1995] NOTES ON FRESH-WATER RHIZOPODS. 19 
thus an indispensible factor in the economy of the organic life of 
fresh-water fishes.” 
These notes were made from work done only during winter 
months; from material collected before cold weather, preserved as 
before described. If work were done in summer when material 
is abundant everywhere, doubtless all the species, described by 
Dr. Leidy in his work on Rizopods, could be identified; and proba- 
bly many new species added to it. This work opens up a fertile 
field for investigation to any one interested in microscopy. 
The appended list is from species found at Ottawa: the class- 
ification that adopted by Dr Leidy. 
RHIZOPODA. 
HELIOZOA 
Actinophrys 
Sol, Ehr. 
Actinosphzrium 
Eichornii, (Ehr.) Stein. 
Clathrulina 
elegans, Cienk. 
Raphidiophrys 
elegans, Hert & Less. 
FILOSA. 
PROTOPLASTA 
Assulina 
seminulua, (Ehr.) Leidy. 
Cyphoderia 
ampulla, (Ehr.) Leidy. 
Euglypha 
alveolata, Duj. 
brachiata, Leidy. 
ciliata, (Ehr.) Leidy. 
cristata, Leidy. 
mucronata, Leidy. 
Placocysta 
spinosa, (Carter) Leidy. 
Sphenoderia 
lenta, Schlumb. 
Trinema 
enchelys, (Ehr.) Leidy. 
