ARCHER——ON RHIZOPODA. 269 
The observations of Greef on the form A. turfacea (Carter), = A. 
viridis (Greef), are, as I shall now briefly try to narrate: The body is 
of a globular figure, frequently densely filled with green granules, 
showing apparent vacuoles, not pulsating. From the circumference of 
this globular body there stand off in a radial manner the closely posed 
siliceous spicula, these of two lengths. The longer are hollow spines 
expanded at the base in a discoid manner, and minutely forked at the 
apex. These are said by Greef to be in length about two-thirds of the 
diameter of the body; I myself think they mostly attain in length as 
much at least as the full diameter of the body; and, indeed, Greef’s 
figures so depict them. Amongst these long radial spines there occur 
a fewer number of others, not attaining half their length (in Irish 
examples say about one-third), still more slender, also discoid at the 
base, but notably more widely furcate at the apex. The pseudopodia 
are long, delicate, colourless, and granuliferous, and by both Greef and 
Grenacher described as possessing an axis like those of Actinospherium. 
For so far all this is apparent on even a superficial examination, and it 
accords, too, with Grenacher’s description of his form, the main diffe- 
rence being that he represents the bifurcation of the apex of the longer 
spines as less pronounced and less divergent than in Carter’s, and they 
are said to reach in length only half of the diameter of the body; thus, 
indeed, more approaching in this regard Actynophrys viridis (Khr.), 
but still they are far fewer and far less crowded than in Ehrenberg’s 
figure. A new point brought forward by Grenacher is the existence 
in the centre of the globular sarcode mass of a little pale body or 
cavity, from which proceed in an everywhere radiant manner, from the 
very centre, numerous pale, delicate threads or lines, showing an agree- 
ment in appearance with the axes of the pseudopodia; and the author 
assumes, though he could not satisfy himself, that these lines radiating 
from the common centre were, in truth, carried on directly through 
and through the body mass, reappearing as the axes of the pseudopodia. 
Greef confirms the account given by Grenacher, as he was able to ex- 
trude by pressure a vesicle containing a solid “nuclear mass’ (Kern- 
masse), which he regards as the common central starting point, from 
which radiate the fine threads, and he thinks he can recognise in the 
extruded vesicle, with its contained corpuscle, the doubly bounded 
space which occupies the centre of an uninjured example, but which 
he could never see of that sharply bounded stellate figure depicted by 
Grenacher. He (Greef)) states he has been able to follow the central 
radiating lines even to under the surface of the body, where they get 
lost, and incapable of being directly followed outwards into the pseudo- 
podia. 
Greef alludes to two kinds of probable reproductive processes—a 
direct self-division of the total animal into two, and a resting or ‘‘ en- 
eysted” state. The latter consists in the withdrawal of the sarcode 
body-mass from the inner boundary formed by the union of the bases 
of the radial spines, leaving a rather wide empty border, and its becom- 
ing invested by a double coat, a firm inner one, when empty dotted, as 
