222 Wisconsin Academy of Sciences, Arts, and Letters. 
Lampsilis luteola in 1, 6, 7. 
Lampsilis ventricosa in 6, 7. 
Lampsilis ligamentina in 6, 7. 
Campeloma decisum in 1, 6, 7. 
Physa ancillaria warreniana in 1, 2, 3. 
Planorbis campanulatus rudentis in 1, 2, 3. 
Planorbis bicarinatus striatus in 1, 2. 
Planorbis binneyi in 1 2, 4. 
Planorbis parvus in 3, 5. 
Ancylus parallelus in 3, 4, 5. 
Lymnoea stagnalis lillianoe in 1, 2. 
Ijymncea lanceata in 2, 4. 
Lymnoea columella in 3, 4. 
The largest number of species was produced by Stations III 
and XXII, each having ten. These stations are respectively 
the open shore and the cold, clear creek. 6, 7 and 8 species were 
common in several stations. It is of interest to note that though 
fifty-three species were secured from the entire area, yet the 
largest number of species from any one area was ten, a few pro¬ 
duced six and seven, and while the majority were less than five, 
the average for the twenty-three stations was about six. This 
low average is indicative of a wide range of habitat variation, a 
condition which has already been seen to exist in this area. 
