481 
4 CoLLecTions, 4- To 7-FT. ZoNE, JuLyY 26—27, 1915 
Lower LAKE, Opposite EAGLE Packet LANDING 
Number per square yard | Pounds per acre 
Campeloma subsolidum 18.5 55.5 
Lioplax subcarinatus 27.5 33.0 
153.0 446.3 
Vivipara contectoides 60.5 302.0 
Pleurocera sp. 46.5 55.8 
Amnicola emarginata aly eo) 0.9 
Valvata spp. 53.0 26.5 : 
Musculium transversum 37.0 167.5 25.9 55.5 
Sphaerium stamineum 20.0 0.8 
Pisidium species 40.0 1.4 
Leeches (small spp.) 22.5 3.8 
52.5 5.8 
Asellus sp. 15.0 1.4 
Hyalella knickerbockeri 15.0 0.6 
Total 373.0 507.6 
1 CoLLecTION, 1- To 3-FT. ZonE, Juny 28, 1915 
Lower LAKE, OPPOSITE EAGLE PACKET LANDING 
Number per square yard| Pounds per acre 
| 
Vivipara contectoides 30 150.0 
50 174.0 
Pleurocera sp. 20 24.0 
Planorbis trivolvis 10 7.0 
Pisidium sp. 30 70 1.2 9.8 
Valvata spp. 30 1.6 
Hyalella knickerbockeri 100 4.0 
120 “74 
Leeches (small spp.) 20 3.4 
Total 240 191.2 
