507 
Matanzas Lake, Sept. 4, 1915. Borrom Fauna 
6 CoLLEcTIONS (IN CERATOPHYLLUM AND PoTAMOGETON), DEPTH 2 TO 6 FT. 
(Some vegetation at all stations) 
—+ 
Number per square yard| Pounds per acre 
Campeloma subsolidum 5.0 15.0 
Pleurocera sp. 1.6 14.9 1.9 58.4 
Vivipara contectoides 8.3 41.5 
Musculium transversum . 10, : 75 
Pisidium sp. 48.3 66.6 1.9 9.6 
Valvata spp. 3.3 0.2 
Leech, small 13.8 2.3 
Chironomid larvae (large spp.) 2.3 1.5 
26.0 9.9 
Hexagenia, etc. (nymphs) 6.6 5.9 
Caenis nymph 3.3 * 0.2 
Total . 107.5 ites 
3. SHALLOWER, WEEDY TyPE (FLAG, SEEBS, STEWART) 
FLAG Lake, Oct. 6, 1914. Borrom Fauna 
3 CoLLecTIONS, DepTH, 4 To 5 FT. ALL IN VEGETATION 
‘Number per square yard) Pounds per acre 
Musculium transversum 6.6 | 3.3 
Pisidium sp. 93.3 ert 
Valvata spp. 276.6 443.1 15.1 25.7 
Amunicola limosa 20.0 baa b 
Physa, small sp. 46.6 | 2.5 
Leech, small sp. 33.3 5.6 
Chironomid larvae (large spp.) 33.3 22.1 
Chironomid larvae (small spp.) 110.0 186.5 15.4 45.2 
Agrionid nymph 3.3 ab 
Caddis larvae 6.6 | 0.6 
Total 
629.6 70.9 
