THE FAUNA OF THE LAKE WINNEBAGO REGION* 
A Quantitative and Qualitative Survey with Special 
Reference to the Mollusca 
Frank Collins Baker 
During the summer of 1920 (July and August) a somewhat de¬ 
tailed survey was made of the Lake Winnebago region, including 
Lake Winnebago, Lake Butte des Morts, the Fox River at Omro, 
and the small swales and pools bordering the shores of these places. 
The work was carried on under the auspices of the Wisconsin 
Geological and Natural History Survey, by which the writer was 
commissioned to make a survey of the molluscan fauna of the State 
preparatory to the completion of a monograph of the Mollusca. 
The absence of any literature, excepting scattered records, con¬ 
cerning the mollusk fauna of the Winnebago region led to its se¬ 
lection as a profitable area for statistical study for comparison 
with other lakes which have been similarly treated. 
Headquarters were established at the Wisconsin State Fish 
Hatchery at Oshkosh, where motor and row boats were placed at 
the writer’s disposal, as well as suitable laboratory facilities for 
sorting and otherwise caring for the collections. Collections were 
made at definite stations along the west shore of Winnebago Lake 
from Asylum Bay to Long Point Island, a distance of about 12 
miles. Shore material was also gathered at other places on the lake 
shore. In Lake Butte des Morts, collections were made at places 
covering the greater part of this body of water. Over 450 dredg¬ 
ings were made and, in addition, mollusks were collected from many 
places along the shore and in inland habitats. The dredgings were 
made with an Ekman bottom sampler. The results shown in the 
tables indicate the number of individuals per square meter of 
bottom. 
The material upon which the study is based is preserved in the 
Zoological Museum of the University of Wisconsin (Mollusca) and 
Contribution from the Museum of Natural History, University of Illinois, No. 32. 
