^Archer — On Freshicater Rhizopoda. 
89 
paper and of those made known by Greeff, does it not appear that 
Auerbach's conjecture in the foregoing extract is right: in other words, 
that if it should turn up once more it is highly probable that Amoeba 
hilimhosa will reveal itself as appertaining to Amphizonella (Greeff) ? 
A form of rhizopod, described as involved by a very flexible " mem- 
branous tegument," met with by Dujardin, to which he has given the 
generic name of Corycia, ^' seems, possibly, to come close to this genus. 
The account given by him, unaccompanied by any illustration, is, how- 
ever, too meagre to be certain as to what it actually is ; it does not 
seem, however, to be the same thing as Amoeba bilimbosa (Auerbach) ; 
it probably most resembles one of the forms referred to Amphizo- 
nella by Greeff — A. flava — but is most likely not specifically identical 
therewith ; a decision in respect to it must, I fear, remain in abeyance. 
I have sometimes thought that the unnamed rhizopod referred to 
by Fockef in a recent paper, simply under the designation of I^o. iii." 
(loc, cit.) might be closely related to my form, here named Amphizonella 
vestita. But the account given by that author of the form he had in 
view is far too brief and meagre to be able to arrive at an opinion. 
Could his figure possibly represent such a form as mine, no pseudo- 
podia present, and with very long and comparatively coarse, hair-like 
external processes ? or could his form possibly rather represent an 
Acanthocystis ? So uncertain does it, however, appear to me, as regards 
its true character, that I would here simply content myself with re- 
ferring to his communication, and leave the determination of his 
rhizopod and its possible relationship here, through such as that I now 
bring forward, to the future. 
Possibly, should any of the now four (perhaps I might write five 
or even six) forms referrible here be encountered by observers in this 
country, an attempt likewise to embody their seeming individual 
specialities, as well as those of the present new form, in short cha- 
racters, may not be quite without use (leaving, however, Amoeba 
hilimbosa (Auerb.) and Corycia (Duj.) in abeyance). I may begin with 
Greeff 's type-form — 
Amphizonella violacea (Greeff). J 
Large, mostly rotund in figure ; nucleus large, enclosed in a hyaline 
wall, filled ivith solid granules ; the granular body -mass permeated for 
the most pa/rt by a dark violet pigment, imparting that prevailing 
colour which, however, totvards the exterior, is varied somewhat by 
another diffuse yellowish or somewhat brownish pigment ; the pseudopodia 
colourless, conical, blunt ; the investing coat colourless, of varying depth 
or thickness, outwardly smooth. 
* Dujardin in " Annales des Sciences Naturelles, 1852," p. 241. 
t Dr. Gr. W. Focke: "Ueber schalenlose Eadiolarien des siissen "Wassers," in 
Siebold and KoUiker's " Zeitsclirift fiir Wissensch. Zoologie," Bd. xvii. p. 355, t. xxv., 
iii., a, b, c. 
+ Loc. aY.— Bd. ii., p. 323, t. xviii., fig. 12, 13, 14, 15. 
R. I. A. PROO.— VOL. I., SER. II., SCIENCE. N 
