492 
8 CoLLecTIons, 1- To 3-rT. Zonr, Aue. 10, 1915 
VALLEY Ciry To KAMPSVILLE 
Musculium transversum 
Oligochaetes, small 
Hydropsyche larvae 
Hexagenia, etc. (nymphs) 
Chironomid larvae (small spp.) 
| Number per square yard 
Pounds per acre . 
Total 
| 4.8 4.8 2.4 
3.0 0.1 
2.2 0.4 
11.4 
5.0 4.5 
1.2 0.1 
| 16.2 7.5 
2.4 
5.1 
7 CHANNEL Cotiections, Aue. 12, 22, 28, 1915 
Heap oF DiaAmMonp IsLAND TO GRAFTON 
Number per square yard 
Pounds per acre 
Musculium transversum 2.0 1.0 
2.8 
Young Unionidae 0.8 1.6 
Chironomid larvae (small spp.) 0.4 trace 
Hexagenia, etc. (nymphs) 3.0 2.7 
Hydropsyche larvae 0.5 25.5 0.1 
Gomphid nymphs 0.2 0.4 
QOligochaetes (small spp.) 21.4 0.7 
Total 28.3 6.5 
2.6 
3.9 
