500 
TuHompson LAKE,* Ava. 28, 1915. Borrom Fauna 
5 CoLuections, DerrH, 2 To 6 Fr. ALL IN VEGETATION 
Number per square yard; Pounds per acre 
Vivipara -contectoides 157 785.0 
Pisidium sp. 12 0.4 
Small leeches 169 28.7 
Total 338 814.1 
* Woot of lake, below ‘‘cut-road.” 
TuHompson LAKE, Auc. 28, 1915. Botrom Fauna 
4 SANDAND-MtpD Borrom COLLECTIONS,* DrprH, 1 To 6 FT. 
(All in vegetation) 
Number per square yard| Pounds per acre 
Campeloma subsolidum : 31.5 94.5 
Vivipara contectoides 54.0 96.2 270.0 377.3 
Lioplax subcarinatus 10.7 12.8 
Valvata spp. 118.7 6.5 
Amnicola limosa 50.0 2.7 
243.9 14.6 
Musculium transversum 5.2 2.6 
Pisidium sp. 70.0 2.8 
Small leeches 57.5 9.7 
Planarians 7.5 0.2 
83.2 19.9 
Chironomid larvae (large spp.) 14.5 9.7 
Caddis larvae 3.7 0.3 
Total 423.3 411.8 
* All above “cut-road.” These four collections, averaged separately here, 
are also included in a preceding table. 
