429 
I. Deep Bottom-land Type. (1—6-ft. Zone. Vegetation) 
Clear—Mud, 1915 12 121.7 | 110.7 | ey, | 250.1 93 
Liverpool, 1915 9 117.0 4.2 28.2 | 149.4 85 
Thompson, 1914 16 210.0 28.4 193.1 | 431.5 55 
Thompson, 1915 12 481.9 10.0 20.4 512.4 95 
Dogfish, 1914 | a 336.0 19.1 42.4 397.5 89 
Dogfish, 1915, | 3 | none 7.3 [2259 134.2 | 5 
Average 57 | 233.9 36.1 77.0 347 717.8 % 
ILLINOIS VALLEY LAKes, 1914—1915, Borrom Fauna 
: POUNDS PER ACRE 
II. Deep, Sand-Beach Type. (Zone over 6 feet) 
No. col- Eanes : 
Lake 1 ti Viviparidae | Sphaeriidae |Insects | Total | Per cent. 
ass ete. ete. ete. Mollusca 
Quiver, 1914 15 2,754.6 2.9 47.5 | 2,805.0] 98 
Quiver, 1915 3 800.0 none 3.1 803.1} 99 
1 
Matanzas, 1915 4) none 40.6 18.0 58.6] 69 
Average 27 1,619.2 15.1 32.7 1.667 96.8% 
II. Deep, Sand-Beach Type. (1—6-ft. Zone. Vegetation) 
Quiver, 1914 aly 329.7 33.4 25.2 388.3 | 93 
Quiver, 1915 | 14 35.5 9.3 113.9 158.7 | 28 
Matanzas, 1915 | 6 | 58.4 9.6 Ss) 77.9 87 
Average | 37 | 174.3 20.4 56.2 251 17.5% 
