32 
Protozoa in Trichoptera 
I cannot define the position that this new genus should occupy. On 
reading Alexeieff’s brief, unillustrated description of Macrostoma 
caulleryi from the tadpole of the frog (Compt. Rend. Soc. Biol. (1909), 
LXVI. p. 199), I was inclined to think that my parasite might be related 
thereto, even though Macrostoma was described as having three flagella 
and a “vesicular” nucleus. Lately, Wenyon has published a paper 
{Parasitology (1910), iii. 2, p. 210) on another species of Macrostoma — 
M. mesnili —from human faeces. From this account with its figures, it 
is abundantly clear to me that Embadomonas has very little in common 
with Macrostoma, beyond the possession of a large cytostome. 
The new genus may be defined thus : Slipper-shaped mono-flagellate, 
with pointed posterior end and blunt, rounded, anterior end, which is bent 
back at an angle tvith the long axis of the body. A large cytostome 
occupies almost all the anterior half of the body. The slender flagellum 
arises from a basal granide on the anterior margin of the cytostome. 
The nucleus is a diffuse mass containing several ch romatin clumps: it lies 
in the extreme anterior end, in front of the cytostome. 
(b) Crithidia campanulata, Leger. 
In five of the two hundred larvae examined, the hind-gut contained 
the adult and encysting stages of a flagellate, which agrees, in all 
essentials, with Crithidia campanidata, Leger. For reasons given above, 
I do not intend to create a new species, although both previous records 
of the parasite were drawn from dipterous larvae. 
The flagellate was always found in the upper regions of the hind-gut 
along with the Trichomastix. I never saw them in the mid-gut, and 
my infected material was too limited to allow of complete working out 
of the life-cycle. 
The parasites were mostly in the rounding-off and semi-encysted 
condition, but a few were still typical crithidian flagellates (PI. Ill, 
figs. 4 and 5). Ldger and Duboscq (1909) have given a clear and 
concise description of Crithidia campanulata as found in Ptychoptera. 
My parasite does not differ from theirs in any important feature. The 
larger flagellates are about 12 g long by 2’5 g broad: smaller individuals 
measure only 5 g x '75 g. The flagellum projects for some 6—10 g, and 
is continued on to the body along the undulating membrane. It takes 
its origin in a minute basal granule, lying in front of the rod-shaped 
kineto-nucleus. The kineto-nucleus is pressed up against the anterior 
