142 
College of Forestry 
The table is instructive, indicating that 22 species have 
been observed to live upon certain plants. 
In three in- 
stances, 8 species have been observed to use one species of 
plant for rest or food. 
Five species have been seen to eat 
green filamentous alge and 6 species were observed to eat 
dead vegetable matter. 
These observations are too few for 
generalizations but are suggestive for future work. 
Ik: 
Species Livine on Microscopic Puants, Derritus, 
Ere. 
1. Species living on stones and boulders. 
Galba catascopium, very common. 
Galba emarginata, rare. 
Goniobasis livescens, very common. 
Planorbis antrosus, rare. 
Planorbis campanulatus, common. 
Planorbis binneyi, common. 
2 
Planorbis campanulatus, not com- 
mon. 
Galba catascopium, rare. 
Gillia altilis, common. 
Physa ancillaria warreniana, com- 
mon. 
Physa integra, common. 
Lymnea stagnalis lilliane, com- 
mon. 
Ancylus tardus, common. 
2. Species living on sandy shore, not burrowing in sand. 
Somatogyrus subglobosus, common. 
Amnicola lustrica, common. 
Amnicola limosa, common. 
3. Species living on a sandy bottom, burrowing in sand. 
Elliptio complanatus, common. 
Lampsilis radiata, common. 
Anodonta cataracta, common. 
Anodonta grandis footiana, 
common. 
Musculium securis, common. 
Musculium rosaceum, rare. 
Spherium vermontanum, common. 
Sphervum striatinum, rare. 
Pisidium compressum, common. 
not 
Pisidium compressum. levigatum, 
common. 
Pisidium variabile, common. 
Pisidium cequilaterale, rare. 
Pisidium ferrugineum, rare. 
Pisidium henslowanum, common. 
Campeloma integrum, common. 
Campeloma decisum, common. 
Vivipara contectoides, common. 
4, Species living on gravelly or bouldery shore, burrowing 
in the sand between the stones. 
Elliptio complanatus, very com- 
mon. 
Lampsilis radiata, very common. 
Lampsilis luteola, very common. 
Lampsilis borealis, very common. 
Lampsilis iris, rare. 
Anodonta cataracta, very common. 
Anodonta implicata, very common. 
Anodonta marginata, rare. 
Anodonta grandis jootiana, rare. 
Margaritana margaritifera, 
common. 
Strophitus undulatus, rare. 
Spharium vermontanum, not com- 
mon. 
not 
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