DocrisH Lakr, AuG. 31, 1915. 
502 
Bottom Fauna 
12 Coxttections, Derru, 7.5 To §.5 rr. No VEGETATION 
Number per square yard 
Pounds per acre 
Vivipara contectoides 10.6 53.0 
Lioplax subcarinatus 5.0 18.3 6.0 67.1 
Campeloma subsolidum 2.7 8.1 
Musculium transversum 10.5 5.2 
Pisidium sp. 74.5 2.9 
Valvata spp. 165.3 9.0 
290.5 18.5 
Amnicola emarginata 37.5 1.3 
Planorbis (small sp.) 1.6 0.1 
Physa (small sp.) 1.1 trace 
Leeches (small spp.) 38.8 6.5 
Chironomid larvae (large spp.) 88.0 58.9 
155.0 66.4 
Small Oligochaeta 11.6 0.4 
Hyalella knickerbockeri 16.6 0.6 
Total 463.8 152.0 
Doerisu LAaxe, Aue. 31, 1915. 
3 COLLECTIONS, DEPTH, 1 To 6 FT. 
Borrom Fauna 
Very LITTLE VEGETATION 
Number per square yard 
Pisidium sp. 33.3 
Valvata spp. 66.6 166.5 
Amnicola emarginata 66.6 
Leeches (small spp.) 50.0 
Chironomid larvae (large =o ) 176.6 243.2 
Small Oligochaeta 16.6 
Total 409.7 
Pounds per acre 
7.3 
126.9 
