Archek — On Fresh water Rhizopoda. 85 
length. These motions are more vigorous than those of the hody in 
general ; they usually come forth rapidly, but only when the creature 
has been permitted to remain for some time at rest and undisturbed, 
disappearing again just as quickly upon any jar. 
''If we revert to the outer capsule, we find it showing won- 
derful peculiarities — on the one hand, an extraordinary resistance 
to outer influences (as before detailed), and on the other hand, as 
it appears, a soft and gelatinous consistence, readily permitting the 
penetration of the pseudopodia, and, without doubt, after their re- 
traction, filling up the openings produced in the substance by fusion at 
those places." [Touching the latter point — that is the ready fusibility 
of the substance of the capsule — the author next communicates a pecu- 
liar observation, one at same time of further interest.] '' This was an 
extremely curious fusion, or firm hanging-together (seen, however, 
only on one occasion) of two individuals. The capsules only were 
here fused together by their margins, whilst the two body-masses re- 
mained free, and without any connexion. This latter was, however, 
brought about by a peculiar indirect way, by a commissure of clear 
yellow hyaline substance proceeding from one individual to the other, 
of which substance mention was made above as a pigment sometimes 
occurring in the contents. This commissure originated on both sides, 
with a broad basis, taking up almost the one half of the circumference 
of the inner body, giving the appearance as if it flowed out therefrom, 
and it formed at the place of union an isthmus (or bridge), passing 
through the hyaline capsule-substance. The question becomes [says 
the author], what significance is to be attributed to this remarkable 
object — whether it represents an individual just about to undergo self- 
fission, or an act of reproduction, described for other Ehizopoda under 
the name of conjugation or zygosis ? [Although meantime the author 
was not in a position to prove either the one or the other for want of 
further observations on the object, he gives his adhesion rather to the 
interpretation of the case he describes as one of zygosis, from his 
having observed the young forms of the animal, as previously men- 
tioned, which are distinguished by the want of the outer hyaline ' cap- 
sule.'] Trom these and other reasons (the above described nature of 
the nucleus), one might be justified in attributing to this form a sexual 
reproduction, or rather a development of a young brood in the interior 
of the mother-body, and not a propagation by fission." 
The foregoing recapitulation (expressed in the third person) presents 
the account given by Greeff of his type-form nearly in full. To make 
the data more complete, by which readers of the present communica- 
tion can the better realize the generic idea of Amphizonella, in which 
my own new form seems to fit, I add in the same manner, but slightly 
contracted, all he has to say of the next form, called — 
Amphizonella dlgitata (Greefl'). 
As a second representative of the same genus as the foregoing (i.e. 
A.violacea), the author points to the form named -4. digitata, presenting, 
