424 The Protozoa of Sandusky Bay and Vicinity. 
The lake itself while furnishing a large number of Crustacea has 
given, at least near the shore, a very small number of Protozoa, 
even though they do occur with such frequency in the coves 
mentioned. A great majority of the species of Protozoa, in this 
region at least, can be found in localities where duck-weed 
thrives abundantly. Almost any condition of temperature, light, 
or varying amounts of vegetation will furnish a good Protozoan 
fauna, especially of Mastigophora and Infusoria and Suctoria 
if the common duck-weed, Lemna minor, can be found in abund- 
ance. 
The collections are confined to Sandusky Bay and vicinity 
with the exception of a few species from a small pond in 
Columbus, and a few Rhizopods from sphagnum taken from 
Licking Reservoir. 
The work was done during the summers of 1902, 1903, and 
1904. The original plan involved a study of the seasonal dis- 
tribution of the Protozoa in this region, but owing to the fact 
that work was confined each year to the months of June, July 
and August no serious study of the seasonal distribution could 
be made. This has not been attempted since 1881-2, when C. M. 
Vorce made such a study in the vicinity of Cleveland. 
A great majority of the species catalogued are found in 
three localities. A brief description of the topography of San- 
dusky Bay will make this clear. Sandusky Bay is a shallow, 
almost land-locked harbor averaging about twelve feet in depth, 
some fourteen or fifteen miles in length, with a width of some- 
thing like two miles. The portion of the Bay lying next to the 
main land contains numerous marshes and a number of sluggish 
streams enter it. The shore of the Bay lying toward the north 
is separated from the lake by a long sand spit known as Cedar 
Point, which throughout the greater portion has a sandy shore. 
At the western portion of Cedar Point there is a large marsh 
known as Biemiller’s Cove. This marsh, with a well-defined 
channel kept open by the rise and fali of the lake due to the 
action of the wind, has an average depth of about three feet. It 
is a typical marsh with dense vegetation along the shore, a good 
deal of decaying vegetation in the bottom. On the southern side 
of the Bay near the city is the cove which I have designated as 
