497 
TuHompson LAKE, AuG. 12—20, 1914. 
Borrom Fauna 
12 CoLtectTions,* DertH, 1 To 6 Fr. ALL IN VEGETATION 
(Eleven collections, mud bottom; one collection, sandy) 
Number per square yard; Pounds per acre 
Campeloma subsolidum 28.7 86.1 
Lioplax subcarinatus 2.0 69.0 2.4 280.0 
Vivipara contectoides 38.3 191.5 
Amnicola limosa 0.8 trace 
Valvata spp. 69.5 3.8 
171.5 37.9 
Musculium transversum 65.4 32.7 
Pisidium sp. 35.8 1.4 
Small leeches 9.5 1.6 
Planarians 2.5 trace 
Chironomid larvae (large spp.) 268.0 179.5 
311.2 183.5 
Chironomid larvae (small spp.) 2.5 0.3 
Caddis larvae 17.5 1.7 
Caenis nymphs 0.8 trace 
Hyalella knickerbockeri 10.4 0.4 
Total 551.7 501.4 
* All north of ‘‘cut-road.” 
TuHompson Lakn,* Aue 12—20, 1914. 
4 CoLttectTions, DreprH, 2 To 4 FT. 
Bortrom FAUNA 
ALL IN VEGETATION 
Chironomid larvae (large spp.) 
Small oligochaetes 
Total 
Number per square yard 
Pounds per acre 
330 221.1 
30 ileal 
| 360 222.2 
* Foot of lake, below “cut-road.” 
