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acid seems to have the effect of dislocating (some, at least, of) 
these as if they were, in a measure, articulated to the coat. 
While, then, much that is puzzling and enigmatical 
remains unsolved, enough is evidenced to show the imme- 
diate Amceban affinity of this form. But while it cannot 
appertain to any of the genera Ameeba, Difflugia, Arcella, 
or to any other distantly related types, as Pleurophrys, Pla- 
giophrys, &c., it is, perhaps, sufficiently fitly referable to an 
Ameeban genus lately established by Greeff—I mean Am- 
phizonella—to find a place legitimately there, at least 
temporarily, and until further research may possibly show 
its specialities to demand its removal, or show its nature 
and affinities to be distinct therefrom. 
Having, then, from what has preceded, gained a concep- 
tion of our rhizopod and its characteristics, as I have said, 
the next step is to assign it to its generic position—one 
which, as we have seen, is peculiar. However, the “ genus ” 
which it might typify, as I have mentioned, I think I find 
already instituted by Greeff in his Amphizonella,! and it will 
therefore be necessary that I should here endeavour to convey 
a conception of that genus, and of the three forms referred to 
it by Greeff, which, | may here mention, have all occurred 
not in water, but damp earth. This, indeed, may be the 
more advantageous, as no account of it exists in English 
works, nor have hitherto, so far as I am aware, any of the 
forms referable to it been recorded in this country, though 
I now myself have little doubt but that I have seen on one 
occasion his typical form, Amphizonella violacea, though, 
at the time, I paid far too little attention to it to note its 
specialities, or even as yet to venture definitely to announce 
its occurrence; but I have little doubt but that proper 
search must again disclose it. 
Greeff does not give, unfortunately, any diagnostic charac- 
ters of his genus, so that one has to construct in idea, gleaned 
from his general description, such a type as would include 
his forms (and mine), and exclude other “ Amebina.” And 
this type, briefly expressed, seems to be an Amceban body, 
plus a hyaline coat, penetrable.by the pseudopodia, its pre- 
vious condition recoverable, and strangely resistant to the 
action of some re-agents and at once succumbing to others, 
yet quite soft and yielding in its natural condition. 
But now to recapitulate Greeff’s account of his principal 
' Greeff: “ Ueber einige in der Erde lebende und andere Rhizopoden,” in 
Schultze’s ‘ Archiv fiir Mikroskopische Anatomie.’ Bd. ii, p. 323, T. xvii, 
figs. 12, 13, 14, 15, 18, 19. : 
