DETAILED VALUATION TABLES 
I. Bottom Fauna, Illinois River, 1915 
1. CHILLICOTHE TO Foot or Preorta LAKE 
8 CHANNEL COLLECTIONS, JuLY 26—27 anp Aue. 19 
CHILLICOTHE TO Opposite MOossvVILLE 
Number per square yard 
Pounds per acre 
Campeloma subsolidum Li 51.9 
Lioplax subcarinatus 39.7 47.6 
88.2 244.1 
Vivipara contectoides 28.2 141.0 
Pleurocera sp. 3.0 3.6 
Amnicola emarginata 2.5 trace 
Ancylus sp. 0.7 trace 
Physa sp. 2.5 0.5 
143.7 70.4 
Pisidium sp. 5 trace 
Musculium transversum 135.3 67.5 
Young Unionidae 1.2 2.4 
Asellus sp. 0.2 trace 
Small Oligochaeta 8.1 0.2 
Leeches (small spp.) 14.3 2.4 
26.6 3.1 
Caddis larvae (small spp.) 0.2 trace 
Chironomid larvae (smaller spp.) 3.7 0.5 
Chironomid larvae (larger spp.) 0.1 trace 
Total 258.5 317.6 
