430 
Intuvyois VALLEY Lakes, 1914—1915, Borrom Fauna 
POUNDS PER ACRE 
III. Shallow, Weedy Type. (Depth 1—5 ft.) 
No. col- Large 
Lake lactions Viviparidae | Sphaeriidae | Insects} Total | Per cent. 
s ete. ete. ete. Mollusea 
Flag, 1914 3 none 25.7 45.2 70.9 | 63 
Flag, 1915 15 5.0 none 229) > ated | 18 
Seebs, 1914 i 14.0 15.5 94.5 124.0 | 24 
Seebs, 1915 8 18.5 1.8 5.6 25.9 | 78 
La 
Stewart, 1915 12 41.0 24.4 8.4 73.8 | 88 
Average 45 18.0 10.9 28.1 57 | 50.7% 
ILLINOIS VALLEY LAxkes, 1914—1915, Botrom Fauna 
POUNDS PER ACRE 
IV. Very Shallow, very Weedy Type. (Depth 1—4 ft.) 
Large x , 
Lake No. col- |Viviparidae |Sphaeriidae |Insects| Total | Per cent. 
lections etc. etc. ete. Mollusca 
Duck—Dennis, 1914 5 none 12.4 97.9 110.3 11 
Crane, 1915 5 42.0 14.3 22.7 79.0 71 
Average 10 21.0 13:3 60.3 94 36.4% 
V. Dead Timber and Brush Areas. (Depth 1—4 ft. Vegetation) 
Vicinity Havana, 1914 6 29.8 87.1 44.0 160.9 72 
Vicinity Havana, 1915 10 167.5 1.3 33.6 202.4 | 83 
Average | 16 115.8 33.4 37.5 187 79.7% 
