individually occupy any definite direction, but are found 
tossed about, as it were, reminding one of a loosely tumbled- 
up heap of pins (without heads, how T ever, and pointed at 
each end). These never encroach into the substance of 
the inner globes. Emanating from amongst these spicula, 
lastly, proceed in every direction very numerous, closely-set 
pseudopodia, which are exceedingly long and quite straight, 
of immeasurable tenuity, quite hyaline, and not seemingly 
carrying granules. The opacity of the outer stratum, with 
its abundantly crowded spicula, along with the great fine- 
ness of the pseudopodia, together prevent our making out 
whether the latter take their origin from the inner globes or 
from the outer stratum. I imagine, however, so far as I can 
see, as well as from analogy of a form hereafter to be drawn 
attention to, that they proceed from the contained inner 
globes directly through the outer stratum. 
I have said that the spicula do not assume any definite 
position, but this is hardly always correct, for shortly after a 
specimen of this form is placed upon a slide for examination, 
and after it begins, as it were, to recover the shock of the 
transference, certain of the external spicula do begin to 
assume a more vertical or radial position, especially subjacent 
to certain of the pseudopodia. Along these they become 
crow r ded and lie up against them, forming around each of 
such a somewhat conical aggregation. They thus form a 
kind of involucrum (so to speak) to the pseudopodium which 
they invest, of an elongate-triangular outline, from the apex 
of which projects the pseudopodium afar into the water. 
Not all the pseudopodia become so notably surrounded by 
these clusters of spicula, but only a number, distributed at 
somewhat even distances, present this appearance, whilst the 
majority start off from the outer periphery of the rhizopod, 
from amongst the general crowd of spicula, without becoming 
specially surrounded by a cluster of them. Such a descrip- 
tion would seem to attribute to the spicula an independent 
power of change of location and of mode of arrangement ; 
but although, in watching an example of this rhizopod as it 
expands and gradually assumes its characteristic appearance 
under the microscope, it would almost seem as if some out of 
the dense mass of spicula spontaneously underwent a certain 
amount of arrangement as described, this, however, must be 
of course attributed to the mobility of the sarcode matrix 
itself forming the outer stratum in which they are imbedded 
causing them passively to yield to its outward changes of 
figure. It must be this outer stratum of soft sarcode 
winch, by sending out long conical projections around certain 
