486 
13 CoLLecTIons, 4- To 7-rT. ZonE, Juty 31 anp Ave. 4, 1915 
ONE MILE ABOVE LIVERPOOL TO HAVANA 
Number per square yard| Pounds per acre 
Campeloma subsolidum 48.8 164.4 
Lioplax subcarinatus 41.9 50.2 
120.8 319.3 
Vivipara contectoides 22.8 114.0 
Pleurocera sp. 7.3 8.7 
Planorbis trivolvis 0.4 0.2 
Musculium transversum 3496.9 3537.3 1748.5 1776.7 
Sphaerium stamineum 40.0 28.0 
Leeches (small spp.) 131.6 22.3 
Asellus sp. 38.9 172.0 3.7 26.0 
Hyalella knickerbockeri 1.5 trace 
Total 3830.1 2122.0 
6 CoLLECTIONS, 1- To 3-FT. ZONE, JuLY 31 anp Ave. 4, 1915 
One MILe ABove LIVERPOOL TO HAVANA 
Number per square yard | Pounds per acre 
Campeloma subsolidum 90.3 270.9 
Lioplax subcarinatus 19.0 22.8 
230.6 887.6 
Vivipara contectoides 118.0 590.0 
Pleurocera sp. 3.3 bY 3.9 
Planorbis trivolvis 10.6 7.4 
Musculium transversum 26.3 38.5 13.1 - 21.6 
Sphaerium stamineum 1.6 aie 
Oligochaeta (small spp.) 6.6 0.2 
Leeches (small spp.) 36.1 6.1 
81.0 10.5 
Asellus: sp. 25.0 2.4 
Chironomid larvae (small spp.) 13.3 1.8 
Total 350.1 919.7 
ee 
