The Protozoa of Sandusky Bay and Vicinity. 
F. L. LANDACRE. 
The collection of fresh-water Protozoa of Sandusky Bay 
exclusive of the Sporozoa was begun as a preliminary survey 
of the Protozoan fauna of that region. The faunal work was 
meant to precede a more extended study of the Protozoa with 
a view to determining the life history and relationships of many 
doubtful forms, and their value as a food supply of fresh-water 
fishes. | 
No attempt has been made to describe new species in the 
present paper although many have been found which are appar- 
ently new. The large number of intermediate forms found prob- 
ably indicate a greater degree of variability of known species 
rather than a large number of new forms. 
The region about Sandusky seemed to be paticularly favor- 
able for a large Protozoan fauna and the work there has shown 
this to be true. It is particularly rich in Infusoria and Mastigo- 
phora, but contains a smaller representation of Sarcodina than 
one would be led to expect. The region is poorest perhaps in 
Rhizopods. This is due probably to the fact that the swamps 
there contain no sphagnum. 
When the collections were first begun it seemed probable 
that the plankton of Sandusky Bay and the Lake would be par- 
ticularly rich. This expectation, however, has not been fulfilled 
but the marshes and stagnant pools, on the other hand, have 
been found to be unusually rich. Owing to the peculiar condi- 
tions present in Sandusky Bay the attempt to study the vertical 
distribution was not productive of good results. Neither is the 
study of the surface towings at all satisfactory. The work was 
begun with the expectation that faunal regions could be mapped 
out, but the results here are also largely negative. 
The probable reason that the plankton of Sandusky Bay is 
small both in quantity and number of species, is, that the water is 
shallow; this causes an unusual amount of sediment in the 
ti water when agitated by the wind. Sandusky Bay is rarely clear. 
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