484 
Bobolink; nesting. 
Meadowlark; nesting. 
Bronzed Grackle. 
Field Sparrow; nesting. 
Song Sparrow. 
Barn Swallow. 
Brown Thrasher; nesting in Crategus bush near road. 
American Robin. 
E. NORTH .BRANCH OF THE CHICAGO RIVER. 
(STATIONS XXXV, XXXVI.) 
STATION XXXV. 
Swampy, ditch-like overflow (from the river) on east side of 
railroad embankment, north of Shermerville. The water is shallow 
and stagnant for the most part. Iris versicolor was the conspicuous 
plant. 
Three species of mollusks were abundant: 
Physa gyrina. 
Planorbts trivolvis. 
Lymnea caperata. 
STATION XXXVI. 
(Plate XVIII.,2.) 
The river. No opportunity presented itself for examining the 
bed of this river for pelecypods. It is used for sewage purposes, and 
is, therefore, a difficult stream to study. 
Two species of fresh-water pulmonates were observed in abun- 
dance: 
Physa gyrina. 
Planorbts trivolvts. 
SUMMARY. 
_ A study ot the two appended tables reveals some su:teresting 
facts. In Table I (terrestrial species), Station XXVIII yields the 
largest number of species (11), and Station V follows with eight 
species. These habitats are the heavy woods where there is an 
abundance of forest debris. The Succineas are present in the ma- 
jority of stations, retusa and avara being most frequently seen. The 
