486 Wisconsin Academy of Sciences, Arts, and Letters. 
Table 1. Results obtained for Limnodrilus and Tubifex at the five 
deep-water stations. The figures for maximum, minimum, and mean indi¬ 
cate the member of individuals of these two forms per square meter of\ 
bottom. 
Station 
Depth, 
Meters 
Number 
of 
Samples 
Number of Individuals per Square 
Meter of Bottom 
Maximum 
Minimum 
Mean 
Station n . 
23.5 
71 
11,410 
528 
3,000 
Maple Bluff . 
21 
32 
6,035 
717 
2,700 
Center .. 
22 
44 
7,660 
422 
3,125 
North of Second Point.. 
21 
31 
10,340 
1,315 
4,500 
West Bay . 
20.5 
35 
13,335 
1,160 
4,630 
Table 2. The number of Limnodrilus and Tubifex per square meter 
during the different months of the year. The' numbers represent the 
monthly averages for the five stations in deep water combined. 
Table 3. The average weight of Limnodrilus and Tubifex stated in 
milligrams per individual, together with the percentages of watdr and of 
ash in them. The results for the ash are given in percentages of the dry 
weight. 
Date 
Number 
Weighed 
Live 
Weight 
Dry Weight 
Percentage 
of Water 
Percentage 
o f As h 
June 28, 1017. 
215 
1.56 
0.3204 
70.5 
4.34 
August 20, 1017. 
160 
1.83 
0.2725 
85.1 
4.04 
Matt 93 101R 
300 
0.3705 
4.80 
August 15, 1010. 
175 
1.58 
0.2733 
82.7 
3.80 
Mean. 
1.65 
0.3110 
82.4 
4.25 
