CLADOCERA OF DES MOINES AND VICINITY. 
BY B. O. GAMMON. 
This investigation was begun in April, 1901 and collections were made 
at various intervals during that spring. During the summer of 1901 
eight or nine weeks were spent in collecting and identifying specimens. 
Again in the summer of 1902 the work was taken up for about five weeks 
and during the early part of the summer of 1903 further collections were 
made. At odd times during all this period new specimens have been 
• noted as they were found in material collected for work in the Drake 
Zoological Laboratories. 
Collections of more or less richness have been made from the follow- 
ing bodies of water: 
Zoo Lake. 
South Park Pond. 
Pools near North Sixth Ave. Bridge. 
Pools near Belt Line Car Bridge. 
Flood Ponds at East Tenth and Vine Streets. 
Forty-second street sloughs. 
Wavelapd Park pond. 
Old Fair Ground Lake. 
Nourse’s Slough. 
Slough at Fortieth and Kingman Avenue. 
Slough near Camp Douglas. 
Casey’s Lake. 
Sherman’s Lake. 
In naming these collection grounds the commonly accepted name has 
been used in all cases where it is known to the writer, otherwise a name 
has been applied explanatory of the location. 
Zoo Lake from which the greatest number of collections were taken, 
is a horse-shoe shaped body of water located about a half mile north and 
a little west of Sixth Avenue bridge. Nearly all collections were taken 
from the east arm which is deepest and largest. The depth is said to be 
from twenty to twenty-five feet near the center but all collections were 
made from shore in water not exceeding six to eight feet in depth. 
Myriophyllum abounds along the entire shore and other aquatic plants 
are quite common; the water is clear over a muddy bottom. Shore line 
shaded except at north and south ends. Water always fresh, coming 
from springs. Buffalo fish are reported quite plentiful and small mud cat- 
fish and other small fishes are frequently caught. During extremely 
high water the Des. Moines River is in communication with Zoo Lake 
and during the floods of July 1902 and May 1903 quite a strong current 
( 267 ) 
