476 Wisconsin Academy of Sciences, Arts, and Letters. 
Table 5—Continued. 
Name 
Average per sq. m. at depth of 
0-lm. 
l-2m. 
2-3 m. 
3-5 m. 
5-7 m. 
P. 12 punctatus ad. 
0.22 
0.53 
0.13 
0.08 
0.95 
12.9 
0.04 
1.22 
0.57 
23.3 
Haliplus ruficollis adult. 
H. ruficollis larv... 
d.is 
Dryops lithophi lus adult. 
0.11 
Stenelmis crenatus ad. 
0.02 
0.22 
0.08 
0.34 
0.08 
0.75 
S. crenatus larva. 
0.08 
Elmis vittatus ad. 
Parnid larva (trilobiticj. 
Psephenus lecontei ad. 
P. leconteilarva.. 
0.44 
0.06 
Table 6 
Esthnates of the total number of individuals of the various 
groups of animals between the shore line and 7 meters, based on 
the averages obtained from the 50 different stations. 
Platyhelmia 
553,200,000 
Nemathelmia 
18,600,000 
Chaetopoda 
8,690,500,000 
Hirudinea 
103,200,000 
Mollusea 
2,389,700,000 
Crustacea 
2,221,300,000 
Hydrachnida 
815,900,000 
Ephemeridae 
291,300,000 
Odonata 
16,400,000 
Hemiptera 
49,300,000 
Sialidae 
12,200,000 
Trichoptera 
1,862,800,000 
Corethridae 
38,900,000 
Chironomidae . ' 
2,644,700,000 
Coleoptera 
218,400,000 
