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CLIFFORD DOBELL. 
at their somewhat thicker proximal ends. Here it can be 
seen that each is provided with a very slender axial rod or 
fibre, which passes into the centre of the animal. Although 
sometimes visible, with difficulty, in the living organism, the 
pseudopodial axes are much more easily distinguishable in 
fixed and stained 1 specimens (see PI. 27, fig. 2), in which they 
appear as almost immeasurably fine radiating lines. In short, 
the pseudopodia appear to be, on a very small scale, axopodia 
such as are characteristic of most Heliozoa. 
The axes of the pseudopodia can be traced (PI. 27, figs. 1, 
2) through a clear area in the centre of the animal to a 
minute corpuscle — a so-called “ central granule ” — in which 
they are rooted. This little body is not always easily seen in 
living specimens, on account of its very small size, and on 
account of the many food-bodies present in the surrounding 
protoplasm. But in stained preparations it is always visible 
(cf . PI. 27, fig. 2), and presents various appearances which 
will be described below. The arrangement of the pseudo- 
podia and “ central granule ” is similar to that already 
described in Acanthocy stis, Wagnerella, and other 
Heliozoa. 
Many of the pseudopodia of a liviug specimen are ex- 
tremely long, attaining a length equal to three or four times 
the diameter of the animal's body (cf. PI. 27, fig. 1). In 
fixed and stained specimens, however, they are usually much 
contracted, and consequently appear shorter and fewer (PI. 27, 
fig. 2). During life they are studded irregularly with nume- 
rous minute granules (PI. 27, fig. 1), which constantly stream 
up and down them. These streaming granules are already 
well known in other Heliozoa. 
With the exception of the clear area surrounding the 
1 I fixed and stained the organisms in various ways. The best fixa- 
tion was obtained with Bouin’s fluid and Schaudinn’s sublimate-alcohol ; 
and by far the best of the stains which I tried was my alcoholic iron- 
alum hsematein, which I have described elsewhere (Dobell, 1914). All 
the figures here reproduced were stained by this method, which for 
delicacy and detail can hardly be surpassed. 
