ARCHER—ON RHIZOPODA. Q47 
appearance than a little higher up, where it gradually assumes a more 
homogeneous condition until towards the upper third of its depth, 
where this sarcode investraent becomes more characterized by a ,sort of 
linear arrangement of the substance, the apparent lines assuming a 
nearly radial direction, until towards the periphery the substance be- 
comes, as it were, slit up into a very great number of fine linear acute 
prolongations, giving the margin a fimbriated or fringed appearance. 
These very slender external processes do not all project in a strictly 
radial manner, for they often lie more or less in a kind of tufted 
manner, thus giving the fringe-like margin a somewhat irregular ap- 
pearance. The pseudopodia emanating from the inner sarcode body 
pass directly through this outer stratum and project, some of them a 
distance more than twice the diameter of the body, into the water. 
The pseudopodia never seem either to branch or coalesce, nor ever 
fuse in any way with the substance of the investment surrounding the 
central sharply defined ball from which they originate. The chloro- 
phyll granules do not obtrude beyond the bounds of the latter, except 
very rarely and very few, and this possibly as the result of accident, 
perhaps a kind of mechanical displacement during an act of either 
inception or of ejection of food, although I have not seen any crude food in 
any of the specimens I met with. Of course, an undue pressure on the 
whole will squeeze it into an indistinguishable mass, the chlorophyll 
granules become scattered about, and the contour of the inner body 
quite obliterated ; and yet, if the pressure be but comparatively slight, 
the creature has the power gradually to recover its form and symmetry, 
and project its pseudopodia and expand its border almost as before. 
Those who inspect the figure of this form (or, indeed, of the others 
also) will, of course, understand that the drawing is made from a 
specimen focussed down to its equator, as it were, and that the con- 
tinuation of the investing portion intervenes between the inner globe 
and the observer, as well as at the margin (and, of course, behind) ; 
for, when focussed as the figures are drawn, the substance of the outer 
stratum is sufficiently transparent to offer no obstacle to the passage of 
the light, and we are enabled to see the body and its radiating pseudo- 
podia as if it were absent; when focussed up more and more, the 
cloudy outer substance comes into view, and we see by degrees the 
fimbriated periphery and the pseudopodia revealing themselves. 
The inner globe never shows any “‘ nucleus,” nor any inclosed or 
marginal pulsating vacuole, nor have I ever seen more than one inner 
globe in each specimen. This is a comparatively dead and inert form. 
This form thus agrees with Raphidiophrys in the inner globe, 
possessing a hollow globular stratum of chlorophyll granules, and in 
the outer stratum, of a different kind of sarcode, being endowed with a 
certain mobility. But this latter part of the organization possesses no 
spicula, a circumstance which, in the opinion of some, might be sufli- 
cient to place two such forms widely apart; but there are marine 
Radiolaria without spicula, or indeed any solid parts. The fimbriated 
margin, composed of the linear prolongations of the investing sarcode, 
is absent in Raphidiophrys viridis, and in that form this part of the 
