450 The Protozoa of Sandusky. Bay and Vicinity. 
Class Infusoria — Continued. 
Opercularia nutans Ehr.; on roots of Lem- 
na from college run, Columbus; on 
duckweed roots at Sandusky. 
Opercularia humilis Kell.; on the leech 
Clepsine from Biemiller’s cove. 
Opercularia lichtensteinii Stein; on duck- 
weed roots from Biemiller’s cove. 
Opercularia berberina Linn.; attached 
to dragon fly larva from Biemiller’s 
cove, rare. 
Opercularia articulata Ehr.; on willow 
roots from cove at ice house. 
Opercularia stenostoma Stein; on willow 
roots from college lake, Columbus; 
on gills of cray fish from creek at In- 
firmary. 
Opercularia elongata Kell.; on duckweed 
roots from Biemiller’s cove. 
Opercularia rugosa Kell.; on duckweed 
roots, Biemiller’s cove. 
Genus Thuricolopsis Stokes 
Thuricolopsis kellicottiana Stokes; at- 
tached to algae and willow roots 
from basket factory cove. 
Thuricolopsis innixa Stokes; on willow 
roots from college lake, Columbus. 
Genus Cothurnia C. & L. 
Cothurnia annulata Stokes; among algae 
from Biemiller’s cove. 
Cothurnia imberbis Ehr.; attached to 
algae from the willow roots from col- 
lege lake (east), Columbus. 
Cothurnia elongata From.; attached to 
algae and willow roots from Biemil- 
miller’s cove. 
Cothurnia spissa From.; on duckweed 
roots from basket factory cove; in 
college lake, Columbus. 
