
not absolutely shut them out from Radiolaria, as Cocciuosphara, Stuart, has
none; and the same is to be said as regards the absence of " yellow cells," as
these are wanting in the Acanthometridse. The contractile vacuole is the
only " veto " against the union of Actinophrys sol with the Radiolaria. Regarding
this contractile vacuole, Grenacher is not inclined to accept it as an
organ of special nature, but thinks rather that any vacuole at the surface
may become contractile. The author likewise asks if the " cells " of Actinophrys
(Actinospharium) eichhovni may not possibly be the homologuea of the
central capsule in A. sol. If so, then A. eichhorni is one of the Radiolaria
Polyzoa.
AncHEK likewise notices in a large green Actinophryan (species undetermined)
a clear spherical body occupying the centre of the body-mass,
which seems to be a veritable central capsule. He also witnessed the evolution
of minute biciliated greenish zoospores from the body of the Actino-