14 THE CHICAGO ACADEMY OF SCIENCES. 
the country is a vast prairie upon which no mollusks are to be 
found. The whole length of the Desplaines River is good terri- 
tory for this class of animals. 
BowMaNVILLE.—This is one of the best localities in the 
entire area. It is situated seven miles northwest of Chicago 
near the north branch of the Chicago River, in Jefferson Town- 
ship. The region is well wooded with a forest of large trees, 
and the ground is strewn with dead leaves and fallen logs and 
sticks. The forest occupies two hillsides sloping to meet a 
small stream, which empties into the north branch of the Chicago 
River. An old wooden bridge which crosses this stream is the 
best single locality. No less than ten species have been col- 
lected beneath this bridge within a radius of eight feet. The 
soil in the woods at this locality is moist and generally covered 
with a thick mould in which the mollusks love to bury them- 
selves. Twenty-five species have been recorded from this very 
prolific habitat and more will probably be found when the 
ground is more carefully explored. 
Wo.tr, Hype, CALUMET, GEORGE AND BERRY LAKEs.—This 
chain of lakes lies partly in Lake County, Ind., and partly in 
Cook County, Ill., principally in Hyde Park Township. They 
are from twelve to eighteen miles from Chicago in a south- 
easterly direction. The shores about these lakes are generally 
bare of woodlands, although a small patch of woods occurs here 
and there which yields an abundant supply of mollusks. These 
woodlands are moist and, as usual, carpeted with a layer of 
mould covered with logs. The shores of the lakes are sandy or 
muddy and are shallow; in fact one may wade across them 
in many places. The northern portions of these lakes are 
the best for collecting purposes. At Roby there is a little ditch 
by the electric car line in which a number of species of Limnzids 
flourish. 
Of the lakes just mentioned, Berry is now thoroughly spoiled 
as a collecting locality on account of the Standard Oil Works, 
and by being partly filled up and drained. The timber has also 
been cut from its shores. This last statement is also true of 
Hyde and George lakes, the different railroads making embank- 
ments through them and cutting the lakes into ditches. Wolf 
and Calumet lakes are now the only bodies of water left in which 
good collecting may be done. 
Jo.tier.—This very prolific locality is situated thirty-three 
miles from Chicago, on the Desplaines River, in Joliet Township, 
