Aticher — On Freshivater Rhizopoda. 
77 
the example with a reagent, and perhaps nothing particular as yet 
discloses itself, when, I might say, all of a sndden, there appears to 
grow off, as it were, from the periphery, an, at first, homogeneous, pel- 
lucid, rather sharply-bounded, nearly colourless, or, very faintly bluish, 
Barcode border, either nearly simultaneously all round, or at one part 
only first ; or it may be that this never, during protracted observa- 
tion at least, presents itself universally. The first time I noticed this 
seemingly sudden growth of this very subtle, or, as I might almost say, 
of this etherial-looking covering, it was certainly with some surprise. 
One watches, and this delicate halo grows here and there broader, again 
narrowing here and there, keeping up this play for a length of time ; 
and so the border, hardly ever at anyone time of equal depth for any long 
stretch, thus presented more or less of a broadly-lobed outline. The 
broader and more pronounced this envelope gets as one watches, the 
more readily is seen in its very attenuated-looking substance, when 
focussed equatorially, a number of radial lines, beginning at the surface 
of the outer coat, and reaching to its own outer contour. These lines 
are not always like continuous striae, but of a dotted or somewhat 
shaJcy (so to say) appearance. A moment more, and probably they 
cannot be discerned ; and yet, in a brief interval, they seem at once 
and all roand to reappear. When these dotted lines are about most 
pronounced, so also, though always sharply marked off, is the edge or 
outline of the hyaline investment most pronounced, and the lines seem 
there to broaden, and form a bluish margin to the whole, this again 
soon becoming paler and disappearing. I have tried to realize the 
most pronounced appearance of this pretty condition in my Fig. 3. 
After a short while again, perhaps, this beautiful play ceases, and this 
hyaline investment disappears, nor leaves any more any appreciable 
evidence of its having been. 
I have said, there is sarcode abstinent and sarcode voracious — these 
idiosyncrasies as if bound up with certain forms, and maintained, so 
far as I can see, seemingly irrespective of the supplies around. Our 
rhizopod does not at all belong to the former category, but neither is it 
a hungry form. Crude food within its substance is not abundant, 
nor, as a matter of course, are the objects incepted large in dimensions, 
consisting seemingly only of minute protococcoids, and such like. In 
the first gathering in which I met this rhizopod, there occurred nume- 
rous examples of a curious little chroococcaceous alga (one endowed 
with a locomotive power, and one which, I may parenthetically ob- 
serve, well deserves in itself a closer investigation, to which I may 
hope for an opportunity, should I refind it, to return on a future occa- 
sion), and this organism seemed therein to form its principal food. 
Fig. 2 represents a vigorous specimen, which has more than once 
afforded us instructive details in connexion with its behaviour, and 
which contains a specimen of the alga referred to, which it had in- 
cepted. Fig. 3 shows a small protoeoccoid which has been incepted. 
Having, then, thus tried in idea to build up the structure, step by 
step, or to give such a descriptive picture, as it were touch upon touch, 
