IOWA ACADEMY OF SCIENCES 
269 
but no collections were made in water exceeding four fe^t in depth. The 
water is clear over a muddy bottom with little littoral vegetation. It is 
the drainage basin of a considerable area of rolling, wooded, bluegraos 
upland. No shade except on the north. Occasionally turtles but no fish 
are found here. Water is fresh Only negative results were obtained 
here, Cladocera or other orders never having been found in any of the 
collections made from this pond. 
Old Fair Ground Lake is an open pond of perhaps four acres extent 
and comparatively shallow. Part of the shore is overgrown with rushes. 
Muddy bottom. Water supply from springs and naturall drainage. Few 
if any fish. Negative results. 
Nourse’s Slough is a small shallow basin surrounded by weedy marsh. 
On the north and west are clumps of trees but the east and south shores 
are open. It is located on North Twentieth street about two miles north 
of Forest avenue. Crayfish are generally abundant. Waters usually 
somewhat roiled and often quite foul. Bottom muddy. 
At Fortieth and Kingman Avenue, is a shallow slough grown full of 
cat-tail and other rushes. It is not more than one-fourth acre in extent 
and does not exceed eighteen inches in depth. Only one collection was 
made here. 
Casey’s Lake is a spring fed pond of perhaps five acres extent located 
near east Twentieth and Court avenue. It is apparently an ideal habitat 
for Entomostraca being full of grass and aquatic vegetation. The waters 
are clear above a sandy bottom with duckweed generally covering the 
entire surface. Its depth ranges to eight or ten feet. Negative results, 
as regards Cladocera attended all dredging here though a few forms 
of Copepeda and Ostracoda were usually found. 
Sherman’s Lake is a long narrow pool about a half mile south of East 
Ninth Street bridge surrounded by high banks made mainly of coal slack 
and ashes. No vegetation along shore. The results here were negative as 
regards all animal forms of the higher phylla. 
Camp Douglas Slough is a deep basin of small area about one-fourth 
mile south of Camp Douglas. It is shaded on three sides but open to the 
no'rth. Weeds and rushes abound on the banks. Frogs and crayfish are 
generally abundant and small mud cat-fish are common. Water clear 
above a muddy bottom. Hauls made at a depth of three to four feet. 
The “Birge Cone Dredge” designed by Prof. E. A. Birge of the Univer- 
sity of Wisconsin was used in making practically all of these collections. 
RICHNESS OF POOLS; LIST OF SPECIES FOUND. 
Zoo Lake : 28 visits. 
Sida crystallina 
Daphnella brachynra 
D’aplinia pulex 
Daphnia sp(?) (see notes) 
Simocephalus vetuhis 
Scaplioleberis mucronata 
Ceriodapbnia sp (?) (see notes) 
Bosmina longirostris 
Camptocercus rectirostris 
