Archer — On Fre^ihivater Rhizopoda. 
71 
I^OT does a certain amount of difficulty in identifying even some 
common forms with some of the older authors' descriptions or figures 
argue materially, if at all, against my view ; for I would as yet 
rather venture to think such difficulty may be attributable, not so 
much to the deviation of any particular form in question from the 
author^ s " species," which he may have had before him, as to the ori- 
ginal want of completeness in seizing the details, and want of con- 
formity of the author's '^description" or figure to IsTature's ''species,"— 
if I may rightly here use the term — due, perhaps, in great part to the 
fact that Nature is so chary in giving us more than glimpses of her 
doings, and all that the author saw was but a single aspect, or only a 
few of the features of a form of existence, the rest of which, it might 
be on that occasion, were screened and bidden from his ken. 
Hence I imagine that descriptions of these forms cannot be too 
minute or too much in detail. If such be as carefully and as closely as 
possible carried out, and figures made as painstakingly as possible, and 
examples afterwards found cannot be identified therewith, then that 
form must present various aspects or phases, and on the next occasion 
the variations should be noticed, or such examples maf represent a 
form essentially distinct. Eut if, on the other hand, at hundreds or 
thousands of miles distance, one and the same form turns up, present- 
ing when fully formed the same details, there cannot, I imagine, be a 
reasonable doubt but that such may legitimately be regarded as a 
permanent form or " species," if the term be allowed. 
"With an apology for obtruding these preliminary remarks, somewhat 
at variance with the views of observers, for whose opinions I have the 
most lively respect, I proceed to offer an account of my new form. 
AmpMzonella vestita (Sp. nov.) — Plate XII. Figs. 1-6. 
In endeavouring to bring before other more distant students of the 
Rhizopoda the somewhat variable aspects presented by the tout ensemble 
of the new form I name as above, I shall follow the precedent of my 
previous communication, giving first a running commentary on the de- 
tails presented by an examination of a number of examples, the charac- 
teristics of which I have made an effort to seize on, in the accompanying 
figures, and defer short diagnostic characters to the conclusion. 
As on former occasions, it may, perhaps, be most convenient 
to begin the description of this form, as it were, from within 
outward. 
We have, then, a minute sarcode body of what may be said to be 
normally of a globular figure, not exceeding say ^i^- of an inch 
in diameter, but sometimes examples presenting themselves not reach- 
ing more than two-thirds of that measurement. The basic substance 
of the body -mass might indeed be called by some colourless ; but, to 
my observation, it does not quite so appear, but sub-pellucid, and not 
quite uniform in tint, nor altogether homogeneous in consistence. The 
hue presented to my eyes is what I may call somewhat clouded, and 
