514. 
Foor or THompson LAKE, EAst Sipe, AuG. 14, 1914, 1n CeraropHyLLum, 
SMARTWEED, AND ALGAE 
WEED FAUNA, UPPER 9 INCHES (Derr, 2.5 Fr.) 
No. per sq. yard 
Pounds per acre 
Physa (small spp.) 6,000 335.0 
Planorbis (small spp.) 240 13.2 
Planorbis trivolvis 600 420.0 991.4 
Valvata spp. 2,400 132.0 
Ananicola limosa 2,400 91.2 
Pelocoris femoratus 240 228.0 
Small libellulid nymphs 1,200 600.0 
Agrionid nymphs 600 300.0 
1,314.0 
Caenis sp. (nymphs) 1,200 96.0 
Small green chironomid larvae 600 42.0 
Hyalella knickerbockeri 1,200 48.0 
Total 16,680 2,305.4 
MiIppie oF FLAG LAKE, Oct. 6, 1914, IN PorAMOGETON, CERATOPHYLLUM, AND ALGAE 
Weep Fauna, Upper 9 INcHES (DEPTH, 4 FT.) 
No. per sq. yard Pounds per acre 
Amnicola limosa 13,125 498.5 
Physa (small spp.) 750 41.2 560.3: 
Valvata spp. 3875 20.6 
Small libellulid nymphs 375 187.5 
Agrionid nymphs 450 225.0 
705.0 
Chironomid larvae (small spp.) 750 52.5 
Hyalella knickerbockeri 6,000 240.0 
21,825 1,265.3 
