39 
ever, these amoeba-like movements were not particularly 
rapid and soon ceased. They wore not to be compared 
with the rapid motions of the pretty stellar and arborescent 
figures which I had remarked with the orange-red balls in 
the white Spirula shell, and which I am just about to 
describe. 
Examined by a low magnifier and by direct light these 
forms had a very pretty appearance. The opaque, shining, 
white porcelain-like Spirula shell looked as if it was adorned 
with scattered, star-shaped reddish-yellow pigment cells, 
like those which are so common in the skin of the lower 
vertebrata (fishes, amphibia). Each star-like flake con- 
tained an irregular, roundish, central mass of about 0 2 to 
0 3 mm. in diameter, and a number (usually from five to ten) 
of large branches which radiated from the central mass, and 
moved very finely and prettily. On the application of a 
stronger power a change of form was observable both in the 
central mass and in the branches and their twigs, which 
was produced by the spontaneous contraction of the starlike 
body. One might have thought that he had chromatophores 
before his eyes on the surface of the Spirula. But no trace 
of a mantle remained on the completely naked, apparently 
long wave-tossed Spirula shell ; and I therefore recognised 
in the prettily-streaked body a large organism allied to the 
Ehizopoda. In order to examine it better by reflected light 
it was absolutely necessary to detach it from the opaque 
Spirula shell. Several attempts to detach it with a fine 
cataract needle, or to raise it with a thin splinter of the 
shell itself, failed totally. I brought under the microscope 
only small shapeless fragments of the reddish-yellow proto- 
plasma. I therefore laid two larger fragments of the shell 
which had each a reddish-yellow star adhering to them, in 
a shallow watch-glass with sea water which I covered w r ith 
another watch-glass, and put aside in a damp room. My 
intention of inducing the Rhizopod to creep down suc- 
ceeded with one specimen in a few hours ; with two others 
next day ; and I had now the pleasure of examining at my 
leisure this remarkable organism which had moved from the 
Spirula shell into the watch-glass, and had expanded itself 
here (fig. 11, 12). Each star-shaped body now showed 
more plainly, with the aid of a stronger magnifying power 
without a covering-glass, a beautiful plasma or sarcode net, as 
fully developed, and with as numerous meshes, as is found 
among the Polythalamia and Radiolaria, Myxomyceta and 
Lieberkuhni®. 
The central plasma mass formed a flat, transparent disc, of 
