268 
IOWA ACADEMY OF SCIENCES 
was established through the east arm. In the hoods of 1903 this current 
was so strong that collections made some three weeks after the winters 
subsided were altogether negative in results as regarded living entomos- 
traca. 
South Park pond is an oblong body of water about one and one-half 
acres in area located in South Park about" a quarter mile south of South 
Ninth Street Bridge. It was formed by throwing a dam across a ravine 
which drains quite an area of land west of South Ninth Street. Its greatest 
depth is about fifteen feet, though no hauls were made at a greater depth 
than four to five feet. Green algae cover much of the shore waters and 
aquatic plants of higher organization are fairly abundant. The waters 
are clear and fresh though over a muddy bottom which caused more or 
less dirt to be caught in the dredge at nearly every haul. Practically the 
entire shore line is shaded except at the north end. Minnows and small 
fishes are found here but no large ones. 
Sixth Avenue Bridge Pools are long narrow ponds cut off from the 
river by levees. They lie east and west of the north approach of the 
bridge and parallel to the Des Moines River with which they communi- 
cate during freshets. They are well shaded and water stands here the 
year round. Those east of the bridge are very weedy and the surface is 
usually covered with duckweed. The one west of the bridge is open and 
free from vegetation though shaded. Turtles are abundant here but no 
fish. Neither of these pools exceeds thirty feet in width though some 
of them are five or six rods long. Depth ranges to five feet, collections 
mostly at three. Waters clear. 
Belt Line Bridge Pools resemble those of the Sixth Avenue bridge but 
were much poorer collection grounds. , 
Flood Ponds at East Tenth and Vine Streets are located in the midst 
of a network of railroad enbankments, East of Ninth street and South of 
Vine street in East Des Moines. Only one of them is permanent. It is 
located between Tenth and Eleventh streets and just South of the Rock 
Island tracks. Just south of it is another semi-permanent pond from 
which some hauls were made. Each of these ponds is about three-fourths 
of an acre in extent. The depth does not exceed two and one-half to 
three feet. No vegetation is present except occasionally a little duck- 
weed and green algae. The waters are clear, bottom muddy. The w^ater 
source is overflow from Des Moines River and rain. There is no shade. 
Pish are never taken though cray-fish and turtles are sometimes seen. 
Forty-second Street Slough is a very shallow though permanent prairie 
slough located about three-fourths of a mile North of the north entrance 
to Waveland Park. It varies from one-half to one acre in extent, de- 
pending upon rainfall. The depth does not exceed two feet. Cat tails 
and other rushes abound and clover and prairie grasses border the 
slough and extend into the w^ater for several feet from shore. The water 
is clear above the v/eedy bottom. Its source is from surface drainage; 
no shade. No fish but sometimes a few frogs are found. 
Waveland Park Pond is an open pond of about one-half acre in extent, 
surrounded by grassy and weedy banks. It is located in the north central 
part of Waveland Park in a low ravine. Its depth is unknown to me 
