982 Cc. H. MARTIN. 
free life, fix and develop into a stalked form, which, on 
account of its great resemblance to a form previously de- 
scribed by Robin, may be termed the Acinetopsis stage. 
This gives rise, by repeated budding, to a large number of 
peculiar small buds, each of which is provided with a single 
thick tentacle. he tentacled buds become free, and crawl) 
by means of their tentacle up the stalk of an Hphelota, which 
they infect. 
In material brought on the succeeding days the ravages of 
the disease became more and more apparent, until in material 
collected on May 9th there was nothing to be seen except a 
large number of bare stalks of Ephelota, a few encysted 
forms, and a large number of the empty thece of the 
parasite. 
In material brought on May 12th I found, after much 
search, a few encysted Hphelota and some young healthy 
budding forms; these rapidly increased in number until the 
collected weed was again covered with Ephelota. On May 
16th a second epidemic, which corresponded with the one 
described, recurred. I propose to call this parasite Tachy- 
blaston ephelotensis in order to emphasise the extra- 
ordinary rapidity with which it infects large numbers of 
Ephelota. 
(' HER INTERNAL STAGE OF THE PARASITE.— The infected 
Ephelota are readily distinguished even under a low power 
binocular microscope (1) by the absence of external buds, 
(2) by the presence of peculiar rounded bodies in their cyto- 
plasm. In a fairly early stage of infection, shown in text-fig. 
11, which was drawn from a living specimen, there was a 
single rounded body occupying the centre of the body of the 
Ephelota. The nucleus of the parasite could be clearly seen 
as light area lying in the cytoplasm. The cytoplasm in this, 
as in all the other stages of the parasite, is clearly marked off 
from the cytoplasm of its host, by the peculiar small refrin- 
gent granules which it contains (PI. VIII, fig. 5). 
At first I was inclined to attribute this appearance to the 
presence of fat, which is very common in Acinetaria, but as 
