499 
THompson LAKE, Aug. 28, 1915. Borrom Fauna 
7 CoLxzectTions,* DrEptH, 1 To 6 FT. 
(No vegetation; all mud bottom) . 
Number per square yard| Pounds per acre 
Campeloma subsolidum 32.7 98.1 
Lioplax subcarinatus 19.5 150.0 23.4 610.5 
Vivipara contectoides 97.8 489.0 
Valvata spp. 43.5 2.3 
Musculium transversum 30.2 15.1 
261.8 24.9 
M. jayanum : trace 
Pisidium sp. 188.1 7.5 
Small leeches 19.5 3.3 
32.9 12.2 
Chironomid larvae (large spp.) 13.4 8.9 
Total 444.7 647.6 
* All above “cut-road.” 
THompson Lakes, Aug. 28, 1915. Borrom Fauna 
7 CoLLEcTions,* DepTH, 1 To 6 FT. ALL IN VEGETATION 
(Three collections, mud bottom; four collections, sand and mud) 
Number per square yard | Pounds per acre 
Campeloma subsolidum CE Aas 117.0 
Lioplax subcarinatus 9.5 76.0 11.4 265.4 
Vivipara contectoides 27.4 137.0 
Amnicola limosa 42.8 2.3 
Valvata spp. 109.2 6.0 
Musculium transversum gb 240.6 5.7, 17.0 
Musculium jayanum trace 
Pisidium 771 3.0 
Chironomid larvae (large spp.) alley ( 7.8 
Caddis larvae P 21 0.2 
55.7 14.5 
Small leeches 37.7 6.4 
Planarians , 4.2 0.1 
Total 372.3 296.9 
* All above “cut-road.” 
