496 
THOMPSON Lake, AuG. 12—20, 1914. Borrom Fauna 
8 CoLLEcTIONS,* DEPTH, 7 To 9 FT. 
(No vegetation; all mud bottom) 
Number per square yard 
Pounds per acre 
Campeloma subsolidum 21.3 63.9 
Lioplax subcarinatus 10.5 31.8 12.6 76.5 
Valvata spp. 470.6 25.8 
Musculium transversum 208.3 936.1 104.0 140.0 
Pisidium sp. 257.2 10.2 
Small Oligochaeta 4.0 na | 0.1 
Small leeches 23.5 3.9 
Chironomid larvae (large spp.) 123.7 82.4 
212.0 94.2 
Chironomid larvae (small spp.) 46.7 6.5 
Palpomyia larvae SHlb 0.2 
Caddis larvae 11.0 11 
Total 1179.9 310.7 
* All above ‘“‘cut-road.” 
THompson Lake, Auc. 12—20, 1914. Borrom Fauna 
10 CoLLections,* DreptH, 1 To 6 Fr. No VEGETATION 
(Hight collections, mud bottom; two collections, sandy) 
Number per square yard| Pounds per acre 
Campeloma subsolidum 83.0 249.0 - 
Lioplax subcarinatus 63.0 218.5 75.6 687.1 
ivipara contectoides 72.5 362.5 
Amnicola limosa 40.0 2.2 
A. emarginata 31,0 1.1 
Valvata spp. 362.0 954.5 19.9 80.3 
Musculium transversum 79.0 39.5 
Pisidium sp. 442.5 17.6 
Small Oligochaeta 10.0 0.3 
Small leeches 72.0 12.2 
295.0 135.8 
Chironomid larvae (large spp.) 180.0 120.0 
Caddis larvae 33.0 3.3 
Total 1468 903.2 
* All north of “‘cut-road.” 
