Baker—Molluscan Fauna of Tomahawk Lake, Wisconsin . 221 
Species living in river with swift current. 
Lampsilis ventricosa. 
Lampsilis luteola. 
Lampsilis ligamentina. 
Lampsilis recta. 
Quadrula undulata. 
Bphcerium striatinum. 
Pisidium virginicum. 
Campeloma decisum. 
Species living in creek with sandy bottom and clear, cold 
water; current swift. 
Lampsilis ventricosa. 
Lampsilis luteola. 
Lampsilis ligamentina. 
Strophitus edentulus. 
Anodonta marginata. 
Anodonta implicata. 
Anodonta grandis footiana. 
Symphynota costata. 
Symphynota compressa. 
Campeloma decisum. 
These tables may be further analyzed as follows: 
Peculiar 
Total to this 
number, habitat. 
1. Open shore .. 12 4 
2. Enclosed or sheltered bays.. 9 
3. Castalia—Nymphaea society . 8 
4. Swampy ponds . 18 15 
5. Swales' . 5 2 
6. Swift current of river. 7 4 
7. Swift current of creek. 10 4 
It will be seen that number four (swampy ponds) produces 
the greatest number of species (18) as well as the greatest num¬ 
ber of peculiar forms (15). The open shore produces twelve 
species with but four peculiar. A number of species also live 
in several of the habitats. 
Anodonta marginata in 1, 2, 7. 
Anodonta grandis footiana in 1, 2, 7. 
