34 
Protozoa in Triclioptera 
The amoebae moved about rather slowly. On one occasion they 
showed after some time a tendency to round off and become motionless: 
I was then able to detect in one or two cases a delicate cyst-wall 
(Text-fig. 5). Though watched for a long time after that, the amoebae 
showed no further signs of development. I saw no division stages. 
Text-figs. 2, 3 and 4. Drawings of living Entamoeba from hind-gut of caddis-worm, 
showing the lobose pseudopodia. 
Text-fig. 5. The same, encysted. 
Systematic position. The scanty nature of my observations on this 
form makes it impossible to define a new species. From the rare 
occurrence of the parasites, and the very slight degree of the infection, 
I am inclined to suppose that the true host is some other animal, and 
that their presence in the trichopterid larvae was due to the swallowing 
of a few chance cysts, which in rare instances have found a suitable field 
for development. At first I suspected that I might be dealing with 
Amoeba chironomi, Porter, the different form of the pseudopodia being 
called forth by a slightly different medium. Amoeba chironomi, 
however, is characterized by the possession of a contractile vacuole, an 
unusual feature in a parasitic amoeba, and one not exhibited by the 
amoeba in question. 
The development of a cyst-wall precludes the possibility of confusion 
with leucocytes. 
{d) Gurleya Ugeri, Hesse. 
This microsporidian infests the fat-body of the larval caddis-fly. 
I found it only three times, though I dissected fully two hundred larvae. 
This is in accordance with the observations of Hesse (1902), who 
describes it as occurring in the fat-body of only 4°/o of the larvae of 
Ephemerella ignita. I think it possible, however, that, as I was 
primarily interested in the intestinal parasites of my caddis-worms, 
I may often have overlooked the early stages of the microsporidian in 
the fat-body. The infected larvae were all found in the late summer of 
