bo 
BD 
College of Forestry 
Quantitative Table No. 6. 
VEGETATION DWELLERS. 
The vegetation habitats naturally divide into three well 
characterized types. 1, includes those species living on lily 
pads, and five distinct situations of this kind were studied 
quantitatively. Two species of plants are represented, 
Nymphoa and Castalia, the mollusks showing no preference. 
It is probable that a preference is shown at different times by 
some species for the upper and lower surfaces of the leaves, 
but no selection of this kind was noted, mollusks being 
Fig. 34. Diagram illustrating quantity of mollusks in one square foot 
at station XXI, habitat 2, B, sandy bottom, water 18 inches 
deep, 10 specimens present. 
1. Hlliptio complanatus (1). 5. Anodonta grandis footiana (1). 
2. Anodonta cataracta (]). 6. Alasmidonta undulata (1). 
3. Anodonta marginata (1). b. Spherium vermontanum (3). 
4. Anodonta implicata (1). D. Campeloma integrum (1). 
