521 
2. WEED FAuNA 
HEAD OF PISTAKEE LAKE, AUGUST 17, 1916, IN CERATOPHYLLUM 
WEED Fauna, Upper 9 IncHES (DEPTH, 3.5 FT.) 
Amnicola limosa 
Physa sp. 
No. per sq. yard 
Pounds per acre 
Small beetle 
Plea striata 
1,440 54.7 
1,920 81.1 
480 26.4 
Chironomid larvae (small spp.) ip Se 
120 58,080 84 2,330.1 
Caddis sp. (basket case) 120 12.0 
Hyalella knickerbockeri 57,000 2,280.0 
60,000 2,411.2 
NortH Sipe oF NippersiInK LAKE, Aucust 18, 1916, In POTAMOGETON AND 
CERATOPHYLLUM 
WEED Fauna, Upper 9 IncHEs, (DeptH, 3.5 FT.) 
No. per sq. yard 
Pounds per acre 
Amnicola limosa 
Physa spp. 
Total 
600 22.8 
840 36.0 
240 13.2 
Chironomid larvae (small spp.) 2,880 95.0 
22,080 863.0 
Hyalella knickerbockeri 19,200 768.0 
22,920 899. 
