477 
Beneath the trees the vegetation consists of bushes and ground 
plants, among which the following are conspicuous: 
Sium cicutefolium. Hemlock Water-Parsnip. 
Rudbeckia laciniata. Green-headed Coneflower. 
Cicuta maculata. Water Hemlock. 
Campanula americana. Tall Bellflower. 
Trillium sp. Wake-robin. 
Artsema triphyllum. Jack-in-the-pulpit. 
Viola palmata. Early Blue Violet. 
A small brook flows through this forest, and empties into the 
East Branch of the Chicago River. The banks of the brook are 
low, from six inches to a foot above the water, and are thickly lined 
with low-growing plants and flowers. 
Lymnea caperata is apparently the only mollusk which inhabits 
this brook. 
STATION X XVII. 
Small pools in depressions caused by heavy rains. These pools 
overflow into the brook mentioned under Station XXVI. The only 
life observed in these pools was a mollusk (A plexa hypnorum) and a 
leech. The mollusks were observed crawling over the dead leaves 
on the bottom of the pool or swimming, shell downward, on the 
surface of the water. The leech was found on the surface of the 
leaves. 
STATION XXVIII. 
(Plate X XI.) 
The whole area of Station X XVI is covered with old stumps and 
logs, all half rotten, with the bark ‘“‘started’’ and on many logs 
partly peeled off. There is also an abundance of the usual forest 
debris of small sticks, leaf mold, fallen trees, etc. In the spring 
these half-decayed relics are partly hidden by the long grass, vines 
and flowers which abound in this area. The logs and stumps are 
further ornamented by huge fungus growths. Life is very abundant 
in this station. The following species were noted. 
MOLLUSKS. 
Pyramidula alternata. \ Found under old logs and crawling 
Polygyra thyrotdes. J over the surface of the ground. 
