478 
16 CoLLEctTions, 4- To 7-FT. ZONE, JuLy 26—27, Aue. 17—19, 1915 
CHILLICOTHE TO OpposITE MOSSVILLE 
Number per square yard| Pounds per acre 
Campeloma subsolidum 13.3 39.9 
Lioplax subcarinatus TA 8.4 
30.8 97.4 
Vivipara contectoides 9.7 48.5 
Pleurocera sp. 0.5 0.6 
Somatogyrus sp. 0.6 0.3 
Valvata spp. 4.3 0.2 
Sphaerium stamineum 0.3 0.2 
200.3 86.7 
Musculium transversum 166.0 83.0 
Musculium jayanum 3.7 2.0 
Pisidium species 25.4 1.0 
Oligochaeta (small spp.) 21.0 0.7 
Leeches (small spp.) 17.6 2.9 
Asellus sp. 0.9 trace 
Hyalella knickerbockeri 7.5 0.3 
68.7 13.3 
Chironomid larvae (small) 9.9 1.3 
Chironomid larvae (large) 5.3 6.6 
Hexagenia, etc. (nymphs) 0.6 0.5 
Caddis-fly larvae (small) 5.3 0.7 
Agrionid nymphs 0.6 0.3 
Total 299.8 197.4 
