65 
the pigmented epithelium over them is distinctly dis- 
cernible) in the dermal lymph-spaces, held in place by 
the surrounding tissue, but not embedded in it, and they 
can easily be removed with only a few lymphocytes, &c., 
attached. They are quite absent from the somatic mus- 
eulature. On opening the body-cavity, numerous parasites 
are seen in the gut-mesentery, usually close to, but not 
actually in the wall of, the blood-vessels. Fig. 2 elves 
an idea of their appearance in the mesentery of one loop 
of the intestine, from which it will be seen that, when 
internal, the cysts are uniformly shghtly smaller than 
when beneath the skin. ‘They are generally oval or 
elliptical, and never exceed 1 mm. in diameter. 
Unfortunately, I have, so far, not found any younger, or 
different, stages, but it is most likely that the parasites, 
when smaller, pass into a blood-capillary or lymph- 
channel from the gut, and there grow and encyst (?), 
since in section (fig. 5) they are surrounded by a space 
(spa.). All the internal organs are quite free and normal, 
and for this reason I should not say the hosts are harmed 
to any dangerous extent. The two or three afflicted speci- 
mens which I have so far seen certainly cannot be 
. 
described as ** emaciated.” 
Minute structure. Notwithstanding the size the 
things grow to (up to 1} mm. in diameter) each is, 
undoubtedly, a single cell; as to that I have not the 
least doubt. There is no trace of cell-division, nor of 
cell-nuclei in the ordinary sense, in it; whatever a cyst 
represents, it is, as a whole, unicellular. Fig. 3 is a sec- 
tion, sightly magnified, through one in the mesentery, the 
space around representing an enlarged capillary or a lymph- 
channel, as already mentioned. This happened to be 
more spherical than the internal ones usually are; it is 
surrounded by a layer of amoebocytes, Kc. (lym), rather 
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